code: public Option yAxis(Axis... values) {
          if (values == null || values.length == 0) {
              return this;
          }
          if (this.yAxis().size() == 2) {
              throw new RuntimeException("yAxis已经存在2个，无法继续添加!");
          }
          if (this.yAxis().size() + values.length > 2) {
              throw new RuntimeException("添加的yAxis超出了最大允许的范围:2!");
          }
          this.yAxis().addAll(Arrays.asList(values));
          return this;
      }
docs: 添加y轴
  
  @param values
  @return