text: /**
   * @fileOverview
   * @author amoschen
   * @version 1
   * Created: 13-3-14 上午9:56
   */
  LBF.define('util.zIndexGenerator', function(){
      var zIndex;
  
      /**
       * Generate legal z-index(a css attribute) value. Later generated is bigger than previous ones.
       * @class zIndexGenerator
       * @namespace util
       * @module util
       * @constructor
       * @return {Number} Legal z-index
       */
      return function () {
          if (!zIndex) {
              zIndex = 0;
          }
          var _zIndex = Math.round(new Date().getTime() % 1e8 / 1000);
          zIndex = Math.max(_zIndex, zIndex + 1);
          return zIndex;
      };
  });