关于微信分享缩略图相关问题

太过爱你忘了你带给我的痛 2021-10-19 10:26 370阅读 0赞

必须要认证的公众号才有分享的权限  
要用jssdk来做  
网上其他的方法都没有效果，最多只能有个标题，描述跟缩略图是没有的

### 文章目录 ###

*  1、前端代码
 *  2、php后端代码 getJsAPITicket.php
 *  3、排查错误方法

是php，下面给出详细的步骤  
注意：  
1、微信公众号要有分享的权限才能进行后面的步骤  
2、公众号后台填写js安全域名，IP白名单也要填好

# 1、前端代码 #

<script src="js/jquery.min.js"></script>
    <script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
    
    $(function() {
        //微信分享
        $.ajax({
            url:"http://www.****.com/getJsAPITicket.php",  //接口地址,填你自己的，这里主要获取配置文件的参数
            type:"Get",
            dataType:"json",
           	data:{"url": encodeURIComponent(window.location.href.split('#')[0])},  //注意，这里的url后端要获取的，不这么写会报错
            success:function(data){
                 wxstart(data, "");
            }
        });
    });
    
    function wxstart(data,url){
    		
    		wx.config({
    			debug: false,
    			appId: data.appId,
    			timestamp: data.timestamp,
    			nonceStr: data.nonceStr,
    			signature: data.signature,
    			jsApiList: [
    				'onMenuShareTimeline',
    				'onMenuShareAppMessage' //这里还可以有qq的接口之类的，看你需求
    			  ]
    		});
    
    		wx.ready(function () {
    			var shareData = {
    				title: '********',	//	标题
    				desc: '************',	//	描述
    				link: 'http://www.******.com/',	//	分享的URL，必须和当前打开的网页的URL是一样的
    				imgUrl: 'http://www.******.com/logo.png'	//	缩略图地址
    			};
    			wx.onMenuShareTimeline(shareData);
    			wx.onMenuShareAppMessage(shareData);
    		});
    		wx.error(function (res) {
    		  alert(res.errMsg);//错误提示
    		});
    
    	}

# 2、php后端代码 getJsAPITicket.php #

$jssdk = new JSSDK("wx3********e70", "6202c9b5a*******c6492271525");
    
    $signPackage = $jssdk->GetSignPackage();
    
    echo json_encode($signPackage);die;
    
    class JSSDK {
      private $appId;
      private $appSecret;
    
      public function __construct($appId, $appSecret) {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
      }
    
      public function getSignPackage() {
        $jsapiTicket = $this->getJsApiTicket();
        //$url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
        $url = urldecode($_GET['url']);
        $timestamp = time();
        $nonceStr = $this->createNonceStr();
    
        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
    
        $signature = sha1($string);
    
        $signPackage = array(
          "appId"     => $this->appId,
          "nonceStr"  => $nonceStr,
          "timestamp" => $timestamp,
          "url"       => $url,
          "signature" => $signature,
          "rawString" => $string
        );
    
        return $signPackage; 
      }
    
      private function createNonceStr($length = 16) {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
          $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
      }
    
      private function getJsApiTicket() {
        // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode(file_get_contents("jsapi_ticket.json"));
        if ($data->expire_time < time()) {
          
          $accessToken = $this->getAccessToken();
    
          $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
          $res = json_decode($this->httpGet($url));
          $ticket = $res->ticket;
          if ($ticket) {
            $data->expire_time = time() + 7000;
            $data->jsapi_ticket = $ticket;
            $fp = fopen("jsapi_ticket.json", "w");
            fwrite($fp, json_encode($data));
            fclose($fp);
          }
        } else {
          
          $ticket = $data->jsapi_ticket;
        }
    
        return $ticket;
      }
    
      private function getAccessToken() {
        // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode(file_get_contents("access_token.json"));
        if ($data->expire_time < time()) {
    
          $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
          $res = json_decode($this->httpGet($url));
          
          $access_token = $res->access_token;
          if ($access_token) {
            $data->expire_time = time() + 7000;
            $data->access_token = $access_token;
            $fp = fopen("access_token.json", "w");
            fwrite($fp, json_encode($data));
            fclose($fp);
          }
        } else {
          $access_token = $data->access_token;
        }
        return $access_token;
      }
    
       private function httpGet($url) {
             $headers = array('User-Agent:Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36');
            $oCurl = curl_init();
            if(stripos($url,"https://")!==FALSE){
                curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
                curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, FALSE);
                curl_setopt($oCurl, CURLOPT_SSLVERSION, 1); //CURL_SSLVERSION_TLSv1
            }
            curl_setopt($oCurl, CURLOPT_TIMEOUT, 20);
            curl_setopt($oCurl, CURLOPT_URL, $url);
            curl_setopt($oCurl, CURLOPT_HTTPHEADER, $headers);
            curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1 );
            $sContent = curl_exec($oCurl);
            $aStatus = curl_getinfo($oCurl);
            curl_close($oCurl);
            if(intval($aStatus["http_code"])==200){
                return $sContent;
            }else{
                return false;
            }
          }
    }

# 3、排查错误方法 #

1、用微信开发者工具打开网页，出错他会提示  
2、判断access\_token 是否能够正确获取  
上 微信公众平台接口调试工具调试 https://mp.weixin.qq.com/debug/  
可能原因就是js安全域名、IP白名单、appSecret出错  
3、判断signature是否能正确获取  
http://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign  
4、其他可能的错误  
https://mp.weixin.qq.com/wiki?action=doc&id=mp1421141115&t=0.20000340685689832\#62 看这里面的附录5，一点点对照着来。