code: function() {
  
          var activeElement = this.__activeElement;
          var isBlur = arguments[0];
  
  
          if (isBlur !== false) {
              this.__focus(activeElement);
          }
  
          this._autofocus = false;
          this.__popup.removeClass(this.className + '-focus');
          this.__dispatchEvent('blur');
  
          return this;
      }
docs: 让浮层失去焦点。将焦点退还给之前的元素，照顾视力障碍用户