是否有一种通过jQuery(或不使用)检索查询字符串值的无插件方法?

如果是,怎么办?如果没有,是否有插件可以这样做?


当前回答

Artem Barger回答的改进版本:

function getParameterByName(name) {
    var match = RegExp('[?&]' + name + '=([^&]*)').exec(window.location.search);
    return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
}

有关改进的更多信息,请参阅:http://james.padolsey.com/javascript/bujs-1-getparameterbyname/

其他回答

下面是我将Andy E的优秀解决方案打造成一个成熟的jQuery插件的尝试:

;(function ($) {
    $.extend({      
        getQueryString: function (name) {           
            function parseParams() {
                var params = {},
                    e,
                    a = /\+/g,  // Regex for replacing addition symbol with a space
                    r = /([^&=]+)=?([^&]*)/g,
                    d = function (s) { return decodeURIComponent(s.replace(a, " ")); },
                    q = window.location.search.substring(1);

                while (e = r.exec(q))
                    params[d(e[1])] = d(e[2]);

                return params;
            }

            if (!this.queryStringParams)
                this.queryStringParams = parseParams(); 

            return this.queryStringParams[name];
        }
    });
})(jQuery);

语法为:

var someVar = $.getQueryString('myParam');

两全其美!

更新:2022年1月

使用Proxy()比使用Object.fromEntries()更快,并且更受支持

const params = new Proxy(new URLSearchParams(window.location.search), {
  get: (searchParams, prop) => searchParams.get(prop),
});
// Get the value of "some_key" in eg "https://example.com/?some_key=some_value"
let value = params.some_key; // "some_value"

更新日期:2021年6月

对于需要所有查询参数的特定情况:

const urlSearchParams = new URLSearchParams(window.location.search);
const params = Object.fromEntries(urlSearchParams.entries());

更新:2018年9月

您可以使用URLSearchParams,它很简单,并且具有良好(但不完全)的浏览器支持。

const urlParams = new URLSearchParams(window.location.search);
const myParam = urlParams.get('myParam');

起初的

为此,您不需要jQuery。您可以使用一些纯JavaScript:

function getParameterByName(name, url = window.location.href) {
    name = name.replace(/[\[\]]/g, '\\$&');
    var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, ' '));
}

用法:

// query string: ?foo=lorem&bar=&baz
var foo = getParameterByName('foo'); // "lorem"
var bar = getParameterByName('bar'); // "" (present with empty value)
var baz = getParameterByName('baz'); // "" (present with no value)
var qux = getParameterByName('qux'); // null (absent)

注意:如果参数出现多次(?foo=lorem&foo=ipsum),您将获得第一个值(lorem)。关于这一点没有标准,用法也各不相同,请参见例如这个问题:重复HTTPGET查询键的权威位置。

注意:该函数区分大小写。如果您喜欢不区分大小写的参数名,请在RegExp中添加“i”修饰符

注意:如果您得到了一个无无用转义esint错误,可以替换name=name.replace(/[\[\]]/g,'\\$&');其中name=name。replace(/[[\]]/g,'\\$&')。


这是基于新URLSearchParams规范的更新,以更简洁地实现相同的结果。请参阅下面标题为“URLSearchParams”的答案。

此函数将查询字符串转换为类似JSON的对象,它还处理无值和多值参数:

"use strict";
function getQuerystringData(name) {
    var data = { };
    var parameters = window.location.search.substring(1).split("&");
    for (var i = 0, j = parameters.length; i < j; i++) {
        var parameter = parameters[i].split("=");
        var parameterName = decodeURIComponent(parameter[0]);
        var parameterValue = typeof parameter[1] === "undefined" ? parameter[1] : decodeURIComponent(parameter[1]);
        var dataType = typeof data[parameterName];
        if (dataType === "undefined") {
            data[parameterName] = parameterValue;
        } else if (dataType === "array") {
            data[parameterName].push(parameterValue);
        } else {
            data[parameterName] = [data[parameterName]];
            data[parameterName].push(parameterValue);
        }
    }
    return typeof name === "string" ? data[name] : data;
}

我们对参数[1]执行未定义检查,因为如果变量未定义,decodeURIComponent将返回字符串“undefined”,这是错误的。

用法:

"use strict";
var data = getQuerystringData();
var parameterValue = getQuerystringData("parameterName");

下面是一种快速获取类似于PHP$_get数组的对象的方法:

function get_query(){
    var url = location.search;
    var qs = url.substring(url.indexOf('?') + 1).split('&');
    for(var i = 0, result = {}; i < qs.length; i++){
        qs[i] = qs[i].split('=');
        result[qs[i][0]] = decodeURIComponent(qs[i][1]);
    }
    return result;
}

用法:

var $_GET = get_query();

对于查询字符串x=5&y&z=hello&x=6,这将返回对象:

{
  x: "6",
  y: undefined,
  z: "hello"
}

这些都是很好的答案,但我需要一些更强大的东西,我想你们可能都想拥有我创造的东西。

这是一种简单的库方法,可以对URL参数进行剖析和操作。静态方法有以下子方法,可以在主题URL上调用:

获取主机获取路径获取哈希setHash获取参数获取查询setParam(设置参数)获取参数hasParamremoveParam(删除参数)

例子:

URLParser(url).getParam('myparam1')

var url = "http://www.example.com/folder/mypage.html?myparam1=1&myparam2=2#something";

function URLParser(u){
    var path="",query="",hash="",params;
    if(u.indexOf("#") > 0){
        hash = u.substr(u.indexOf("#") + 1);
        u = u.substr(0 , u.indexOf("#"));
    }
    if(u.indexOf("?") > 0){
        path = u.substr(0 , u.indexOf("?"));
        query = u.substr(u.indexOf("?") + 1);
        params= query.split('&');
    }else
        path = u;
    return {
        getHost: function(){
            var hostexp = /\/\/([\w.-]*)/;
            var match = hostexp.exec(path);
            if (match != null && match.length > 1)
                return match[1];
            return "";
        },
        getPath: function(){
            var pathexp = /\/\/[\w.-]*(?:\/([^?]*))/;
            var match = pathexp.exec(path);
            if (match != null && match.length > 1)
                return match[1];
            return "";
        },
        getHash: function(){
            return hash;
        },
        getParams: function(){
            return params
        },
        getQuery: function(){
            return query;
        },
        setHash: function(value){
            if(query.length > 0)
                query = "?" + query;
            if(value.length > 0)
                query = query + "#" + value;
            return path + query;
        },
        setParam: function(name, value){
            if(!params){
                params= new Array();
            }
            params.push(name + '=' + value);
            for (var i = 0; i < params.length; i++) {
                if(query.length > 0)
                    query += "&";
                query += params[i];
            }
            if(query.length > 0)
                query = "?" + query;
            if(hash.length > 0)
                query = query + "#" + hash;
            return path + query;
        },
        getParam: function(name){
            if(params){
                for (var i = 0; i < params.length; i++) {
                    var pair = params[i].split('=');
                    if (decodeURIComponent(pair[0]) == name)
                        return decodeURIComponent(pair[1]);
                }
            }
            console.log('Query variable %s not found', name);
        },
        hasParam: function(name){
            if(params){
                for (var i = 0; i < params.length; i++) {
                    var pair = params[i].split('=');
                    if (decodeURIComponent(pair[0]) == name)
                        return true;
                }
            }
            console.log('Query variable %s not found', name);
        },
        removeParam: function(name){
            query = "";
            if(params){
                var newparams = new Array();
                for (var i = 0;i < params.length;i++) {
                    var pair = params[i].split('=');
                    if (decodeURIComponent(pair[0]) != name)
                          newparams .push(params[i]);
                }
                params = newparams;
                for (var i = 0; i < params.length; i++) {
                    if(query.length > 0)
                        query += "&";
                    query += params[i];
                }
            }
            if(query.length > 0)
                query = "?" + query;
            if(hash.length > 0)
                query = query + "#" + hash;
            return path + query;
        },
    }
}

document.write("Host: " + URLParser(url).getHost() + '<br>');
document.write("Path: " + URLParser(url).getPath() + '<br>');
document.write("Query: " + URLParser(url).getQuery() + '<br>');
document.write("Hash: " + URLParser(url).getHash() + '<br>');
document.write("Params Array: " + URLParser(url).getParams() + '<br>');
document.write("Param: " + URLParser(url).getParam('myparam1') + '<br>');
document.write("Has Param: " + URLParser(url).hasParam('myparam1') + '<br>');

document.write(url + '<br>');

// Remove the first parameter
url = URLParser(url).removeParam('myparam1');
document.write(url + ' - Remove the first parameter<br>');

// Add a third parameter
url = URLParser(url).setParam('myparam3',3);
document.write(url + ' - Add a third parameter<br>');

// Remove the second parameter
url = URLParser(url).removeParam('myparam2');
document.write(url + ' - Remove the second parameter<br>');

// Add a hash
url = URLParser(url).setHash('newhash');
document.write(url + ' - Set Hash<br>');

// Remove the last parameter
url = URLParser(url).removeParam('myparam3');
document.write(url + ' - Remove the last parameter<br>');

// Remove a parameter that doesn't exist
url = URLParser(url).removeParam('myparam3');
document.write(url + ' - Remove a parameter that doesn\"t exist<br>');