统一获取id

1 <div id="box1"></div>
2 <div id="box2"></div>
3 <div id="box3"></div>
4 <div id="box4"></div>

1 function getId (arrId) {
2     if (arrId.length == 0) return;
3     for (var i=0,len=arrId.length; i<len; i++) {
4         objId[arrId[i]] = document.getElementById(arrId[i]);
5     }
6     return objId;
7 }
8 
9 getId(["box1","box2","box3","box4"]);