js 通过class来获取元素

 1 function getClass(obj,aClass){
 2     var oParent = obj.getElementsByTagName(‘*‘);
 3     var result = [];
 4     for(var i=0;i<oParent.length;i++){
 5         var aClassName = oParent[i].className.split(‘ ‘);
 6         for(var j=0;j<aClassName.length;j++){
 7             if(aClassName[j] == aClass){
 8                 result.push(oParent[i]);
 9             }
10         }
11     }
12     return result;
13 }