设置cookie

$(function(){
    function getUrlParam(name) {
        var name = name.toLowerCase();
        var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"); //构造一个含有目标参数的正则表达式对象
        var r = (window.location.search.substr(1).toLowerCase()).match(reg);  //匹配目标参数
        if (r != null){
            return unescape(r[2]);
        }
        return null; //返回参数值
    }

    $.cookie('Utm_rid', getUrlParam("Utm_rid")); 
    $.cookie('Utm_params', 'Utm_rid='+getUrlParam("Utm_rid") + '&Utm_source=' + getUrlParam("Utm_source")); 
})