lovecoding
/
VIP28


			
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							<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      touch-action: none
    }

    body {
      margin: 0;
    }

    .container {
      width: 100%;
      overflow: hidden;
      position: relative;
    }

    .layer-title {
      width: 100%;
      margin: 50px 0;
      text-align: center;
    }

    .layer-action {
      position: absolute;
      bottom: 20px;
      width: 100%;
      text-align: center;
    }

    .btn {
      background-color: #08c;
      border: 0;
      color: #fff;
      height: 30px;
      line-height: 30px;
      width: 100px;
    }

    #underLayer {
      background-color: #eee;
      width: 90%;
      height: 500px;
      line-height: 500px;
      margin: 30px auto 1000px;
      text-align: center;
    }

    #popupLayer {
      /*display: none;*/
      background-color: #fff;
      width: 80%;
      height: 200px;
      position: fixed;
      top: 50%;
      left: 50%;
      margin-left: -40%;
      margin-top: -100px;
      z-index: 1;
    }

    #bgMask {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: rgba(0, 0, 0, 0.6);
    }
  </style>
</head>

<body>
  <div id="container">
    <div id="underLayer">底层元素</div>
    <div id="popupLayer">
      <div class="layer-title">弹出层</div>
      <div class="layer-action">
        <button class="btn" id="closePopup">关闭</button>
      </div>
    </div>
  </div>
  <div id="bgMask"></div>
  <script type="text/javascript">
    var oClose = document.querySelector('#closePopup')
    var oUnder = document.querySelector('#underLayer')
    oClose.ontouchstart = function (e) {
      /* 阻止事件默认行为 */
      e.preventDefault()
      document.querySelector('#popupLayer').style.display = 'none'
      document.querySelector('#bgMask').style.display = 'none'
    }

    // oClose.onclick = function(){
    //   document.querySelector('#popupLayer').style.display = 'none'
    //   document.querySelector('#bgMask').style.display = 'none'
    // }
    oUnder.onclick = function () {
      alert('click')
    }
    /* 
    出现点透事件的条件如下:
    有两层重叠的元素
    上面的元素带有touch事件  下面的元素是click事件 或者是一个a标签
      事件流-> touch  -> click
    上层元素点击需要触发display:none


    上层元素点击的时候触发了click事件
    因为click事件会有延迟时间  而touch会立即触发  所以当点击了上面的事件会触发下面的click、

    解决方案：
    1、把上层的事件也换成click  不会立即触发  都有延迟
    2、在上层元素中 通过event.preventDefault()阻止事件默认行为
    */
  </script>
</body>

</html>