How can I associate two values in Javascript or Jquery? -

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It seems that this should be easy to do but I can not find any practical solutions to the original idea code associated with the URL With an array and depending on whether the URL is parsed as a referral, a code is inserted in the local storage. 

  var site = {รข ???? Example1.com : "X10", an example? Example 2.com: "X11", an example? Example 3.com: "X12"} if (document.referrer.indexOf (site value)! = -1) {if (localStorage) {localStorage.setItem ("code", sitekey); }}   
 So if the reference is example1.com, the code set locally will be "x10" and so on. I have probably read about using Underscore.JS_Invert method, but I think I should have a more clear solution. Lesson "> 
 It is slightly incompatible, because it finds matches after processing, but this is a very simple code:  
  Object.keys (site). ForEach (function ( Key) {if (document.referrer.indexOf (gtk)> gt; -1} {if (localStorage) {localStorage.setItem ("code", site [key]}}}}})   
 
  Update : Attention to the underscore tag. With underscores, I can make slight changes, instead of doing it:   _. (Two pairs (site), function (pair) {if (document.referrer.indexOf (pair [0])> gt; -1) {if ( Localstorage), {localStorage.setItem ("code", pair [1]);}}};   
 The only important advantage is that they can work in the old environment which is  Object.keys , or  Array.prototype.forEach .

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