1px/demos/flexible/4-dynamic-scale.html at master · freedomcly/1px · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,minimum-scale=1,width=device-width">
    <style>
        .hairline {
            border-bottom: 1px solid black;
        }
        .block {
            width: 100px;
            height: 100px;
            background-color: aquamarine;
        }
    </style>
    <script>
    var dpr = window.devicePixelRatio || 1
    var scale = 1 / dpr
    var content = 'width=device-width, initial-scale=' + scale + ', minimum-scale=' + scale + ', maximum-scale=' + scale + ', user-scalable=no'
    var viewportEl = document.querySelector('meta[name="viewport"]')

    if (viewportEl) {
      viewportEl.setAttribute('content', content)
    } else {
      viewportEl = document.createElement('meta')
      viewportEl.setAttribute('name', 'viewport')
      viewportEl.setAttribute('content', content)
      document.head.appendChild(viewportEl)
    }
    </script>
</head>
<body>
<!-- hairline 生效，px 单位在不同手机上大小不一 -->
<div class="hairline"></div>
<div class="block"></div>
</body>
</html>