title: The confuse about use jquery $.ajax to read javascript file
body: <p>suppose I have a config javascript file:</p>
  
  <pre><code>window.Config = {};
  
  Config.UI = {
      "Area": {},
      "Layer": {},
      "Sprites": {},
      "Audio": {}
  };
  
  Config.UI.Area = {
      "prop": {
          "uuid": {
              "_type": "string",
          },
          "frame": {
              "_type": "rect",
              "_value": {
                  "x": "0",
              },
              "_aka": "frame"
          },
          "zIndex": {
              "_type": "string",
          }
      },
  </code></pre>
  
  <p>then I want use $.ajax to read this file:</p>
  
  <pre><code>        $.ajax({
              url:'js/config.js',
              success:function (data, textStatus) {
                  console.log(data);
              }
          })
  </code></pre>
  
  <p>the question is how can I get some key's value in the config,by use the data $.ajax return?</p>
  
  <p>like the "Config.UI" or the 'uuid' in ui.area.prop?Or can I convert them to json?</p>