兼容FF,IE,Chrome的js离开或刷新页面检测

<!DOCTYPE html>
<html>
<head>
<script>
  function closeIt()
  {
    return "Any string value here forces a dialog box to \n" + 
         "appear before closing the window.";
  }
  window.onbeforeunload = closeIt;
</script>
</head>
<body>
  <a href="http://www.microsoft.com">Click here to navigate to 
      www.microsoft.com</a>
</body>
</html>

兼容FF,IE,Chrome的js离开或刷新页面检测,关键的部分是要有return.

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原文地址：https://www.cnblogs.com/fumj/p/2834039.html