我有一个getter从cookie中获取值。

现在我有了两个cookie,名字分别是shares=和obligation =。

我想让这个getter只从义务cookie中获取值。

我怎么做呢?因此for语句将数据拆分为单独的值,并将其放入数组中。

 function getCookie1() {
    // What do I have to add here to look only in the "obligations=" cookie? 
    // Because now it searches all the cookies.

    var elements = document.cookie.split('=');
    var obligations= elements[1].split('%');
    for (var i = 0; i < obligations.length - 1; i++) {
        var tmp = obligations[i].split('$');
        addProduct1(tmp[0], tmp[1], tmp[2], tmp[3]);
    }
 }

当前回答

在我看来,你可以把cookie键值对分成一个数组,并基于你的搜索:

var obligations = getCookieData("obligations");

运行如下:

function getCookieData( name ) {
    var pairs = document.cookie.split("; "),
        count = pairs.length, parts; 
    while ( count-- ) {
        parts = pairs[count].split("=");
        if ( parts[0] === name )
            return parts[1];
    }
    return false;
}

小提琴:http://jsfiddle.net/qFmPc/

或者甚至可能是以下内容:

function getCookieData( name ) {
    var patrn = new RegExp( "^" + name + "=(.*?);" ),
        patr2 = new RegExp( " " + name + "=(.*?);" );
    if ( match = (document.cookie.match(patrn) || document.cookie.match(patr2)) )
        return match[1];
    return false;
}

其他回答

一行转换cookie为JavaScript对象或地图

Object.fromEntries(document.cookie.split('; ').map(v=>v.split(/=(.*)/s).map(decodeURIComponent)))
new Map(document.cookie.split('; ').map(v=>v.split(/=(.*)/s).map(decodeURIComponent)))

在我的项目中,我使用以下函数按名称访问cookie

function getCookie(cookie) {
    return document.cookie.split(';').reduce(function(prev, c) {
        var arr = c.split('=');
        return (arr[0].trim() === cookie) ? arr[1] : prev;
    }, undefined);
}

通过名称获取cookie只需将cookie的名称传递给下面的函数

function getCookie(cname) {
  var name = cname + "=";
  var decodedCookie = decodeURIComponent(document.cookie);
  var ca = decodedCookie.split(';');
  for(var i = 0; i <ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) == ' ') {
      c = c.substring(1);
    }
    if (c.indexOf(name) == 0) {
      return c.substring(name.length, c.length);
    }
  }
  return "";
}
const cookies = 'key1=chocolate; key2=iceCream; key3=cookies;';

// convert string into array with split
const arrCookies = cookies.split('; '); // [ 'key1=chocolate', 'key2=iceCream', 'key3=cookies' ]

// split key value by equal sign
const arrArrCookiesKeyValue = arrCookies.map(cookie => [cookie.split('=')]);  // [[['key1', 'chocolate']], ...']

// make an object with key value
const objectKeyValueCookies = {}; // { key1: 'chocolate', key2: 'iceCream', key3: 'cookies;' }
for (let arr of arrArrCookiesKeyValue) {
    objectKeyValueCookies[arr[0][0]] = arr[0][1];
}

// find the key in object
const findValueByKey = (key = null, objectCookies) => objectCookies[key];
console.log(findValueByKey('key2', objectKeyValueCookies)); // chocolate

我更喜欢在cookie上使用一个正则表达式匹配:

window.getCookie = function(name) {
  var match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
  if (match) return match[2];
}

也可以作为函数使用,检查下面的代码。

function check_cookie_name(name) 
    {
      var match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
      if (match) {
        console.log(match[2]);
      }
      else{
           console.log('--something went wrong---');
      }
   }

感谢Scott Jungwirth的评论。