取消a标签的默认行动（跳转到href）

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
   <a id="link" href="http://www.baidu.com">百度</a>
   <script>
     var link = document.getElementById('link');
     link.onclick = function () {
       alert('点击我了');

       // 取消a标签的默认行为（跳转到href）
       return false;
     }
   </script>
</body>
</html>

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