js url参数的获取和设置以及删除

 

//获取url参数的值：name是参数名        function getQueryString(name) {            var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");            var r = window.location.search.substr(1).match(reg);            if (r != null) {                return (r[2]);            }            return null;        } //设置url参数值，ref参数名,value新的参数值        function changeURLPar(url, ref, value)        {            var str = "";            if (url.indexOf('?') != -1)                str = url.substr(url.indexOf('?') + 1);            else                return url + "?" + ref + "=" + value;            var returnurl = "";            var setparam = "";            var arr;            var modify = "0";            if (str.indexOf('&') != -1) {                arr = str.split('&');                for (i in arr) {                    if (arr[i].split('=')[0] == ref) {                        setparam = value;                        modify = "1";                    }                    else {                        setparam = arr[i].split('=')[1];                    }                    returnurl = returnurl + arr[i].split('=')[0] + "=" + setparam + "&";                }                returnurl = returnurl.substr(0, returnurl.length - 1);                if (modify == "0")                    if (returnurl == str)                        returnurl = returnurl + "&" + ref + "=" + value;            }            else {                if (str.indexOf('=') != -1) {                    arr = str.split('=');                    if (arr[0] == ref) {                        setparam = value;                        modify = "1";                    }                    else {                        setparam = arr[1];                    }                    returnurl = arr[0] + "=" + setparam;                    if (modify == "0")                        if (returnurl == str)                            returnurl = returnurl + "&" + ref + "=" + value;                }                else                    returnurl = ref + "=" + value;            }            return url.substr(0, url.indexOf('?')) + "?" + returnurl;        }        //删除参数值        function delQueStr(url, ref) {            var str = "";            if (url.indexOf('?') != -1) {                str = url.substr(url.indexOf('?') + 1);            }            else {                return url;            }            var arr = "";            var returnurl = "";            var setparam = "";            if (str.indexOf('&') != -1) {                arr = str.split('&');                for (i in arr) {                    if (arr[i].split('=')[0] != ref) {                        returnurl = returnurl + arr[i].split('=')[0] + "=" + arr[i].split('=')[1] + "&";                    }                }                return url.substr(0, url.indexOf('?')) + "?" + returnurl.substr(0, returnurl.length - 1);            }            else {                arr = str.split('=');                if (arr[0] == ref) {                    return url.substr(0, url.indexOf('?'));                }                else {                    return url;                }            }        }