viewport实现html页面动态缩放/meta viewport/viewport

页面默认缩放比例为1，最小宽度为375px，在小于375px出现水平滚动条的时候重新计算显示比例缩小界面，

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="utf-8">

    <title>viewport</title>

    <meta id="viewport" name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no">

    <script type="text/javascript">

        var winW = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, viewport = document.getElementById("viewport"), scale = 1;

        if (winW <= 320) {

            scale = winW / 375.00;

        }

        else if (winW < 395) {

            scale = (winW - 20) / 375.00;

        }

        if (winW < 395) {

            viewport.content = 'width=device-width,initial-scale=' + scale + ',maximum-scale=' + scale + ',minimum-scale=' + scale + ',user-scalable=no';

        }

    </script>

    <style>

        html, body {

            position: relative;

            height: 100%;

        }

        body {

            background: #eee;

            font-family: Helvetica Neue, Helvetica, Arial, sans-serif;

            font-size: 14px;

            color: #000;

            margin: 0;

            padding: 0;

        }

        .container {

            width: 768px;

            margin: 0 auto;

            height: 300px;

            box-shadow: 0 0 1px #bebebe;

        }

        @media (max-width: 768px) {

            .container {

                width: 576px;

            }

        }

        @media (max-width: 576px) {

            .container {

                width: 375px;

            }

        }

        p {

            word-wrap: break-word;

        }

    </style>

</head>

<body>

<div class="container">

    <h1>viewport</h1>

    <p>AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA</p>

</div>

</body>

</html>

巴特西

viewport实现html页面动态缩放/meta viewport/viewport

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