code: function() {
          this.$main.removeClass([defaultClass, this.options.customClass, disableClass].join(' '));
          this.$main.off('mouseover.bizTextarea')
              .off('mouseout.bizTextarea')
              .off('focus.bizTextarea')
              .off('blur.bizTextarea');
          this.$main.data(dataKey, null);
      }
docs: 销毁