jquery激活数组对象的click

$(function(){
var clickFun = function(){
alert($(this).val());
}
var arr = new Array('button1','button2','button3','button4','button5');
for(var i in arr){
if($('#'+arr[i]).length)
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$('#'+arr[i]).click(clickFun);
}
});
<button id="button1" value="11111" >button1</button>
<button id="button2" value="22222" >button2</button>
<button id="button3" value="33333" >button3</button>