code: function columnsVisibleFun() {
      var oThis = this,
          w = 0;
      this.firstColumn = true;
      this.overWidthVisibleColumnArr = new Array();
      $.each(this.gridCompColumnArr, function () {
          if (this.options.visible) {
              w += parseInt(this.options.width);
              if (this.options.width > this.options.realWidth) {
                  oThis.overWidthVisibleColumnArr.push(this);
              }
              this.firstColumn = oThis.firstColumn;
              oThis.firstColumn = false;
              oThis.lastVisibleColumn = this;
              oThis.lastVisibleColumnWidth = this.options.width;
          }
      });
      this.contentRealWidth = w;
  }
docs: /*
  column是否显示处理，只在初始化gridCompColumn对象时调用，其他时候不再调用
  计算固定区域及内容区域的真实宽度
  计算第一列
  计算内容区域最后一列显示列