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;

 }