Rem是相对于根元素font-size大小的单位
记inphone5屏幕宽度是 320px font-size16px 1rem=16px
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1.0">
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<title>smiledemo</title>
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<style>
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.test{
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20rem;
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height: 10rem;
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background-color:bisque;
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text-align: center;
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}
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.hello{
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color: red;
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font-size: 1rem;
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}
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</style>
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</head>
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<body>
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<div id="app"></div>
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<div class="test">
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<p class="hello" >hello wangyawei</p>
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</div>
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</body>
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</html>
于是我们在js中写适配方案3行代码即可搞定
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<script>
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let htmlwidth=document.documentElement.clientWidth||document.body.clientWidth;
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console.log(htmlwidth);
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let htmlDom=document.getElementsByTagName("html")[0];
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//以imphone5的屏幕作为适配 320/16=20
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htmlDom.style.fontSize=htmlwidth/20+"px";
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</script>
可以看出完美适配，font-size变为了18.75px