js封装：获取class类名

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