javascript捕获事件event

 var e = e ? e : window.event;
 window.event ? window.event.cancelBubble = true : e.stopPropagation();

<button type="button" onclick="showInfo()">button</button>
<script type="text/javascript">
    function showInfo(){
         var e = e ? e : window.event;
         window.event ? window.event.cancelBubble = true : e.stopPropagation();
    }

</script>

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