js自动调试rem尺寸 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        html,body{
            margin: 0;
            padding: 0;
        }
        .box{
            font-size: 0;
        }
        .app{
            display: inline-block;
            width: 3.75rem;
            height: 3.75rem;
            font-size: 0.2rem;
            border: 1px solid #000;
            box-sizing: border-box;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="app">123</div>
        <div class="app">456</div>
    </div>
    <script>
        let html = document.querySelector('html');  /*获取html元素*/
        let width = html.getBoundingClientRect().width; /*获取html元素的高*/
        /*设置html的font-size 根据750px宽来设置的 */
        html.style.fontSize = width/750*100+'px';
    </script>
</body>
</html>
posted @ 2021-01-05 12:56  火烧云Z  阅读(71)  评论(0)    收藏  举报