function getByClass(oparent,sClass) {
var aEle = oparent.getElementsByTagName("*");
var asult = [];
var re = new RegExp("\\b"+ sClass + "\\b","i");
for (var i = 0;i < aEle.length;i++) {
if (re.test(aEle[i].className)) {
asult.push(aEle[i]);
}
}
return asult;
};有多个class也可以找到
