loadJSON(file, [userAgent])
Reads the contents of a JSON file and returns an object with the data. If the file is specified by name as string, the path can point either directly at a file in the document’s data directory or be specified as an absolute path.
Type: function
Parameter(s):
- file {String | File}:The JSON file name in the document’s data directory, an absolute path to a JSON file, a File instance or an URL. 
- userAgent {String} Optional:Optional parameter when URL is used, to specify a user-agent making request. 
Returns:
- 
    {Object}:
 The resulting data object.