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<script>
function clickAction(){
switch(this.id){
case 'btnId_01':
//your code
alert(this.id);
break;
case 'btnId_02':
//your code
alert(this.id);
break;
case 'btnId_03':
//your code
alert(this.id);
break;
}
}
window.onload = function(){
var arr = document.getElementsByTagName('input');
for(var i = 0 ; arr[i]; i++){
if(arr[i].type == 'button'){
arr[i].onclick = clickAction;
}
}
};
</script>
<input type="button" value="button1" id="btnId_01"/>
<input type="button" value="button1" id="btnId_02"/>
<input type="button" value="button1" id="btnId_03"/>