DOM getByClass封装

function getByClass(oParent,sClass)
{
	var aResult = [];
	var aEle = oParent.getElementsByTagName("*");
	
	for(var i = 0 ; i < aEle.length;i++)
	{
		fi(aEle[i].className == sClass)
		{
			aResult.push(aEle[i]);
		}
	}
	return aResult;
}

　　oParent 是父节点