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来源：3-4 自由编程

慕数据4158169

2021-04-25 10:01:06

相关代码：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        * {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }

        header,
        .tabbar {
            position: fixed;
            left: 0;
            z-index: 1000;
            width: 100%;
        }

        img {
            vertical-align: top;
            height: 100%;
            border: none;
        }

        header {
            top: 0;
            height: 2.5rem;
            background-color: rgba(182, 168, 168, 0.9);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            padding-left: .75rem;
            height: 100%;

        }

        .btn {
            padding-right: .75rem;
            height: 100%;
            display: flex;
            align-items: center;
        }

        .btn input {
            height: 1.6rem;
            width: 4rem;
            color: black;
            font-size: .6rem;
            background-color: rgb(202, 116, 116);
            border-radius: 25px;
            border: 1px solid rgb(202, 116, 116);
        }
    </style>
</head>

<body>
    <header>
        <div class="logo">
            <img src="images/logo.png" alt="">
        </div>
        <div class="btn">
            <input type="button" value="下载APP">
        </div>
    </header>

    <script>
        setRemUnit();

        window.addEventListener('resize', setRemUnit);

        function setRemUnit() {

            var docEl = document.documentElement;

            var ratio = 18.75;

            var viewWidth = docEl.getBoundingClientRect().width || window.innerWidth;

            docEl.style.fontSize = viewWidth / ratio + 'px';

        }
    </script>
</body>

</html>