text: ///import core
  ///commands 当输入内容超过编辑器高度时，编辑器自动增高
  ///commandsName  AutoHeight,autoHeightEnabled
  ///commandsTitle  自动增高
  /**
   * @description 自动伸展
   * @author zhanyi
   */
  UE.plugins['autoheight'] = function () {
      var me = this;
      //提供开关，就算加载也可以关闭
      me.autoHeightEnabled = me.options.autoHeightEnabled !== false;
      if (!me.autoHeightEnabled) {
          return;
      }
  
      var bakOverflow,
          span, tmpNode,
          lastHeight = 0,
          options = me.options,
          currentHeight,
          timer;
  
      function adjustHeight() {
          var me = this;
          clearTimeout(timer);
          timer = setTimeout(function () {
  
              if (me.queryCommandState && me.queryCommandState('source') != 1) {
                  if (!span) {
                      span = me.document.createElement('span');
                      //trace:1764
                      span.style.cssText = 'display:block;width:0;margin:0;padding:0;border:0;clear:both;';
                      span.innerHTML = '.';
                  }
                  tmpNode = span.cloneNode(true);
                  me.body.appendChild(tmpNode);
  
                  currentHeight = Math.max(domUtils.getXY(tmpNode).y + tmpNode.offsetHeight,Math.max(options.minFrameHeight, options.initialFrameHeight));
  
                  if (currentHeight != lastHeight) {
  
                      me.setHeight(currentHeight);
  
                      lastHeight = currentHeight;
                  }
  
                  domUtils.remove(tmpNode);
  
              }
          }, 50);
      }
  
      me.addListener('destroy', function () {
          me.removeListener('contentchange', adjustHeight);
          me.removeListener('keyup', adjustHeight);
          me.removeListener('mouseup', adjustHeight);
      });
      me.enableAutoHeight = function () {
          if (!me.autoHeightEnabled) {
              return;
          }
          var doc = me.document;
          me.autoHeightEnabled = true;
          bakOverflow = doc.body.style.overflowY;
          doc.body.style.overflowY = 'hidden';
          me.addListener('contentchange', adjustHeight);
          me.addListener('keyup', adjustHeight);
          me.addListener('mouseup', adjustHeight);
          //ff不给事件算得不对
          setTimeout(function () {
              adjustHeight.call(this);
          }, browser.gecko ? 100 : 0);
          me.fireEvent('autoheightchanged', me.autoHeightEnabled);
      };
      me.disableAutoHeight = function () {
  
          me.body.style.overflowY = bakOverflow || '';
  
          me.removeListener('contentchange', adjustHeight);
          me.removeListener('keyup', adjustHeight);
          me.removeListener('mouseup', adjustHeight);
          me.autoHeightEnabled = false;
          me.fireEvent('autoheightchanged', me.autoHeightEnabled);
      };
      me.addListener('ready', function () {
          me.enableAutoHeight();
          //trace:1764
          var timer;
          domUtils.on(browser.ie ? me.body : me.document, browser.webkit ? 'dragover' : 'drop', function () {
              clearTimeout(timer);
              timer = setTimeout(function () {
                  adjustHeight.call(this);
              }, 100);
  
          });
      });
  
  
  };
  
  