js代码：

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

URL的参数&参数名1=XXXX&参数名2=XXXX&参数名3=XXXX

alert(GetQueryString("参数名1"));
alert(GetQueryString("参数名2"));
alert(GetQueryString("参数名3"));

jquery 代码：

把下面代码。放到js文件中

/*** jQuery.query - Query String Modification and Creation for jQuery* Written by Blair Mitchelmore (blair DOT mitchelmore AT gmail DOT com)* Licensed under the WTFPL (http://sam.zoy.org/wtfpl/).* Date: 2009/8/13** @author Blair Mitchelmore* @version 2.1.6***/
new function(settings) { // Various Settingsvar $separator = settings.separator || '&';var $spaces = settings.spaces === false ? false : true;var $suffix = settings.suffix === false ? '' : '[]';var $prefix = settings.prefix === false ? false : true;var $hash = $prefix ? settings.hash === true ? "#" : "?" : "";var $numbers = settings.numbers === false ? false : true;jQuery.query = new function() {var is = function(o, t) {return o != undefined && o !== null && (!!t ? o.constructor == t : true);};var parse = function(path) {var m, rx = /\[([^[]*)\]/g, match = /^([^[]+?)(\[.*\])?$/.exec(path), base = match[1], tokens = [];while (m = rx.exec(match[2])) tokens.push(m[1]);return [base, tokens];};var set = function(target, tokens, value) {var o, token = tokens.shift();if (typeof target != 'object') target = null;if (token === "") {if (!target) target = [];if (is(target, Array)) {target.push(tokens.length == 0 ? value : set(null, tokens.slice(0), value));} else if (is(target, Object)) {var i = 0;while (target[i++] != null);target[--i] = tokens.length == 0 ? value : set(target[i], tokens.slice(0), value);} else {target = [];target.push(tokens.length == 0 ? value : set(null, tokens.slice(0), value));}} else if (token && token.match(/^\s*[0-9]+\s*$/)) {var index = parseInt(token, 10);if (!target) target = [];target[index] = tokens.length == 0 ? value : set(target[index], tokens.slice(0), value);} else if (token) {var index = token.replace(/^\s*|\s*$/g, "");if (!target) target = {};if (is(target, Array)) {var temp = {};for (var i = 0; i < target.length; ++i) {temp[i] = target[i];}target = temp;}target[index] = tokens.length == 0 ? value : set(target[index], tokens.slice(0), value);} else {return value;}return target;};var queryObject = function(a) {var self = this;self.keys = {};if (a.queryObject) {jQuery.each(a.get(), function(key, val) {self.SET(key, val);});} else {jQuery.each(arguments, function() {var q = "" + this;q = q.replace(/^[?#]/,''); // remove any leading ? || #q = q.replace(/[;&]$/,''); // remove any trailing & || ;if ($spaces) q = q.replace(/[+]/g,' '); // replace +'s with spacesjQuery.each(q.split(/[&;]/), function(){var key = decodeURIComponent(this.split('=')[0] || "");var val = decodeURIComponent(this.split('=')[1] || "");if (!key) return;if ($numbers) {if (/^[+-]?[0-9]+\.[0-9]*$/.test(val)) // simple float regexval = parseFloat(val);else if (/^[+-]?[0-9]+$/.test(val)) // simple int regexval = parseInt(val, 10);}val = (!val && val !== 0) ? true : val;if (val !== false && val !== true && typeof val != 'number')val = val;self.SET(key, val);});});}return self;};queryObject.prototype = {queryObject: true,has: function(key, type) {var value = this.get(key);return is(value, type);},GET: function(key) {if (!is(key)) return this.keys;var parsed = parse(key), base = parsed[0], tokens = parsed[1];var target = this.keys[base];while (target != null && tokens.length != 0) {target = target[tokens.shift()];}return typeof target == 'number' ? target : target || "";},get: function(key) {var target = this.GET(key);if (is(target, Object))return jQuery.extend(true, {}, target);else if (is(target, Array))return target.slice(0);return target;},SET: function(key, val) {var value = !is(val) ? null : val;var parsed = parse(key), base = parsed[0], tokens = parsed[1];var target = this.keys[base];this.keys[base] = set(target, tokens.slice(0), value);return this;},set: function(key, val) {return this.copy().SET(key, val);},REMOVE: function(key) {return this.SET(key, null).COMPACT();},remove: function(key) {return this.copy().REMOVE(key);},EMPTY: function() {var self = this;jQuery.each(self.keys, function(key, value) {delete self.keys[key];});return self;},load: function(url) {var hash = url.replace(/^.*?[#](.+?)(?:\?.+)?$/, "$1");var search = url.replace(/^.*?[?](.+?)(?:#.+)?$/, "$1");return new queryObject(url.length == search.length ? '' : search, url.length == hash.length ? '' : hash);},empty: function() {return this.copy().EMPTY();},copy: function() {return new queryObject(this);},COMPACT: function() {function build(orig) {var obj = typeof orig == "object" ? is(orig, Array) ? [] : {} : orig;if (typeof orig == 'object') {function add(o, key, value) {if (is(o, Array))o.push(value);elseo[key] = value;}jQuery.each(orig, function(key, value) {if (!is(value)) return true;add(obj, key, build(value));});}return obj;}this.keys = build(this.keys);return this;},compact: function() {return this.copy().COMPACT();},toString: function() {var i = 0, queryString = [], chunks = [], self = this;var encode = function(str) {str = str + "";if ($spaces) str = str.replace(/ /g, "+");return encodeURIComponent(str);};var addFields = function(arr, key, value) {if (!is(value) || value === false) return;var o = [encode(key)];if (value !== true) {o.push("=");o.push(encode(value));}arr.push(o.join(""));};var build = function(obj, base) {var newKey = function(key) {return !base || base == "" ? [key].join("") : [base, "[", key, "]"].join("");};jQuery.each(obj, function(key, value) {if (typeof value == 'object') build(value, newKey(key));elseaddFields(chunks, newKey(key), value);});};build(this.keys);if (chunks.length > 0) queryString.push($hash);queryString.push(chunks.join($separator));return queryString.join("");}};return new queryObject(location.search, location.hash);};
}(jQuery.query || {}); // Pass in jQuery.query as settings object

如果想获取test，则可以引入插件后，
用如下方法获取：
var test = $.query.get('test');如果参数有多个相同的名称 ，则可以这样：
var arr = $.query.get('testy');
输出：   [ 值1 ,   值2,   值3...]如果要获取多个相同名称中的某一个，可以这样：
var arrayElement = $.query.get('testy[1]');此插件不仅能获取参数，也能设置参数。设置一个参数：
var newUrl = $.query.set("section", 5).toString();
输出   ： "?section=5"设置两个参数：
var newUrl = $.query.set("section", 5).set("action", "do").toString();
输出 :   "?action=do§ion=5"删除一个参数：
var oldQueryAgain = $.query.REMOVE("type");清空所有参数：
var emptyQuery = $.query.empty();复制所有参数：
var stillTheSame = $.query.copy();