js 实现新手引导页思路

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<!DOCTYPE html>
<html>

<head>
  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  <meta charset="utf-8">
  <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport">
  <meta content="yes" name="apple-mobile-web-app-capable">
  <meta content="black" name="apple-mobile-web-app-status-bar-style">
  <meta content="telephone=no" name="format-detection">
  <title>新手指导页</title>
  <style>
    html,body {
      width: 100%;
      height: 100%;
      margin: 0;
      overflow: auto;
    }
    #cloneBox {
      border: 1px solid #000;
      box-sizing: border-box;
      height: 150%;
      padding: 20px;
      position: relative;
    }
    .redBox {
      width: 100px;
      height: 100px;
      background: red;
      margin-bottom: 20px;
    }
    #mb {
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.3);
      position: absolute;
      left: 0;
      top: 0;
    }
  </style>
</head>

<body>
  <div id="cloneBox">
    <h4>1212</h4>
    <h2>32323</h2>
    <div class="redBox" id="redBox"></div>
    <button id="btn" onClick='createMB()'>指导</button>
  </div>
</body>
</html>
<script type="text/javascript">
    const redBox = document.getElementById('btn')
    const cloneBox = document.getElementById('cloneBox')
    const bodyEle = document.body

    // 元素距离上 左 的距离

    let left_ = redBox.offsetLeft
    let top_ =  redBox.offsetTop

    let that = this
    function createMB() {
      let Div = document.createElement('div')
      Div.id = 'mb'
      Div.onclick = function() {
        that.close()
      }
      const newEle = redBox.cloneNode(true)
      newEle.style.position = 'absolute'
      newEle.style.left = left_ + 'px'
      newEle.style.top = top_ + 'px'
      Div.appendChild(newEle)
      cloneBox.appendChild(Div)
    }
    function close() {
      const mb = document.getElementById('mb')
      cloneBox.removeChild(mb)
    }
    createMB()
    // const oldEle = document.getElementById('cloneBox')
    // const newEle = oldEle.cloneNode(true)
    // document.body.appendChild(newEle)
</script>
js 实现新手引导页 思路

js 实现新手引导页思路
