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加载网页旋转方向

需求描述​

客户提出需求，想加载网页的时候能够指定方向，为了适配不同方向放置的设备(比如倒挂的电视)，下面是用iframe实现的思路，我们把网页加载到iframe中，然后根据传入的方向进行旋转。

实现代码​

<!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,chrome=1">
  <meta name="renderer" content="webkit">
  <title>Document</title>
  <style>
    html,body {
      margin: 0;
      padding: 0;
      background: #ffffff;
      width: 100% !important;
      height: 100% !important;
    }

    body>iframe {
      border: none;
      position: fixed;
      top: 0;
      left: 0;
    }
  </style>
</head>
<body>

</body>
</html>
<script>
  let url = "https://www.baidu.com/"
  let direction = "bottom"

  window.onload = function () {
    if (["#left", "#top", "#right", "#bottom"].includes(window.location.hash)) {
      direction = window.location.hash.substring(1)
    }

    let clientWidth = document.body.clientWidth
    let clientHeight = document.body.clientHeight

    console.log('clientWidth', clientWidth)
    console.log('clientHeight', clientHeight)

    let width = document.body.clientWidth
    let height = document.body.clientHeight
    let rotate = 0
    let offset = 0

    if (direction === "left") {
      width = document.body.clientHeight
      height = document.body.clientWidth
      offset = parseInt((width - height) / 2)
      rotate = 90

    } else if (direction === "right") {
      width = document.body.clientHeight
      height = document.body.clientWidth
      offset = parseInt((width - height) / 2)
      rotate = 270

    } else if (direction === "top") {
      rotate = 180
    }

    let iframe = document.createElement('iframe')
    iframe.src = url
    iframe.style = "-webkit-transform: rotate("+(rotate)+"deg) !important;transform:rotate("+rotate+"deg) !important;left:"+(-offset)+"px !important;top:"+(offset)+"px !important;width: "+(width)+"px;height:"+(height)+"px;"
    document.body.appendChild(iframe)
  }
</script>