杂园日记-获取URL参数

function getUrlParams(name, url){
        var locationUrl = window.location.search;
        if(url){
            var s =url.indexOf("?");
            locationUrl = url.substring(s);
        }
        var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
        var r = locationUrl.substr(1).match(reg);
        if(r!=null) return unescape(r[2]);
        return null;
    };