js getByClass函数封装

 function getByClass(oParent, sClass)
 {
  var aEle=oParent.getElementsByTagName('*');
  var aResult=[];
  var i=0;

  for(i=0;i<aEle.length;i++)
  {
   if(aEle[i].className==sClass)
   {
    aResult.push(aEle[i]);
   }
  }

  return aResult;
 }