纯JS实现弹出框

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
    <meta name="renderer" content="webkit" />
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>纯JS实现弹出框</title>
    <style type="text/css">
        /*弹出层*/
        .popPosition {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
        }
        #pop-container {
            display: none;
            z-index: 999;
        }
        /*遮盖层*/
        #cover-tier {
            background-color: #D9D9D9;
            opacity: 0.5;
        }
        /*弹出层内容*/
        #pop-tier {
            width: 100px;
            height: 50px;
            border: 5px solid #C3C3C3;
            background-color: #fff;
            margin: auto;
            text-align: center;
        }
        #pop-tier>p {
            margin-top: 10px;
        }
    </style>
</head>
<body>
    <button id="btn">点击弹出层</button>
    <div id="pop-container">
        <div id="cover-tier"></div>
        <div id="pop-tier">
            <p id="alert">弹出框内容</p>
        </div>
    </div>
    <script type="text/javascript">
      function temp(id) {
          return document.getElementById(id);
      }
 
      // 点击按钮出现弹出层
      temp('btn').onclick = function() {
         //temp("alert").innerHTML = msg;
         temp('pop-container').style.display = 'block';
      };
      // 弹出层隐藏
      temp('pop-tier').onclick = function() {
          temp('pop-container').style.display = 'none';
      };
      temp('cover-tier').onclick = function() {
          temp('pop-container').style.display = 'none';
      };
    </script>
</body>
</html>

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