1px

Retina屏的移动设备如何实现真正1px的线？

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no">

    <title></title>

</head>

<body>

    <div style="width:100px;height:0.5px;background:red;margin:10px;"></div>

    <div style="width:100px;height:1px;background:red;margin:10px;"></div>

    <div style="width:100px;height:1px;background:red;margin:10px;-webkit-transform: scaleY(0.5);transform:scaleY(0.5);-webkit-transform-origin:0 0;transform-origin: 0 0;"></div>

</body>

</html>

1px

if (window.devicePixelRatio && devicePixelRatio >= 2) {

  var testElem = document.createElement('div');

  testElem.style.border = '.5px solid transparent';

  document.body.appendChild(testElem);

  if (testElem.offsetHeight == 1)

  {

    document.querySelector('html').classList.add('hairlines');

  }

  document.body.removeChild(testElem);

}

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