从0到1搭建一款页面自适应组件（Vue.js）-技术圈

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>

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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