js 简单getByClass得封装

function getByClass(oParent,sClass){
				var elems = oParent.getElementsByTagName("*");
				var arr = [];
				for(var i = 0; i < elems.length; i++ ){
					if(elems[i].className == sClass ){
						arr.push(elems[i]);
					}
				}

				return arr;
			}