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

ES2015(ES6)

getQueryStringParams = query => {
    return query
        ? (/^[?#]/.test(query) ? query.slice(1) : query)
            .split('&')
            .reduce((params, param) => {
                    let [key, value] = param.split('=');
                    params[key] = value ? decodeURIComponent(value.replace(/\+/g, ' ')) : '';
                    return params;
                }, {}
            )
        : {}
};

没有jQuery

var qs = (function(a) {
    if (a == "") return {};
    var b = {};
    for (var i = 0; i < a.length; ++i)
    {
        var p=a[i].split('=', 2);
        if (p.length == 1)
            b[p[0]] = "";
        else
            b[p[0]] = decodeURIComponent(p[1].replace(/\+/g, " "));
    }
    return b;
})(window.location.search.substr(1).split('&'));

URL如下?topic=123&name=query+string,将返回以下内容:

qs["topic"];    // 123
qs["name"];     // query string
qs["nothere"];  // undefined (object)

Google方法

撕扯谷歌的代码,我找到了他们使用的方法:getUrlParameters

function (b) {
    var c = typeof b === "undefined";
    if (a !== h && c) return a;
    for (var d = {}, b = b || k[B][vb], e = b[p]("?"), f = b[p]("#"), b = (f === -1 ? b[Ya](e + 1) : [b[Ya](e + 1, f - e - 1), "&", b[Ya](f + 1)][K](""))[z]("&"), e = i.dd ? ia : unescape, f = 0, g = b[w]; f < g; ++f) {
        var l = b[f][p]("=");
        if (l !== -1) {
            var q = b[f][I](0, l),
                l = b[f][I](l + 1),
                l = l[Ca](/\+/g, " ");
            try {
                d[q] = e(l)
            } catch (A) {}
        }
    }
    c && (a = d);
    return d
}

这是模糊的,但可以理解。它无法工作,因为某些变量未定义。

他们开始在url上查找参数?并且还从散列#中。然后,对于每个参数,它们以等号b[f][p](“=”)分割(看起来像indexOf,它们使用字符的位置来获取键/值)。拆分后,他们检查参数是否有值,如果有值,则存储d的值,否则继续。

最后返回对象d,处理转义和+符号。这个对象和我的一样,它有相同的行为。


我的方法作为jQuery插件

(function($) {
    $.QueryString = (function(paramsArray) {
        let params = {};

        for (let i = 0; i < paramsArray.length; ++i)
        {
            let param = paramsArray[i]
                .split('=', 2);
            
            if (param.length !== 2)
                continue;
            
            params[param[0]] = decodeURIComponent(param[1].replace(/\+/g, " "));
        }
            
        return params;
    })(window.location.search.substr(1).split('&'))
})(jQuery);

用法

//Get a param
$.QueryString.param
//-or-
$.QueryString["param"]
//This outputs something like...
//"val"

//Get all params as object
$.QueryString
//This outputs something like...
//Object { param: "val", param2: "val" }

//Set a param (only in the $.QueryString object, doesn't affect the browser's querystring)
$.QueryString.param = "newvalue"
//This doesn't output anything, it just updates the $.QueryString object

//Convert object into string suitable for url a querystring (Requires jQuery)
$.param($.QueryString)
//This outputs something like...
//"param=newvalue&param2=val"

//Update the url/querystring in the browser's location bar with the $.QueryString object
history.replaceState({}, '', "?" + $.param($.QueryString));
//-or-
history.pushState({}, '', "?" + $.param($.QueryString));

性能测试(针对正则表达式方法的拆分方法)(jsPerf)

准备代码:方法声明

拆分测试代码

var qs = window.GetQueryString(query);

var search = qs["q"];
var value = qs["value"];
var undef = qs["undefinedstring"];

Regex测试代码

var search = window.getParameterByName("q");
var value = window.getParameterByName("value");
var undef = window.getParameterByName("undefinedstring");

在Windows Server 2008 R2/7 x64上的Firefox 4.0 x86中测试

拆分方法:最快144780±2.17%Regex方法:13891±0.85%|90%慢

其他回答

我经常使用正则表达式,但并非如此。

在我的应用程序中读取一次查询字符串,并从所有键/值对构建一个对象,对我来说似乎更容易、更有效,比如:

var search = function() {
  var s = window.location.search.substr(1),
    p = s.split(/\&/), l = p.length, kv, r = {};
  if (l === 0) {return false;}
  while (l--) {
    kv = p[l].split(/\=/);
    r[kv[0]] = decodeURIComponent(kv[1] || '') || true;
  }
  return r;
}();

对于URL,如http://example.com?param1=val1&param2=val2您可以稍后在代码中以search.param1和search.param2的形式获取它们的值。

可靠地做这件事比一开始想象的要复杂得多。

其他答案中使用的location.search很脆弱,应该避免使用-例如,如果有人搞砸了,并在?查询字符串。在我看来,URL在浏览器中自动转义的方式有很多种,这使得decodeURIComponent非常强制性。许多查询字符串是由用户输入生成的,这意味着对URL内容的假设非常糟糕。包括非常基本的东西,比如每个键都是唯一的,甚至有一个值。

为了解决这个问题,这里提供了一个可配置的API,并提供了健康的防御性编程。请注意,如果您愿意对某些变量进行硬编码,或者如果输入不能包含hasOwnProperty等,则可以将其大小减半。

版本1:返回包含每个参数的名称和值的数据对象。它有效地消除了重复,并始终尊重从左到右找到的第一个。

function getQueryData(url, paramKey, pairKey, missingValue, decode) {

    var query, queryStart, fragStart, pairKeyStart, i, len, name, value, result;

    if (!url || typeof url !== 'string') {
        url = location.href; // more robust than location.search, which is flaky
    }
    if (!paramKey || typeof paramKey !== 'string') {
        paramKey = '&';
    }
    if (!pairKey || typeof pairKey !== 'string') {
        pairKey = '=';
    }
    // when you do not explicitly tell the API...
    if (arguments.length < 5) {
        // it will unescape parameter keys and values by default...
        decode = true;
    }

    queryStart = url.indexOf('?');
    if (queryStart >= 0) {
        // grab everything after the very first ? question mark...
        query = url.substring(queryStart + 1);
    } else {
        // assume the input is already parameter data...
        query = url;
    }
    // remove fragment identifiers...
    fragStart = query.indexOf('#');
    if (fragStart >= 0) {
        // remove everything after the first # hash mark...
        query = query.substring(0, fragStart);
    }
    // make sure at this point we have enough material to do something useful...
    if (query.indexOf(paramKey) >= 0 || query.indexOf(pairKey) >= 0) {
        // we no longer need the whole query, so get the parameters...
        query = query.split(paramKey);
        result = {};
        // loop through the parameters...
        for (i = 0, len = query.length; i < len; i = i + 1) {
            pairKeyStart = query[i].indexOf(pairKey);
            if (pairKeyStart >= 0) {
                name = query[i].substring(0, pairKeyStart);
            } else {
                name = query[i];
            }
            // only continue for non-empty names that we have not seen before...
            if (name && !Object.prototype.hasOwnProperty.call(result, name)) {
                if (decode) {
                    // unescape characters with special meaning like ? and #
                    name = decodeURIComponent(name);
                }
                if (pairKeyStart >= 0) {
                    value = query[i].substring(pairKeyStart + 1);
                    if (value) {
                        if (decode) {
                            value = decodeURIComponent(value);
                        }
                    } else {
                        value = missingValue;
                    }
                } else {
                    value = missingValue;
                }
                result[name] = value;
            }
        }
        return result;
    }
}

版本2:返回一个具有两个相同长度数组的数据映射对象,一个用于名称,另一个用于值,每个参数都有一个索引。此格式支持重复名称,并故意不消除重复名称,因为这可能就是您希望使用此格式的原因。

function getQueryData(url, paramKey, pairKey, missingValue, decode) {

    var query, queryStart, fragStart, pairKeyStart, i, len, name, value, result;

    if (!url || typeof url !== 'string') {
          url = location.href; // more robust than location.search, which is flaky
    }
        if (!paramKey || typeof paramKey !== 'string') {
            paramKey = '&';
        }
        if (!pairKey || typeof pairKey !== 'string') {
            pairKey = '=';
        }
        // when you do not explicitly tell the API...
        if (arguments.length < 5) {
            // it will unescape parameter keys and values by default...
            decode = true;
        }

        queryStart = url.indexOf('?');
        if (queryStart >= 0) {
            // grab everything after the very first ? question mark...
            query = url.substring(queryStart + 1);
        } else {
            // assume the input is already parameter data...
            query = url;
        }
        // remove fragment identifiers...
        fragStart = query.indexOf('#');
        if (fragStart >= 0) {
            // remove everything after the first # hash mark...
            query = query.substring(0, fragStart);
        }
        // make sure at this point we have enough material to do something useful...
        if (query.indexOf(paramKey) >= 0 || query.indexOf(pairKey) >= 0) {
            // we no longer need the whole query, so get the parameters...
            query = query.split(paramKey);
            result = {
                names: [],
                values: []
            };
            // loop through the parameters...
            for (i = 0, len = query.length; i < len; i = i + 1) {
                pairKeyStart = query[i].indexOf(pairKey);
                if (pairKeyStart >= 0) {
                    name = query[i].substring(0, pairKeyStart);
                } else {
                    name = query[i];
                }
                // only continue for non-empty names...
                if (name) {
                    if (decode) {
                        // unescape characters with special meaning like ? and #
                        name = decodeURIComponent(name);
                    }
                    if (pairKeyStart >= 0) {
                        value = query[i].substring(pairKeyStart + 1);
                        if (value) {
                            if (decode) {
                                value = decodeURIComponent(value);
                            }
                        } else {
                            value = missingValue;
                        }
                    } else {
                        value = missingValue;
                    }
                    result.names.push(name);
                    result.values.push(value);
                }
           }
           return result;
       }
   }

Roshambo jQuery方法没有处理解码URL

http://snipplr.com/view/26662/get-url-parameters-with-jquery--improved/

在return语句中添加时也添加了该功能

return decodeURIComponent(results[1].replace(/\+/g, " ")) || 0;

现在您可以找到更新的要点:

$.urlParam = function(name){
var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(window.location.href);
if (!results) { return 0; }
return decodeURIComponent(results[1].replace(/\+/g, " ")) || 0;
}
function getUrlVar(key){
    var result = new RegExp(key + "=([^&]*)", "i").exec(window.location.search); 
    return result && unescape(result[1]) || ""; 
}

https://gist.github.com/1771618

这是我自己的看法。第一个函数将URL字符串解码为名称/值对的对象:

url_args_decode = function (url) {
  var args_enc, el, i, nameval, ret;
  ret = {};
  // use the DOM to parse the URL via an 'a' element
  el = document.createElement("a");
  el.href = url;
  // strip off initial ? on search and split
  args_enc = el.search.substring(1).split('&');
  for (i = 0; i < args_enc.length; i++) {
    // convert + into space, split on =, and then decode 
    args_enc[i].replace(/\+/g, ' ');
    nameval = args_enc[i].split('=', 2);
    ret[decodeURIComponent(nameval[0])]=decodeURIComponent(nameval[1]);
  }
  return ret;
};

另外,如果您更改了一些参数,可以使用第二个函数将参数数组放回URL字符串中:

url_args_replace = function (url, args) {
  var args_enc, el, name;
  // use the DOM to parse the URL via an 'a' element
  el = document.createElement("a");
  el.href = url;
  args_enc = [];
  // encode args to go into url
  for (name in args) {
    if (args.hasOwnProperty(name)) {
      name = encodeURIComponent(name);
      args[name] = encodeURIComponent(args[name]);
      args_enc.push(name + '=' + args[name]);
    }
  }
  if (args_enc.length > 0) {
    el.search = '?' + args_enc.join('&');
  } else {
    el.search = '';
  }
  return el.href;
};