code: function showSelecterHover(clientX, clientY){
          divDomSelector.style.display = 'none';
          var newSelectDom = document.elementFromPoint(clientX, clientY);
          if(newSelectDom && isNotInToolsPannel(newSelectDom) && /^(HTML|IFRAME)$/i.test(newSelectDom.tagName) === false){
              divDomSelector.style.display = 'block';
              if(newSelectDom !== lastSelectDom){
                  var rect = newSelectDom.getBoundingClientRect();
                  divDomSelector.style.left = rect.left+'px';
                  divDomSelector.style.top = rect.top+'px';
                  divDomSelector.style.width = rect.width+'px';
                  divDomSelector.style.height = rect.height+'px';
                  var frameId = getFrameId();
                  GlobalEvents.emit('selecterHover', {
                      frame: frameId,
                      path: getDomPath(newSelectDom)
                  });
                  lastSelectDom = newSelectDom;
              }
          }
      }
docs: 显示当前hover的dom