从0到1搭建一款页面自适应组件（Vue.js）

偏执的太偏执、 2021-09-07 06:11 642阅读 0赞

组件将根据屏幕比例及当前浏览器窗口大小，自动进行缩放处理。

建议在组件内使用百分比搭配flex进行布局，以便于在不同的分辨率下得到较为一致的展示效果。  
使用前请注意将body的margin设为0，否则会引起计算误差。

**fullScreenContainer.vue**

<template>
      <div id="full-screen-container" :ref="ref">
        <template v-if="ready">
          <slot></slot>
        </template>
      </div>
    </template>
    <script> import autoResize from './autoResize.js' export default { name: 'DvFullScreenContainer', mixins: [autoResize], data () { return { ref: 'full-screen-container', allWidth: 0, scale: 0, datavRoot: '', ready: false } }, methods: { afterAutoResizeMixinInit () { const { initConfig, setAppScale } = this initConfig() setAppScale() this.ready = true }, initConfig () { const { dom } = this const { width, height } = screen this.allWidth = width dom.style.width = `${ width}px` dom.style.height = `${ height}px` }, setAppScale () { const { allWidth, dom } = this const currentWidth = document.body.clientWidth dom.style.transform = `scale(${ currentWidth / allWidth})` }, onResize () { const { setAppScale } = this setAppScale() } } } </script>
    <style lang="scss"> #full-screen-container { position: fixed; top: 0px; left: 0px; overflow: hidden; transform-origin: left top; z-index: 999; } </style>

**autoResize.js**

export default { 
        data() { 
            return { 
                dom: '',
                width: 0,
                height: 0,
                debounceInitWHFun: '',
                domObserver: ''
            };
        },
        methods: { 
            debounce(delay, callback) { 
                let lastTime;
                return function() { 
                    clearTimeout(lastTime);
                    const [that, args] = [this, arguments];
                    lastTime = setTimeout(() => { 
                        callback.apply(that, args);
                    }, delay);
                };
            },
            observerDomResize(dom, callback) { 
                const MutationObserver =
                    window.MutationObserver ||
                    window.WebKitMutationObserver ||
                    window.MozMutationObserver;
                const observer = new MutationObserver(callback);
                observer.observe(dom, { 
                    attributes: true,
                    attributeFilter: ['style'],
                    attributeOldValue: true
                });
                return observer;
            },
            async autoResizeMixinInit() { 
                const { 
                    initWH,
                    getDebounceInitWHFun,
                    bindDomResizeCallback,
                    afterAutoResizeMixinInit
                } = this;
                await initWH(false);
                getDebounceInitWHFun();
                bindDomResizeCallback();
                if (typeof afterAutoResizeMixinInit === 'function')
                    afterAutoResizeMixinInit();
            },
            initWH(resize = true) { 
                const {  $nextTick, $refs, ref, onResize } = this;
                return new Promise(resolve => { 
                    $nextTick(() => { 
                        const dom = (this.dom = $refs[ref]);
                        this.width = dom ? dom.clientWidth : 0;
                        this.height = dom ? dom.clientHeight : 0;
                        if (!dom) { 
                            console.warn(
                                'DataV: Failed to get dom node, component rendering may be abnormal!'
                            );
                        } else if (!this.width || !this.height) { 
                            console.warn(
                                'DataV: Component width or height is 0px, rendering abnormality may occur!'
                            );
                        }
                        if (typeof onResize === 'function' && resize) onResize();
                        resolve();
                    });
                });
            },
            getDebounceInitWHFun() { 
                const {  initWH } = this;
                this.debounceInitWHFun = this.debounce(100, initWH);
            },
            bindDomResizeCallback() { 
                const {  dom, debounceInitWHFun } = this;
                this.domObserver = this.observerDomResize(dom, debounceInitWHFun);
                window.addEventListener('resize', debounceInitWHFun);
            },
            unbindDomResizeCallback() { 
                let {  domObserver, debounceInitWHFun } = this;
                if (!domObserver) return;
                domObserver.disconnect();
                domObserver.takeRecords();
                domObserver = null;
                window.removeEventListener('resize', debounceInitWHFun);
            }
        },
        mounted() { 
            const {  autoResizeMixinInit } = this;
            autoResizeMixinInit();
        },
        beforeDestroy() { 
            const {  unbindDomResizeCallback } = this;
            unbindDomResizeCallback();
        }
    };

这样，一个页面自适应组件就这样搭建完成了，下面，我们将引入组件看一下效果。

<template>
      <div id="app">
        <fullScreenContainer>
          <img alt="Vue logo" src="./assets/logo.png" />
          <HelloWorld msg="Welcome to Your Vue.js App" />
        </fullScreenContainer>
      </div>
    </template>
    <script> import HelloWorld from "./components/HelloWorld.vue"; import fullScreenContainer from "./components/fullScreenContainer/fullScreenContainer.vue"; export default { name: "App", components: { HelloWorld, fullScreenContainer, }, }; </script>
    <style> #app { font-family: Avenir, Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-align: center; color: #2c3e50; margin-top: 60px; } </style>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MDQ1NjQ1_size_16_color_FFFFFF_t_70_pic_center]

效果很好，这样对于一些开发自适应页面非常容易。

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MDQ1NjQ1_size_16_color_FFFFFF_t_70_pic_center]: /images/20210813/80f8797d47d54f858b31c867947aefe8.png