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js monitors IE Firefox browser close, refresh, rollback, and forward events_javascript skills

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2016-05-16 16:41:191560browse
<html>
  <head>
    <title>test</title>
      <script language ="javaScript">
        <!--关闭浏览器 -->
        var flag = true;
        window.onbeforeunload = function () {
          if (flag) {
            var evt = window.event || arguments[0];
            var userAgent = navigator.userAgent;
            if (userAgent.indexOf("MSIE") > 0) {
              var n = window.event.screenX - window.screenLeft;
              var b = n > document.documentElement.scrollWidth - 20;
              if (b && window.event.clientY < 0 || window.event.altKey) {
                window.event.returnValue = ("该操作将会导致非正常退出系统(正确退出系统方式：点击退出系统按钮)，您是否确认&#63;");
              }else {
                return ("该操作将会导致非正常退出系统(正确退出系统方式：点击退出系统按钮)，您是否确认&#63;");
              }
            }else if (userAgent.indexOf("Firefox") > 0) {
               return ("该操作将会导致非正常退出系统(正确退出系统方式：点击退出系统按钮)，您是否确认&#63;");
            }
          }
        }
     </script>
  </head>
  <body>
     dengyang
  <body>
</html>
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