text: var CreateDiv = (function () {
      var instance;
      var CreateDiv = function (html){
          if(instance) {
              return instance;
          }
          this.html = html;
          this.init();
          return instance = this;
      };
      CreateDiv.prototype.init = function() {
          console.log('a');
      };
      return CreateDiv;
  })();
  var a = new CreateDiv('aa');
  var b = new CreateDiv('bb');
  console.log(a === b);