js采用正则表达式获取地址栏参数

getQueryString:function(name) {
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
    var r = decodeURI(decodeURI(window.location.search)).substr(1).match(reg);
    if(r!=null)return  unescape(r[2]); return null;
}