text: /**
   * Created by elinaguo on 15/3/18.
   */
  'use strict';
  
  exports.isNullOrEmpty = function (value) {
    return (value === undefined || value === null || value === '');
  };
  exports.isTrue = function(value){
  
    if (this.isNullOrEmpty(value))
          return false;
  
    return (value.toString().toLowerCase() === 'true');
  };
  