获取url链接上的参数值的函数

function getUrlParam(name){
    var reg     = new RegExp('(^|&)' + name + '=([^&]*)(&|$)');
    var result  = window.location.search.substr(1).match(reg);
    return result ? decodeURIComponent(result[2]) : null;
}function getUrlParam(name){
    var reg     = n