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console 命令行工具 X clear 

                    

                        
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console

            
function whichElement(e)
{
var targ
if (!e) var e = window.event
if (e.target) targ = e.target
else if (e.srcElement) targ = e.srcElement
if (targ.nodeType == 3) // defeat Safari bug
   targ = targ.parentNode
var tname
tname=targ.tagName
alert("You clicked on a " + tname + " element.")
}

            
<body onmousedown="whichElement(event)"> 
 <p>在文档中点击某个位置。消息框会提示出您所点击的标签的名称。</p> 
 <h3>这是标题</h3> 
 <p>这是段落。</p> 
 <img src="/i/eg_mouse2.jpg">  
</body>