在JavaScript中解析查询字符串[重复]

本文翻译自：Parse query string in JavaScript [duplicate]

Possible Duplicate: 可能重复：
How can I get query string values? 如何获取查询字符串值？

I need to parse the query string www.mysite.com/default.aspx?dest=aboutus.aspx . 我需要解析查询字符串www.mysite.com/default.aspx?dest=aboutus.aspx 。 How do I get the dest variable in JavaScript? 如何在JavaScript中获取dest变量？

---

#1楼

参考：https://stackoom.com/question/8lqZ/在JavaScript中解析查询字符串-重复

---

#2楼

function parseQuery(queryString) {
    var query = {};
    var pairs = (queryString[0] === '?' ? queryString.substr(1) : queryString).split('&');
    for (var i = 0; i < pairs.length; i++) {
        var pair = pairs[i].split('=');
        query[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1] || '');
    }
    return query;
}

Turns query string like hello=1&another=2 into object {hello: 1, another: 2} . 将查询字符串（如hello=1&another=2转换为对象{hello: 1, another: 2} 。 From there, it's easy to extract the variable you need. 从那里，很容易提取您需要的变量。

That said, it does not deal with array cases such as "hello=1&hello=2&hello=3" . 也就是说，它不处理诸如"hello=1&hello=2&hello=3"数组情况。 To work with this, you must check whether a property of the object you make exists before adding to it, and turn the value of it into an array, pushing any additional bits. 要使用它，您必须在添加之前检查您所创建的对象的属性是否存在，并将其值转换为数组，并推送任何其他位。

---

#3楼

I wanted to pick up specific links within a DOM element on a page, send those users to a redirect page on a timer and then pass them onto the original clicked URL. 我想拿起一个页面上的DOM元素中的 特定环节，把那些用户重定向页面上的计时器，然后将它们传递给原始广告点击的网址。 This is how I did it using regular javascript incorporating one of the methods above. 这就是我使用常规javascript结合上述方法之一的方法。

Page with links: Head 带链接的页面： Head

  function replaceLinks() {   
var content = document.getElementById('mainContent');
            var nodes = content.getElementsByTagName('a');
        for (var i = 0; i < document.getElementsByTagName('a').length; i++) {
            {
                href = nodes[i].href;
                if (href.indexOf("thisurl.com") != -1) {

                    nodes[i].href="http://www.thisurl.com/redirect.aspx" + "?url=" + nodes[i];
                    nodes[i].target="_blank";

                }
            }
    }
}

Body 身体

Redirect page Head 重定向页面 头部

   function getQueryVariable(variable) {
        var query = window.location.search.substring(1);
        var vars = query.split('&');
        for (var i = 0; i < vars.length; i++) {
            var pair = vars[i].split('=');
            if (decodeURIComponent(pair[0]) == variable) {
                return decodeURIComponent(pair[1]);
            }
        }
        console.log('Query variable %s not found', variable);
    }
    function delayer(){
        window.location = getQueryVariable('url')
    }

Body 身体

---

#4楼

Following on from my comment to the answer @bobby posted, here is the code I would use: 继我对@bobby发布的答案的评论之后，这里是我将使用的代码：

    function parseQuery(str)
        {
        if(typeof str != "string" || str.length == 0) return {};
        var s = str.split("&");
        var s_length = s.length;
        var bit, query = {}, first, second;
        for(var i = 0; i < s_length; i++)
            {
            bit = s[i].split("=");
            first = decodeURIComponent(bit[0]);
            if(first.length == 0) continue;
            second = decodeURIComponent(bit[1]);
            if(typeof query[first] == "undefined") query[first] = second;
            else if(query[first] instanceof Array) query[first].push(second);
            else query[first] = [query[first], second]; 
            }
        return query;
        }

This code takes in the querystring provided (as 'str') and returns an object. 此代码接受提供的查询字符串（作为'str'）并返回一个对象。 The string is split on all occurances of &, resulting in an array. 字符串在＆的所有出现时被拆分，从而产生一个数组。 the array is then travsersed and each item in it is split by "=". 然后对该数组进行travsers，并将其中的每个项目拆分为“=”。 This results in sub arrays wherein the 0th element is the parameter and the 1st element is the value (or undefined if no = sign). 这导致子数组，其中第0个元素是参数，第1个元素是值（如果没有=符号，则为undefined）。 These are mapped to object properties, so for example the string "hello=1&another=2&something" is turned into: 这些映射到对象属性，因此例如字符串“hello = 1＆another = 2＆something”变为：

{
hello: "1",
another: "2",
something: undefined
}

In addition, this code notices repeating reoccurances such as "hello=1&hello=2" and converts the result into an array, eg: 此外，此代码注意到重复重复，例如“hello = 1＆hello = 2”并将结果转换为数组，例如：

{
hello: ["1", "2"]
}

You'll also notice it deals with cases in whih the = sign is not used. 你还会注意到它处理了没有使用=符号的情况。 It also ignores if there is an equal sign straight after an & symbol. 如果在＆符号后面有一个等号，它也会忽略它。

A bit overkill for the original question, but a reusable solution if you ever need to work with querystrings in javascript :) 对于原始问题有点矫枉过正，但如果您需要在javascript中使用查询字符串，则可以使用可重用的解决方案:)

---

#5楼

I wanted a simple function that took a URL as an input and returned a map of the query params. 我想要一个简单的函数，它将URL作为输入并返回查询参数的映射。 If I were to improve this function, I would support the standard for array data in the URL, and or nested variables. 如果我要改进这个功能，我会支持URL和/或嵌套变量中的数组数据标准。

This should work back and for with the jQuery.param( qparams ) function. 这应该可以使用jQuery.param（qparams）函数。

function getQueryParams(url){
    var qparams = {},
        parts = (url||'').split('?'),
        qparts, qpart,
        i=0;

    if(parts.length <= 1 ){
        return qparams;
    }else{
        qparts = parts[1].split('&');
        for(i in qparts){

            qpart = qparts[i].split('=');
            qparams[decodeURIComponent(qpart[0])] = 
                           decodeURIComponent(qpart[1] || '');
        }
    }

    return qparams;
};

---

#6楼

Me too! 我也是！ http://jsfiddle.net/drzaus/8EE8k/ http://jsfiddle.net/drzaus/8EE8k/

(Note: without fancy nested or duplicate checking) （注意：没有花哨的嵌套或重复检查）

deparam = function (querystring) {
  // remove any preceding url and split
  querystring = querystring.substring(querystring.indexOf('?')+1).split('&');
  var params = {}, pair, d = decodeURIComponent;
  // march and parse
  for (var i = querystring.length - 1; i >= 0; i--) {
    pair = querystring[i].split('=');
    params[d(pair[0])] = d(pair[1] || '');
  }

  return params;
};//--  fn  deparam

And tests: 并测试：

var tests = {};
tests["simple params"] = "ID=2&first=1&second=b";
tests["full url"] = "http://blah.com/?" + tests["simple params"];
tests['just ?'] = '?' + tests['simple params'];

var $output = document.getElementById('output');
function output(msg) {
  $output.innerHTML += "\n" + Array.prototype.slice.call(arguments, 0).join("\n");
}
$.each(tests, function(msg, test) {
  var q = deparam(test);
  // prompt, querystring, result, reverse
  output(msg, test, JSON.stringify(q), $.param(q));
  output('-------------------');
});

Results in: 结果是：

simple params
ID=2&first=1&second=b
{"second":"b","first":"1","ID":"2"}
second=b&first=1&ID=2
-------------------
full url
http://blah.com/?ID=2&first=1&second=b
{"second":"b","first":"1","ID":"2"}
second=b&first=1&ID=2
-------------------
just ?
?ID=2&first=1&second=b
{"second":"b","first":"1","ID":"2"}
second=b&first=1&ID=2
-------------------