html元素转canvas并一键生成png图片(支持img图片元素)html2canvas、canvas2image

╰半夏微凉° 2022-06-01 14:09 271阅读 0赞

在做项目的时候 遇到一个需要把页面上的一些元素一键转成图片并且可以下载，在这里就做一个简单的介绍，希望可以帮到大家！！

需要引入html2canvas.js、canvas2image.js、base64.js 点击[获取资源][Link 1]

需要在header中引入 html2canvas.js、canvas2image.js、base64.js 库文件

html2image思路   需要获取的元素的节点-->点击捕获按扭-->获取节点内元素信息-->利用库文件html2canvas进行绘制-->绘制成功后点击下载按钮-->利用库文件canvas2image转换为img，使用base64对图片编码-->下载图片

![SouthEast][]

![SouthEast 1][]

![SouthEast 2][]

![SouthEast 3][]

**html代码：**

<!DOCTYPE html>
    <html lang="en">
    <head>
    	<meta charset="UTF-8">
    	<title>html元素转canvas并一键生成png图片(支持img图片元素)</title>
    	
    	<script src="js/html2canvas.min.js"></script>
    
    	
    	<script src="js/canvas2image.js"></script>
    	<script src="js/base64.js"></script>
    	<style>
    		p{
    			font-size: 15px;
    			font-family: 'Microsoft YaHei', 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'STHeiti', 'WenQuanYi Micro Hei', 'SimSun', sans-serif;
    		}
    		#content{
    			border-radius: 3px;
    		}
    		#btnSave,#Download{
    		    position: absolute;
    		    left: 180px;
    		    top: 540px;
    		    width: 78px;
    		    height: 30px;
    		    background-color: #22b4f6;
    		    color: #fff;
    		    text-align: center;
    		    border-radius: 3px;
    		    border: none;
    		}
    		#Download{
    		    margin-left: 560px;
    		}
    		.tx,.bt{
    			border: 1px solid #999;
    			width: 100px;
    			height: 20px;
    			border-radius: 3px;
    		}
    		.bt{
    			background-color: #22b4f6;
    			color: #fff;
    			text-align: center;
    			border: none;
    		}
    	</style>
    </head>
    <body>
    <div>注意：html2canvas 只能在服务器中抓取img</div>
    	<div id="content" style="width:500px;height:500px;border:1px solid #22b4f6;float:left;text-align:center; background: #fff;">
    		<p><img width="80" height="100" src="images/pic.jpg" alt="头像"></p>
    	    <p>昵称：马云云</p>
    	    <p>技能：前端 + 后端 + 小程序 + webapp</p>
    	    <p>语言：html5、php、mysql</p>
    	    <p>脚本：javascript</p>
    	    <p>框架：vue.js、smarty、thinkphp、MUI、WeUI、Bootstrap</p>
    	    <p><input type="text" class="tx" placeholder="微信公众号开发"></p>
    	    <p><input type="button" class="bt" value="网站微站开发"></p>
    	</div>
    	<div style="width:60px;height:302px;float:left;text-align:center;line-height:302px;font-size:30px;color:#22b4f6;">==></div>
    	<div id="images" style="width:190px;height:302px;float:left;text-align:center;line-height:302px">图片预览区</div>
    	<button id="btnSave">抓取图片</button><button id="Download">下载图片</button>
    </body>
    <script>
    /*生成canvas图形*/
    
    // 获取按钮id
    var btnSave = document.getElementById("btnSave");
    // 获取内容id
    var content = document.getElementById("content");
    // 进行canvas生成
    btnSave.onclick = function(){
    	html2canvas(content, {
            onrendered: function(canvas) {
            	//添加属性
            	canvas.setAttribute('id','thecanvas');
    			//读取属性值
    			// var value= canvas.getAttribute('id');
                document.getElementById('images').innerHTML = '';
                document.getElementById('images').appendChild(canvas);
            }
    	});
    }
    </script>
    <script>
    /*
     * 说明
     * 不支持跨域图片
     * 不能在浏览器插件中使用
     * 部分浏览器上不支持SVG图片
     * 不支持Flash
     */
    var Download = document.getElementById("Download");
    Download.onclick = function(){
    	var oCanvas = document.getElementById("thecanvas");
    
    	/*自动保存为png*/
    	// 获取图片资源
    	var img_data1 = Canvas2Image.saveAsPNG(oCanvas, true).getAttribute('src');
    	saveFile(img_data1, 'richer.png');
    
    
    	/*下面的为原生的保存，不带格式名*/
    	// 这将会提示用户保存PNG图片
    	// Canvas2Image.saveAsPNG(oCanvas);
    }
    // 保存文件函数
    var saveFile = function(data, filename){
        var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
        save_link.href = data;
        save_link.download = filename;
       
        var event = document.createEvent('MouseEvents');
        event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
        save_link.dispatchEvent(event);
    };
    </script>
    </html>

**html2canvas.min.js 源代码：（复制可用）**

/*
      html2canvas 0.4.1 <http://html2canvas.hertzen.com>
      Copyright (c) 2013 Niklas von Hertzen
    
      Released under MIT License
    */
    (function(t,e,n){"use strict";function r(t,e,n){var r,a=t.runtimeStyle&&t.runtimeStyle[e],o=t.style;return!/^-?[0-9]+\.?[0-9]*(?:px)?$/i.test(n)&&/^-?\d/.test(n)&&(r=o.left,a&&(t.runtimeStyle.left=t.currentStyle.left),o.left="fontSize"===e?"1em":n||0,n=o.pixelLeft+"px",o.left=r,a&&(t.runtimeStyle.left=a)),/^(thin|medium|thick)$/i.test(n)?n:Math.round(parseFloat(n))+"px"}function a(t){return parseInt(t,10)}function o(t,e,a,o){if(t=(t||"").split(","),t=t[o||0]||t[0]||"auto",t=u.Util.trimText(t).split(" "),"backgroundSize"!==a||t[0]&&!t[0].match(/cover|contain|auto/)){if(t[0]=-1===t[0].indexOf("%")?r(e,a+"X",t[0]):t[0],t[1]===n){if("backgroundSize"===a)return t[1]="auto",t;t[1]=t[0]}t[1]=-1===t[1].indexOf("%")?r(e,a+"Y",t[1]):t[1]}else;return t}function i(t,e,n,r,a,o){var i,l,s,c,d=u.Util.getCSS(e,t,a);if(1===d.length&&(c=d[0],d=[],d[0]=c,d[1]=c),-1!==(""+d[0]).indexOf("%"))s=parseFloat(d[0])/100,l=n.width*s,"backgroundSize"!==t&&(l-=(o||r).width*s);else if("backgroundSize"===t)if("auto"===d[0])l=r.width;else if(/contain|cover/.test(d[0])){var h=u.Util.resizeBounds(r.width,r.height,n.width,n.height,d[0]);l=h.width,i=h.height}else l=parseInt(d[0],10);else l=parseInt(d[0],10);return"auto"===d[1]?i=l/r.width*r.height:-1!==(""+d[1]).indexOf("%")?(s=parseFloat(d[1])/100,i=n.height*s,"backgroundSize"!==t&&(i-=(o||r).height*s)):i=parseInt(d[1],10),[l,i]}function l(t,e){var n=[];return{storage:n,width:t,height:e,clip:function(){n.push({type:"function",name:"clip",arguments:arguments})},translate:function(){n.push({type:"function",name:"translate",arguments:arguments})},fill:function(){n.push({type:"function",name:"fill",arguments:arguments})},save:function(){n.push({type:"function",name:"save",arguments:arguments})},restore:function(){n.push({type:"function",name:"restore",arguments:arguments})},fillRect:function(){n.push({type:"function",name:"fillRect",arguments:arguments})},createPattern:function(){n.push({type:"function",name:"createPattern",arguments:arguments})},drawShape:function(){var t=[];return n.push({type:"function",name:"drawShape",arguments:t}),{moveTo:function(){t.push({name:"moveTo",arguments:arguments})},lineTo:function(){t.push({name:"lineTo",arguments:arguments})},arcTo:function(){t.push({name:"arcTo",arguments:arguments})},bezierCurveTo:function(){t.push({name:"bezierCurveTo",arguments:arguments})},quadraticCurveTo:function(){t.push({name:"quadraticCurveTo",arguments:arguments})}}},drawImage:function(){n.push({type:"function",name:"drawImage",arguments:arguments})},fillText:function(){n.push({type:"function",name:"fillText",arguments:arguments})},setVariable:function(t,e){return n.push({type:"variable",name:t,arguments:e}),e}}}function s(t){return{zindex:t,children:[]}}var c,d,u={};u.Util={},u.Util.log=function(e){u.logging&&t.console&&t.console.log&&t.console.log(e)},u.Util.trimText=function(t){return function(e){return t?t.apply(e):((e||"")+"").replace(/^\s+|\s+$/g,"")}}(String.prototype.trim),u.Util.asFloat=function(t){return parseFloat(t)},function(){var t=/((rgba|rgb)$[^$]+\)(\s-?\d+px){0,})/g,e=/(-?\d+px)|(#.+)|(rgb$.+$)|(rgba$.+$)/g;u.Util.parseTextShadows=function(n){if(!n||"none"===n)return[];for(var r=n.match(t),a=[],o=0;r&&r.length>o;o++){var i=r[o].match(e);a.push({color:i[0],offsetX:i[1]?i[1].replace("px",""):0,offsetY:i[2]?i[2].replace("px",""):0,blur:i[3]?i[3].replace("px",""):0})}return a}}(),u.Util.parseBackgroundImage=function(t){var e,n,r,a,o,i,l,s,c=" \r\n	",d=[],u=0,h=0,f=function(){e&&('"'===n.substr(0,1)&&(n=n.substr(1,n.length-2)),n&&s.push(n),"-"===e.substr(0,1)&&(a=e.indexOf("-",1)+1)>0&&(r=e.substr(0,a),e=e.substr(a)),d.push({prefix:r,method:e.toLowerCase(),value:o,args:s})),s=[],e=r=n=o=""};f();for(var p=0,g=t.length;g>p;p++)if(i=t[p],!(0===u&&c.indexOf(i)>-1)){switch(i){case'"':l?l===i&&(l=null):l=i;break;case"(":if(l)break;if(0===u){u=1,o+=i;continue}h++;break;case")":if(l)break;if(1===u){if(0===h){u=0,o+=i,f();continue}h--}break;case",":if(l)break;if(0===u){f();continue}if(1===u&&0===h&&!e.match(/^url$/i)){s.push(n),n="",o+=i;continue}}o+=i,0===u?e+=i:n+=i}return f(),d},u.Util.Bounds=function(t){var e,n={};return t.getBoundingClientRect&&(e=t.getBoundingClientRect(),n.top=e.top,n.bottom=e.bottom||e.top+e.height,n.left=e.left,n.width=t.offsetWidth,n.height=t.offsetHeight),n},u.Util.OffsetBounds=function(t){var e=t.offsetParent?u.Util.OffsetBounds(t.offsetParent):{top:0,left:0};return{top:t.offsetTop+e.top,bottom:t.offsetTop+t.offsetHeight+e.top,left:t.offsetLeft+e.left,width:t.offsetWidth,height:t.offsetHeight}},u.Util.getCSS=function(t,n,r){c!==t&&(d=e.defaultView.getComputedStyle(t,null));var i=d[n];if(/^background(Size|Position)$/.test(n))return o(i,t,n,r);if(/border(Top|Bottom)(Left|Right)Radius/.test(n)){var l=i.split(" ");return 1>=l.length&&(l[1]=l[0]),l.map(a)}return i},u.Util.resizeBounds=function(t,e,n,r,a){var o,i,l=n/r,s=t/e;return a&&"auto"!==a?s>l^"contain"===a?(i=r,o=r*s):(o=n,i=n/s):(o=n,i=r),{width:o,height:i}},u.Util.BackgroundPosition=function(t,e,n,r,a){var o=i("backgroundPosition",t,e,n,r,a);return{left:o[0],top:o[1]}},u.Util.BackgroundSize=function(t,e,n,r){var a=i("backgroundSize",t,e,n,r);return{width:a[0],height:a[1]}},u.Util.Extend=function(t,e){for(var n in t)t.hasOwnProperty(n)&&(e[n]=t[n]);return e},u.Util.Children=function(t){var e;try{e=t.nodeName&&"IFRAME"===t.nodeName.toUpperCase()?t.contentDocument||t.contentWindow.document:function(t){var e=[];return null!==t&&function(t,e){var r=t.length,a=0;if("number"==typeof e.length)for(var o=e.length;o>a;a++)t[r++]=e[a];else for(;e[a]!==n;)t[r++]=e[a++];return t.length=r,t}(e,t),e}(t.childNodes)}catch(r){u.Util.log("html2canvas.Util.Children failed with exception: "+r.message),e=[]}return e},u.Util.isTransparent=function(t){return"transparent"===t||"rgba(0, 0, 0, 0)"===t},u.Util.Font=function(){var t={};return function(e,r,a){if(t[e+"-"+r]!==n)return t[e+"-"+r];var o,i,l,s=a.createElement("div"),c=a.createElement("img"),d=a.createElement("span"),u="Hidden Text";return s.style.visibility="hidden",s.style.fontFamily=e,s.style.fontSize=r,s.style.margin=0,s.style.padding=0,a.body.appendChild(s),c.src="data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=",c.width=1,c.height=1,c.style.margin=0,c.style.padding=0,c.style.verticalAlign="baseline",d.style.fontFamily=e,d.style.fontSize=r,d.style.margin=0,d.style.padding=0,d.appendChild(a.createTextNode(u)),s.appendChild(d),s.appendChild(c),o=c.offsetTop-d.offsetTop+1,s.removeChild(d),s.appendChild(a.createTextNode(u)),s.style.lineHeight="normal",c.style.verticalAlign="super",i=c.offsetTop-s.offsetTop+1,l={baseline:o,lineWidth:1,middle:i},t[e+"-"+r]=l,a.body.removeChild(s),l}}(),function(){function t(t){return function(e){try{t.addColorStop(e.stop,e.color)}catch(r){n.log(["failed to add color stop: ",r,"; tried to add: ",e])}}}var n=u.Util,r={};u.Generate=r;var a=[/^(-webkit-linear-gradient)$([a-z\s]+)([\w\d\.\s,%\($]+)\)$/,/^(-o-linear-gradient)$([a-z\s]+)([\w\d\.\s,%\($]+)\)$/,/^(-webkit-gradient)$(linear|radial),\s((?:\d{1,3}%?)\s(?:\d{1,3}%?),\s(?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\($\-]+)\)$/,/^(-moz-linear-gradient)$((?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\($]+)\)$/,/^(-webkit-radial-gradient)$((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\($]+)\)$/,/^(-moz-radial-gradient)$((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s?([a-z\-]*)([\w\d\.\s,%\($]+)\)$/,/^(-o-radial-gradient)$((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\($]+)\)$/];r.parseGradient=function(t,e){var 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n},r.Gradient=function(n,r){if(0!==r.width&&0!==r.height){var a,o,i=e.createElement("canvas"),l=i.getContext("2d");if(i.width=r.width,i.height=r.height,a=u.Generate.parseGradient(n,r))switch(a.type){case"linear":o=l.createLinearGradient(a.x0,a.y0,a.x1,a.y1),a.colorStops.forEach(t(o)),l.fillStyle=o,l.fillRect(0,0,r.width,r.height);break;case"circle":o=l.createRadialGradient(a.cx,a.cy,0,a.cx,a.cy,a.rx),a.colorStops.forEach(t(o)),l.fillStyle=o,l.fillRect(0,0,r.width,r.height);break;case"ellipse":var s=e.createElement("canvas"),c=s.getContext("2d"),d=Math.max(a.rx,a.ry),h=2*d;s.width=s.height=h,o=c.createRadialGradient(a.rx,a.ry,0,a.rx,a.ry,d),a.colorStops.forEach(t(o)),c.fillStyle=o,c.fillRect(0,0,h,h),l.fillStyle=a.colorStops[a.colorStops.length-1].color,l.fillRect(0,0,i.width,i.height),l.drawImage(s,a.cx-a.rx,a.cy-a.ry,2*a.rx,2*a.ry)}return i}},r.ListAlpha=function(t){var e,n="";do e=t%26,n=String.fromCharCode(e+64)+n,t/=26;while(26*t>26);return n},r.ListRoman=function(t){var 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V(t,e,n){"transparent"!==n&&(t.setVariable("fillStyle",n),F(t,e),t.fill(),ce+=1)}function D(t,e,n){var r,a,o=de.createElement("valuewrap"),i=["lineHeight","textAlign","fontFamily","color","fontSize","paddingLeft","paddingTop","width","height","border","borderLeftWidth","borderTopWidth"];i.forEach(function(e){try{o.style[e]=ge(t,e)}catch(n){ue.log("html2canvas: Parse: Exception caught in renderFormValue: "+n.message)}}),o.style.borderColor="black",o.style.borderStyle="solid",o.style.display="block",o.style.position="absolute",(/^(submit|reset|button|text|password)$/.test(t.type)||"SELECT"===t.nodeName)&&(o.style.lineHeight=ge(t,"height")),o.style.top=e.top+"px",o.style.left=e.left+"px",r="SELECT"===t.nodeName?(t.options[t.selectedIndex]||0).text:t.value,r||(r=t.placeholder),a=de.createTextNode(r),o.appendChild(a),pe.appendChild(o),v(t,a,n),pe.removeChild(o)}function $(t){t.drawImage.apply(t,Array.prototype.slice.call(arguments,1)),ce+=1}function G(n,r){var a=t.getComputedStyle(n,r);if(a&&a.content&&"none"!==a.content&&"-moz-alt-content"!==a.content&&"none"!==a.display){var o=a.content+"",i=o.substr(0,1);i===o.substr(o.length-1)&&i.match(/'|"/)&&(o=o.substr(1,o.length-2));var l="url"===o.substr(0,3),s=e.createElement(l?"img":"span");return s.className=me+"-before "+me+"-after",Object.keys(a).filter(W).forEach(function(t){try{s.style[t]=a[t]}catch(e){ue.log(["Tried to assign readonly property ",t,"Error:",e])}}),l?s.src=ue.parseBackgroundImage(o)[0].args[0]:s.innerHTML=o,s}}function W(e){return isNaN(t.parseInt(e,10))}function H(t,e){var n=G(t,":before"),r=G(t,":after");(n||r)&&(n&&(t.className+=" "+me+"-before",t.parentNode.insertBefore(n,t),oe(n,e,!0),t.parentNode.removeChild(n),t.className=t.className.replace(me+"-before","").trim()),r&&(t.className+=" "+me+"-after",t.appendChild(r),oe(r,e,!0),t.removeChild(r),t.className=t.className.replace(me+"-after","").trim()))}function j(t,e,n,r){var a=Math.round(r.left+n.left),o=Math.round(r.top+n.top);t.createPattern(e),t.translate(a,o),t.fill(),t.translate(-a,-o)}function q(t,e,n,r,a,o,i,l){var s=[];s.push(["line",Math.round(a),Math.round(o)]),s.push(["line",Math.round(a+i),Math.round(o)]),s.push(["line",Math.round(a+i),Math.round(l+o)]),s.push(["line",Math.round(a),Math.round(l+o)]),F(t,s),t.save(),t.clip(),j(t,e,n,r),t.restore()}function X(t,e,n){d(t,e.left,e.top,e.width,e.height,n)}function _(t,e,n,r,a){var o=ue.BackgroundSize(t,e,r,a),i=ue.BackgroundPosition(t,e,r,a,o),l=ge(t,"backgroundRepeat").split(",").map(ue.trimText);switch(r=Q(r,o),l=l[a]||l[0]){case"repeat-x":q(n,r,i,e,e.left,e.top+i.top,99999,r.height);break;case"repeat-y":q(n,r,i,e,e.left+i.left,e.top,r.width,99999);break;case"no-repeat":q(n,r,i,e,e.left+i.left,e.top+i.top,r.width,r.height);break;default:j(n,r,i,{top:e.top,left:e.left,width:r.width,height:r.height})}}function Y(t,e,n){for(var r,a=ge(t,"backgroundImage"),o=ue.parseBackgroundImage(a),i=o.length;i--;)if(a=o[i],a.args&&0!==a.args.length){var l="url"===a.method?a.args[0]:a.value;r=M(l),r?_(t,e,n,r,i):ue.log("html2canvas: Error loading background:",a)}}function Q(t,e){if(t.width===e.width&&t.height===e.height)return t;var n,r=de.createElement("canvas");return r.width=e.width,r.height=e.height,n=r.getContext("2d"),$(n,t,0,0,t.width,t.height,0,0,e.width,e.height),r}function J(t,e,n){return t.setVariable("globalAlpha",ge(e,"opacity")*(n?n.opacity:1))}function K(t){return t.replace("px","")}function Z(t){var e=ge(t,"transform")||ge(t,"-webkit-transform")||ge(t,"-moz-transform")||ge(t,"-ms-transform")||ge(t,"-o-transform"),n=ge(t,"transform-origin")||ge(t,"-webkit-transform-origin")||ge(t,"-moz-transform-origin")||ge(t,"-ms-transform-origin")||ge(t,"-o-transform-origin")||"0px 0px";n=n.split(" ").map(K).map(ue.asFloat);var r;if(e&&"none"!==e){var a=e.match(we);if(a)switch(a[1]){case"matrix":r=a[2].split(",").map(ue.trimText).map(ue.asFloat)}}return{origin:n,matrix:r}}function te(t,e,n,r){var s=l(e?n.width:o(),e?n.height:i()),c={ctx:s,opacity:J(s,t,e),cssPosition:ge(t,"position"),borders:L(t),transform:r,clip:e&&e.clip?ue.Extend({},e.clip):null};return E(t,c,e),a.useOverflow===!0&&/(hidden|scroll|auto)/.test(ge(t,"overflow"))===!0&&/(BODY)/i.test(t.nodeName)===!1&&(c.clip=c.clip?R(c.clip,n):n),c}function ee(t,e,n){var r={left:e.left+t[3].width,top:e.top+t[0].width,width:e.width-(t[1].width+t[3].width),height:e.height-(t[0].width+t[2].width)};return n&&(r=R(r,n)),r}function ne(t,e){var n=e.matrix?ue.OffsetBounds(t):ue.Bounds(t);return e.origin[0]+=n.left,e.origin[1]+=n.top,n}function re(t,e,n,r){var a,o=Z(t,e),i=ne(t,o),l=te(t,e,i,o),s=l.borders,c=l.ctx,d=ee(s,i,l.clip),u=P(t,i,s),h=fe.test(t.nodeName)?"#efefef":ge(t,"backgroundColor");switch(F(c,u.clip),c.save(),c.clip(),d.height>0&&d.width>0&&!r?(X(c,i,h),Y(t,d,c)):r&&(l.backgroundColor=h),c.restore(),u.borders.forEach(function(t){V(c,t.args,t.color)}),n||H(t,l),t.nodeName){case"IMG":(a=M(t.getAttribute("src")))?I(c,t,a,i,s):ue.log("html2canvas: Error loading <img>:"+t.getAttribute("src"));break;case"INPUT":/^(text|url|email|submit|button|reset)$/.test(t.type)&&(t.value||t.placeholder||"").length>0&&D(t,i,l);break;case"TEXTAREA":(t.value||t.placeholder||"").length>0&&D(t,i,l);break;case"SELECT":(t.options||t.placeholder||"").length>0&&D(t,i,l);break;case"LI":S(t,l,d);break;case"CANVAS":I(c,t,t,i,s)}return l}function ae(t){return"none"!==ge(t,"display")&&"hidden"!==ge(t,"visibility")&&!t.hasAttribute("data-html2canvas-ignore")}function oe(t,e,n){ae(t)&&(e=re(t,e,n,!1)||e,fe.test(t.nodeName)||ie(t,e,n))}function ie(t,e,n){ue.Children(t).forEach(function(r){r.nodeType===r.ELEMENT_NODE?oe(r,e,n):r.nodeType===r.TEXT_NODE&&v(t,r,e)})}function le(){var t=ge(e.documentElement,"backgroundColor"),n=ue.isTransparent(t)&&se===e.body,r=re(se,null,!1,n);return ie(se,r),n&&(t=r.backgroundColor),pe.removeChild(ye),{backgroundColor:t,stack:r}}t.scroll(0,0);var se=a.elements===n?e.body:a.elements[0],ce=0,de=se.ownerDocument,ue=u.Util,he=ue.Support(a,de),fe=RegExp("("+a.ignoreElements+")"),pe=de.body,ge=ue.getCSS,me="___html2canvas___pseudoelement",ye=de.createElement("style");ye.innerHTML="."+me+'-before:before { content: "" !important; display: none !important; }'+"."+me+'-after:after { content: "" !important; display: none !important; }',pe.appendChild(ye),r=r||{};var be=function(t){return function(e,n,r,a){var o=r*t,i=a*t,l=e+r,s=n+a;return{topLeft:z({x:e,y:s},{x:e,y:s-i},{x:l-o,y:n},{x:l,y:n}),topRight:z({x:e,y:n},{x:e+o,y:n},{x:l,y:s-i},{x:l,y:s}),bottomRight:z({x:l,y:n},{x:l,y:n+i},{x:e+o,y:s},{x:e,y:s}),bottomLeft:z({x:l,y:s},{x:l-o,y:s},{x:e,y:n+i},{x:e,y:n})}}}(4*((Math.sqrt(2)-1)/3)),we=/(matrix)$(.+)$/;return le()},u.Preload=function(r){function a(t){M.href=t,M.href=M.href;var e=M.protocol+M.host;return e===g}function o(){x.log("html2canvas: start: images: "+w.numLoaded+" / "+w.numTotal+" (failed: "+w.numFailed+")"),!w.firstRun&&w.numLoaded>=w.numTotal&&(x.log("Finished loading images: # "+w.numTotal+" (failed: "+w.numFailed+")"),"function"==typeof r.complete&&r.complete(w))}function i(e,a,i){var l,s,c=r.proxy;M.href=e,e=M.href,l="html2canvas_"+v++,i.callbackname=l,c+=c.indexOf("?")>-1?"&":"?",c+="url="+encodeURIComponent(e)+"&callback="+l,s=C.createElement("script"),t[l]=function(e){"error:"===e.substring(0,6)?(i.succeeded=!1,w.numLoaded++,w.numFailed++,o()):(p(a,i),a.src=e),t[l]=n;try{delete t[l]}catch(r){}s.parentNode.removeChild(s),s=null,delete i.script,delete i.callbackname},s.setAttribute("type","text/javascript"),s.setAttribute("src",c),i.script=s,t.document.body.appendChild(s)}function l(e,n){var r=t.getComputedStyle(e,n),a=r.content;"url"===a.substr(0,3)&&m.loadImage(u.Util.parseBackgroundImage(a)[0].args[0]),h(r.backgroundImage,e)}function s(t){l(t,":before"),l(t,":after")}function c(t,e){var r=u.Generate.Gradient(t,e);r!==n&&(w[t]={img:r,succeeded:!0},w.numTotal++,w.numLoaded++,o())}function d(t){return t&&t.method&&t.args&&t.args.length>0}function h(t,e){var r;u.Util.parseBackgroundImage(t).filter(d).forEach(function(t){"url"===t.method?m.loadImage(t.args[0]):t.method.match(/\-?gradient$/)&&(r===n&&(r=u.Util.Bounds(e)),c(t.value,r))})}function f(t){var e=!1;try{x.Children(t).forEach(f)}catch(r){}try{e=t.nodeType}catch(a){e=!1,x.log("html2canvas: failed to access some element's nodeType - Exception: "+a.message)}if(1===e||e===n){s(t);try{h(x.getCSS(t,"backgroundImage"),t)}catch(r){x.log("html2canvas: failed to get background-image - Exception: "+r.message)}h(t)}}function p(e,a){e.οnlοad=function(){a.timer!==n&&t.clearTimeout(a.timer),w.numLoaded++,a.succeeded=!0,e.οnerrοr=e.οnlοad=null,o()},e.οnerrοr=function(){if("anonymous"===e.crossOrigin&&(t.clearTimeout(a.timer),r.proxy)){var l=e.src;return e=new Image,a.img=e,e.src=l,i(e.src,e,a),n}w.numLoaded++,w.numFailed++,a.succeeded=!1,e.οnerrοr=e.οnlοad=null,o()}}var g,m,y,b,w={numLoaded:0,numFailed:0,numTotal:0,cleanupDone:!1},x=u.Util,v=0,k=r.elements[0]||e.body,C=k.ownerDocument,T=k.getElementsByTagName("img"),S=T.length,M=C.createElement("a"),R=function(t){return t.crossOrigin!==n}(new Image);for(M.href=t.location.href,g=M.protocol+M.host,m={loadImage:function(t){var e,o;t&&w[t]===n&&(e=new Image,t.match(/data:image\/.*;base64,/i)?(e.src=t.replace(/url$['"]{0,}|['"]{0,}$$/gi,""),o=w[t]={img:e},w.numTotal++,p(e,o)):a(t)||r.allowTaint===!0?(o=w[t]={img:e},w.numTotal++,p(e,o),e.src=t):R&&!r.allowTaint&&r.useCORS?(e.crossOrigin="anonymous",o=w[t]={img:e},w.numTotal++,p(e,o),e.src=t):r.proxy&&(o=w[t]={img:e},w.numTotal++,i(t,e,o)))},cleanupDOM:function(a){var i,l;if(!w.cleanupDone){a&&"string"==typeof a?x.log("html2canvas: Cleanup because: "+a):x.log("html2canvas: Cleanup after timeout: "+r.timeout+" ms.");for(l in w)if(w.hasOwnProperty(l)&&(i=w[l],"object"==typeof i&&i.callbackname&&i.succeeded===n)){t[i.callbackname]=n;try{delete t[i.callbackname]}catch(s){}i.script&&i.script.parentNode&&(i.script.setAttribute("src","about:blank"),i.script.parentNode.removeChild(i.script)),w.numLoaded++,w.numFailed++,x.log("html2canvas: Cleaned up failed img: '"+l+"' Steps: "+w.numLoaded+" / "+w.numTotal)}t.stop!==n?t.stop():e.execCommand!==n&&e.execCommand("Stop",!1),e.close!==n&&e.close(),w.cleanupDone=!0,a&&"string"==typeof a||o()}},renderingDone:function(){b&&t.clearTimeout(b)}},r.timeout>0&&(b=t.setTimeout(m.cleanupDOM,r.timeout)),x.log("html2canvas: Preload starts: finding background-images"),w.firstRun=!0,f(k),x.log("html2canvas: Preload: Finding images"),y=0;S>y;y+=1)m.loadImage(T[y].getAttribute("src"));return w.firstRun=!1,x.log("html2canvas: Preload: Done."),w.numTotal===w.numLoaded&&o(),m},u.Renderer=function(t,r){function a(t){function e(t){Object.keys(t).sort().forEach(function(n){var r=[],o=[],i=[],l=[];
    t[n].forEach(function(t){t.node.zIndex.isPositioned||1>t.node.zIndex.opacity?i.push(t):t.node.zIndex.isFloated?o.push(t):r.push(t)}),function s(t){t.forEach(function(t){l.push(t),t.children&&s(t.children)})}(r.concat(o,i)),l.forEach(function(t){t.context?e(t.context):a.push(t.node)})})}var r,a=[];return r=function(t){function e(t,r,a){var o="auto"===r.zIndex.zindex?0:Number(r.zIndex.zindex),i=t,l=r.zIndex.isPositioned,s=r.zIndex.isFloated,c={node:r},d=a;r.zIndex.ownStacking?(i=c.context={"!":[{node:r,children:[]}]},d=n):(l||s)&&(d=c.children=[]),0===o&&a?a.push(c):(t[o]||(t[o]=[]),t[o].push(c)),r.zIndex.children.forEach(function(t){e(i,t,d)})}var r={};return e(r,t),r}(t),e(r),a}function o(t){var e;if("string"==typeof r.renderer&&u.Renderer[t]!==n)e=u.Renderer[t](r);else{if("function"!=typeof t)throw Error("Unknown renderer");e=t(r)}if("function"!=typeof e)throw Error("Invalid renderer defined");return e}return o(r.renderer)(t,r,e,a(t.stack),u)},u.Util.Support=function(t,e){function r(){var t=new Image,r=e.createElement("canvas"),a=r.getContext===n?!1:r.getContext("2d");if(a===!1)return!1;r.width=r.height=10,t.src=["data:image/svg+xml,","<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10'>","<foreignObject width='10' height='10'>","<div xmlns='http://www.w3.org/1999/xhtml' style='width:10;height:10;'>","sup","</div>","</foreignObject>","</svg>"].join("");try{a.drawImage(t,0,0),r.toDataURL()}catch(o){return!1}return u.Util.log("html2canvas: Parse: SVG powered rendering available"),!0}function a(){var t,n,r,a,o=!1;return e.createRange&&(t=e.createRange(),t.getBoundingClientRect&&(n=e.createElement("boundtest"),n.style.height="123px",n.style.display="block",e.body.appendChild(n),t.selectNode(n),r=t.getBoundingClientRect(),a=r.height,123===a&&(o=!0),e.body.removeChild(n))),o}return{rangeBounds:a(),svgRendering:t.svgRendering&&r()}},t.html2canvas=function(e,n){e=e.length?e:[e];var r,a,o={logging:!1,elements:e,background:"#fff",proxy:null,timeout:0,useCORS:!1,allowTaint:!1,svgRendering:!1,ignoreElements:"IFRAME|OBJECT|PARAM",useOverflow:!0,letterRendering:!1,chinese:!1,width:null,height:null,taintTest:!0,renderer:"Canvas"};return o=u.Util.Extend(n,o),u.logging=o.logging,o.complete=function(t){("function"!=typeof o.onpreloaded||o.onpreloaded(t)!==!1)&&(r=u.Parse(t,o),("function"!=typeof o.onparsed||o.onparsed(r)!==!1)&&(a=u.Renderer(r,o),"function"==typeof o.onrendered&&o.onrendered(a)))},t.setTimeout(function(){u.Preload(o)},0),{render:function(t,e){return u.Renderer(t,u.Util.Extend(e,o))},parse:function(t,e){return u.Parse(t,u.Util.Extend(e,o))},preload:function(t){return u.Preload(u.Util.Extend(t,o))},log:u.Util.log}},t.html2canvas.log=u.Util.log,t.html2canvas.Renderer={Canvas:n},u.Renderer.Canvas=function(t){function r(t,e){t.beginPath(),e.forEach(function(e){t[e.name].apply(t,e.arguments)}),t.closePath()}function a(t){if(-1===l.indexOf(t.arguments[0].src)){c.drawImage(t.arguments[0],0,0);try{c.getImageData(0,0,1,1)}catch(e){return s=i.createElement("canvas"),c=s.getContext("2d"),!1}l.push(t.arguments[0].src)}return!0}function o(e,n){switch(n.type){case"variable":e[n.name]=n.arguments;break;case"function":switch(n.name){case"createPattern":if(n.arguments[0].width>0&&n.arguments[0].height>0)try{e.fillStyle=e.createPattern(n.arguments[0],"repeat")}catch(o){d.log("html2canvas: Renderer: Error creating pattern",o.message)}break;case"drawShape":r(e,n.arguments);break;case"drawImage":n.arguments[8]>0&&n.arguments[7]>0&&(!t.taintTest||t.taintTest&&a(n))&&e.drawImage.apply(e,n.arguments);break;default:e[n.name].apply(e,n.arguments)}}}t=t||{};var i=e,l=[],s=e.createElement("canvas"),c=s.getContext("2d"),d=u.Util,h=t.canvas||i.createElement("canvas");return function(t,e,r,a,i){var l,s,c,u=h.getContext("2d"),f=t.stack;return h.width=h.style.width=e.width||f.ctx.width,h.height=h.style.height=e.height||f.ctx.height,c=u.fillStyle,u.fillStyle=d.isTransparent(f.backgroundColor)&&e.background!==n?e.background:t.backgroundColor,u.fillRect(0,0,h.width,h.height),u.fillStyle=c,a.forEach(function(t){u.textBaseline="bottom",u.save(),t.transform.matrix&&(u.translate(t.transform.origin[0],t.transform.origin[1]),u.transform.apply(u,t.transform.matrix),u.translate(-t.transform.origin[0],-t.transform.origin[1])),t.clip&&(u.beginPath(),u.rect(t.clip.left,t.clip.top,t.clip.width,t.clip.height),u.clip()),t.ctx.storage&&t.ctx.storage.forEach(function(t){o(u,t)}),u.restore()}),d.log("html2canvas: Renderer: Canvas renderer done - returning canvas obj"),1===e.elements.length&&"object"==typeof e.elements[0]&&"BODY"!==e.elements[0].nodeName?(s=i.Util.Bounds(e.elements[0]),l=r.createElement("canvas"),l.width=Math.ceil(s.width),l.height=Math.ceil(s.height),u=l.getContext("2d"),u.drawImage(h,s.left,s.top,s.width,s.height,0,0,s.width,s.height),h=null,l):h}}})(window,document);

canvas2image.js 库文件源代码：（复制可用）

/*
     * Canvas2Image v0.1
     * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk
     * MIT License [http://www.opensource.org/licenses/mit-license.php]
     */
    
    var Canvas2Image = (function() {
    
    	// check if we have canvas support
    	var bHasCanvas = false;
    	var oCanvas = document.createElement("canvas");
    	if (oCanvas.getContext("2d")) {
    		bHasCanvas = true;
    	}
    
    	// no canvas, bail out.
    	if (!bHasCanvas) {
    		return {
    			saveAsBMP : function(){},
    			saveAsPNG : function(){},
    			saveAsJPEG : function(){}
    		}
    	}
    
    	var bHasImageData = !!(oCanvas.getContext("2d").getImageData);
    	var bHasDataURL = !!(oCanvas.toDataURL);
    	var bHasBase64 = !!(window.btoa);
    
    	var strDownloadMime = "image/octet-stream";
    
    	// ok, we're good
    	var readCanvasData = function(oCanvas) {
    		var iWidth = parseInt(oCanvas.width);
    		var iHeight = parseInt(oCanvas.height);
    		return oCanvas.getContext("2d").getImageData(0,0,iWidth,iHeight);
    	}
    
    	// base64 encodes either a string or an array of charcodes
    	var encodeData = function(data) {
    		var strData = "";
    		if (typeof data == "string") {
    			strData = data;
    		} else {
    			var aData = data;
    			for (var i=0;i<aData.length;i++) {
    				strData += String.fromCharCode(aData[i]);
    			}
    		}
    		return btoa(strData);
    	}
    
    	// creates a base64 encoded string containing BMP data
    	// takes an imagedata object as argument
    	var createBMP = function(oData) {
    		var aHeader = [];
    	
    		var iWidth = oData.width;
    		var iHeight = oData.height;
    
    		aHeader.push(0x42); // magic 1
    		aHeader.push(0x4D); 
    	
    		var iFileSize = iWidth*iHeight*3 + 54; // total header size = 54 bytes
    		aHeader.push(iFileSize % 256); iFileSize = Math.floor(iFileSize / 256);
    		aHeader.push(iFileSize % 256); iFileSize = Math.floor(iFileSize / 256);
    		aHeader.push(iFileSize % 256); iFileSize = Math.floor(iFileSize / 256);
    		aHeader.push(iFileSize % 256);
    
    		aHeader.push(0); // reserved
    		aHeader.push(0);
    		aHeader.push(0); // reserved
    		aHeader.push(0);
    
    		aHeader.push(54); // dataoffset
    		aHeader.push(0);
    		aHeader.push(0);
    		aHeader.push(0);
    
    		var aInfoHeader = [];
    		aInfoHeader.push(40); // info header size
    		aInfoHeader.push(0);
    		aInfoHeader.push(0);
    		aInfoHeader.push(0);
    
    		var iImageWidth = iWidth;
    		aInfoHeader.push(iImageWidth % 256); iImageWidth = Math.floor(iImageWidth / 256);
    		aInfoHeader.push(iImageWidth % 256); iImageWidth = Math.floor(iImageWidth / 256);
    		aInfoHeader.push(iImageWidth % 256); iImageWidth = Math.floor(iImageWidth / 256);
    		aInfoHeader.push(iImageWidth % 256);
    	
    		var iImageHeight = iHeight;
    		aInfoHeader.push(iImageHeight % 256); iImageHeight = Math.floor(iImageHeight / 256);
    		aInfoHeader.push(iImageHeight % 256); iImageHeight = Math.floor(iImageHeight / 256);
    		aInfoHeader.push(iImageHeight % 256); iImageHeight = Math.floor(iImageHeight / 256);
    		aInfoHeader.push(iImageHeight % 256);
    	
    		aInfoHeader.push(1); // num of planes
    		aInfoHeader.push(0);
    	
    		aInfoHeader.push(24); // num of bits per pixel
    		aInfoHeader.push(0);
    	
    		aInfoHeader.push(0); // compression = none
    		aInfoHeader.push(0);
    		aInfoHeader.push(0);
    		aInfoHeader.push(0);
    	
    		var iDataSize = iWidth*iHeight*3; 
    		aInfoHeader.push(iDataSize % 256); iDataSize = Math.floor(iDataSize / 256);
    		aInfoHeader.push(iDataSize % 256); iDataSize = Math.floor(iDataSize / 256);
    		aInfoHeader.push(iDataSize % 256); iDataSize = Math.floor(iDataSize / 256);
    		aInfoHeader.push(iDataSize % 256); 
    	
    		for (var i=0;i<16;i++) {
    			aInfoHeader.push(0);	// these bytes not used
    		}
    	
    		var iPadding = (4 - ((iWidth * 3) % 4)) % 4;
    
    		var aImgData = oData.data;
    
    		var strPixelData = "";
    		var y = iHeight;
    		do {
    			var iOffsetY = iWidth*(y-1)*4;
    			var strPixelRow = "";
    			for (var x=0;x<iWidth;x++) {
    				var iOffsetX = 4*x;
    
    				strPixelRow += String.fromCharCode(aImgData[iOffsetY+iOffsetX+2]);
    				strPixelRow += String.fromCharCode(aImgData[iOffsetY+iOffsetX+1]);
    				strPixelRow += String.fromCharCode(aImgData[iOffsetY+iOffsetX]);
    			}
    			for (var c=0;c<iPadding;c++) {
    				strPixelRow += String.fromCharCode(0);
    			}
    			strPixelData += strPixelRow;
    		} while (--y);
    
    		var strEncoded = encodeData(aHeader.concat(aInfoHeader)) + encodeData(strPixelData);
    
    		return strEncoded;
    	}
    
    
    	// sends the generated file to the client
    	var saveFile = function(strData) {
    		document.location.href = strData;
    	}
    
    	var makeDataURI = function(strData, strMime) {
    		return "data:" + strMime + ";base64," + strData;
    	}
    
    	// generates a <img> object containing the imagedata
    	var makeImageObject = function(strSource) {
    		var oImgElement = document.createElement("img");
    		oImgElement.src = strSource;
    		return oImgElement;
    	}
    
    	var scaleCanvas = function(oCanvas, iWidth, iHeight) {
    		if (iWidth && iHeight) {
    			var oSaveCanvas = document.createElement("canvas");
    			oSaveCanvas.width = iWidth;
    			oSaveCanvas.height = iHeight;
    			oSaveCanvas.style.width = iWidth+"px";
    			oSaveCanvas.style.height = iHeight+"px";
    
    			var oSaveCtx = oSaveCanvas.getContext("2d");
    
    			oSaveCtx.drawImage(oCanvas, 0, 0, oCanvas.width, oCanvas.height, 0, 0, iWidth, iHeight);
    			return oSaveCanvas;
    		}
    		return oCanvas;
    	}
    
    	return {
    
    		saveAsPNG : function(oCanvas, bReturnImg, iWidth, iHeight) {
    			if (!bHasDataURL) {
    				return false;
    			}
    			var oScaledCanvas = scaleCanvas(oCanvas, iWidth, iHeight);
    			var strData = oScaledCanvas.toDataURL("image/png");
    			if (bReturnImg) {
    				return makeImageObject(strData);
    			} else {
    				saveFile(strData.replace("image/png", strDownloadMime));
    			}
    			return true;
    		},
    
    		saveAsJPEG : function(oCanvas, bReturnImg, iWidth, iHeight) {
    			if (!bHasDataURL) {
    				return false;
    			}
    
    			var oScaledCanvas = scaleCanvas(oCanvas, iWidth, iHeight);
    			var strMime = "image/jpeg";
    			var strData = oScaledCanvas.toDataURL(strMime);
    	
    			// check if browser actually supports jpeg by looking for the mime type in the data uri.
    			// if not, return false
    			if (strData.indexOf(strMime) != 5) {
    				return false;
    			}
    
    			if (bReturnImg) {
    				return makeImageObject(strData);
    			} else {
    				saveFile(strData.replace(strMime, strDownloadMime));
    			}
    			return true;
    		},
    
    		saveAsBMP : function(oCanvas, bReturnImg, iWidth, iHeight) {
    			if (!(bHasImageData && bHasBase64)) {
    				return false;
    			}
    
    			var oScaledCanvas = scaleCanvas(oCanvas, iWidth, iHeight);
    
    			var oData = readCanvasData(oScaledCanvas);
    			var strImgData = createBMP(oData);
    			if (bReturnImg) {
    				return makeImageObject(makeDataURI(strImgData, "image/bmp"));
    			} else {
    				saveFile(makeDataURI(strImgData, strDownloadMime));
    			}
    			return true;
    		}
    	};
    
    })();

**base64.js 库文件源代码：（复制可用）**

/* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
     * Version: 1.0
     * LastModified: Dec 25 1999
     * This library is free.  You can redistribute it and/or modify it.
     */
    
    /*
     * Interfaces:
     * b64 = base64encode(data);
     * data = base64decode(b64);
     */
    
    (function() {
    
    var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var base64DecodeChars = new Array(
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
        -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
        -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
        41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
    
    function base64encode(str) {
        var out, i, len;
        var c1, c2, c3;
    
        len = str.length;
        i = 0;
        out = "";
        while(i < len) {
    	c1 = str.charCodeAt(i++) & 0xff;
    	if(i == len)
    	{
    	    out += base64EncodeChars.charAt(c1 >> 2);
    	    out += base64EncodeChars.charAt((c1 & 0x3) << 4);
    	    out += "==";
    	    break;
    	}
    	c2 = str.charCodeAt(i++);
    	if(i == len)
    	{
    	    out += base64EncodeChars.charAt(c1 >> 2);
    	    out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
    	    out += base64EncodeChars.charAt((c2 & 0xF) << 2);
    	    out += "=";
    	    break;
    	}
    	c3 = str.charCodeAt(i++);
    	out += base64EncodeChars.charAt(c1 >> 2);
    	out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
    	out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
    	out += base64EncodeChars.charAt(c3 & 0x3F);
        }
        return out;
    }
    
    function base64decode(str) {
        var c1, c2, c3, c4;
        var i, len, out;
    
        len = str.length;
        i = 0;
        out = "";
        while(i < len) {
    	/* c1 */
    	do {
    	    c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    	} while(i < len && c1 == -1);
    	if(c1 == -1)
    	    break;
    
    	/* c2 */
    	do {
    	    c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    	} while(i < len && c2 == -1);
    	if(c2 == -1)
    	    break;
    
    	out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
    
    	/* c3 */
    	do {
    	    c3 = str.charCodeAt(i++) & 0xff;
    	    if(c3 == 61)
    		return out;
    	    c3 = base64DecodeChars[c3];
    	} while(i < len && c3 == -1);
    	if(c3 == -1)
    	    break;
    
    	out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
    
    	/* c4 */
    	do {
    	    c4 = str.charCodeAt(i++) & 0xff;
    	    if(c4 == 61)
    		return out;
    	    c4 = base64DecodeChars[c4];
    	} while(i < len && c4 == -1);
    	if(c4 == -1)
    	    break;
    	out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
        }
        return out;
    }
    
    if (!window.btoa) window.btoa = base64encode;
    if (!window.atob) window.atob = base64decode;
    
    })();

**备注：   html2canvas 只能在服务器中抓取img，**

** 如果是在本地编辑文件在浏览器** **上可以抓取除了img标签外的元素，**

** 但是节点中的img是抓取不到的**

** 必须将代码放在服务器中进行对img标签进行抓取**

[Link 1]: https://pan.baidu.com/s/1nw4nHRr
[SouthEast]: /images/20220601/2d5d2b0dbfa04f2e94b864b3f320a26b.png
[SouthEast 1]: /images/20220601/464978d1567243fe8fe59138a57aa49c.png
[SouthEast 2]: /images/20220601/e6a7cee78be94136939bbd0e7e993ace.png
[SouthEast 3]: /images/20220601/e44ed86abb724868ba148fefc698d875.png