<div id="box">

<input id="btn1" value="按钮一" type="button" onClick="ss()">

<input id="btn2" value="按钮二" type="button">

<input id="btn3" value="按钮三" type="button">

</div>

<script type="text/javascript">

function ss(event){

alert(event.target.nodeName)

}

function xx(event){

alert(event.target.nodeName)

}

var eventUtil={

//添加句柄

addHandler:function(el,type,handler){

if(el.addEventListener){

el.addEventListener(type,handler,false)

}else if(el.attachEvent){

el.attachEvent('on'+type,handler)

}else{

el['on'+type]=handler//用.点的地方都可以用中括号[]

}

},

//删除句柄

removeHandler:function(el,type,handler){

if(el.removeEventListener){

el.removeEventListener(type,handler,false)

}else if(el.detachEvent){

el.detachEvent('on'+type,handler)

}else{

el['on'+type]=null//用.点的地方都可以用中括号[]

}

}

}

eventUtil.addHandler(btn3,'click',ss)

eventUtil.addHandler(box,'click',xx)

</script>