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<!DOCTYPE html> <html> <head> <script> function whichElement(e) { var targ; if (!e) { var e = window.event; } if (e.target) { targ = e.target; } else if (e.srcElement) { targ = e.srcElement; } var tname; tname = targ.tagName; alert("You clicked on a " + tname + " element."); } </script> </head> <body onmousedown="whichElement(event)"> <p>单击文档中的某处。 警告框将警告您单击的元素的名称。</p> <h3>这是一个标题</h3> <img border="0" src="smiley.gif" alt="笑脸" width="32" height="32"> <p>这是一个段落。</p> </body> </html>