code: function switchBorderColor(editor, flag) {
          var tableArr = domUtils.getElementsByTagName(editor.body, "table"), color;
          for (var i = 0, node; node = tableArr[i++];) {
              var td = domUtils.getElementsByTagName(node, "td");
              if (td[0]) {
                  if (flag) {
                      color = (td[0].style.borderColor).replace(/\s/g, "");
                      if (/(#ffffff)|(rgb\(255,255,255\))/ig.test(color))
                          domUtils.addClass(node, "noBorderTable")
                  } else {
                      domUtils.removeClasses(node, "noBorderTable")
                  }
              }
  
          }
      }
docs: 当表格边框颜色为白色时设置为虚线,true为添加虚线
  @param editor
  @param flag