js中如何判断按钮是否被点击了

firfox版:

<HTML>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<HEAD>
<TITLE></TITLE>
<script>
document.onclick=function(e){
var evt=e||window.event;
var tar=evt.target||evt.srcElement;
if( (tar.tagName.toLowerCase()=="input"&&tar.type=="button") || tar.tagName.toLowerCase()=="button"){
alert("你点击的是一个按钮")
}
}
</script>
</HEAD>

<BODY>
<input id="button1" type="button" value="1111"/>
<input id="button2" type="button" value="2222"/>
<input id="button3" type="button" value="3333"/>
<input id="button4" type="button" value="4444"/>
</BODY>
</HTML>

 

google 浏览器版:

 

<HTML>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<HEAD>
<TITLE></TITLE>
<script>
document.onclick=function()

{ var obj = event.srcElement;

if(obj.type == "button"){

alert(obj.id); }

}
</script>
</HEAD>

<BODY>
<input id="button1" type="button" value="1111"/>
<input id="button2" type="button" value="2222"/>
<input id="button3" type="button" value="3333"/>
<input id="button4" type="button" value="4444"/>
</BODY>
</HTML>

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