docs: function (datas, options) {
          var i, li, self = this;
          if (!options)
              this.comboDatas = datas;
          else{
              this.comboDatas = []
              for(var i = 0; i< datas.length; i++){
                  this.comboDatas.push({name:datas[i][options.name],value:datas[i][options.value]});
              }
          }
          if (!this._ul) {
              this._ul = u.makeDOM('<ul class="u-combo-ul"></ul>');
              // this.element.parentNode.appendChild(this._ul);
              document.body.appendChild(this._ul);
          }
          this._ul.innerHTML = '';
          //TODO 增加filter
          for (i = 0; i < this.comboDatas.length; i++) {
              li = u.makeDOM('<li class="u-combo-li">' + this.comboDatas[i].name + '</li>');//document.createElement('li');
              li._index = i;
              u.on(li, 'click', function () {
                  self.selectItem(this._index);
              })
              var rippleContainer = document.createElement('span');
              u.addClass(rippleContainer, 'u-ripple');
              li.appendChild(rippleContainer);
              new URipple(li)
              this._ul.appendChild(li);
          }
      }