code: function(_dest, _src){
                  var _nodeName, _attr;
  
                  if (_dest.nodeType !== 1) {
                      return;
                  }
                  // lt ie9 才有
                  if (_dest.clearAttributes) {
                      _dest.clearAttributes();
                      _dest.mergeAttributes(_src);
                  }
                  // 判断是否有需要处理属性的节点
                  _nodeName = _dest.nodeName.toLowerCase();
                  if(_prop = _definitions.fixProps[_nodeName]){
                      _dest[_prop] = _src[_prop];
                  }
                  //移除节点标示
                  _dest.removeAttribute($._$signal);
                  // 移除ID:  TODO? 是否允许有重复ID?
                  _dest.removeAttribute("id");
              }
docs: dest src attribute fixed