{
          title: "持续时长",
          key: "alarmDuration",
          align: "center",
          minwidth: 100,
          render: (h, params) => {
            var theTime = params.row.alarmDuration; // 秒
            var middle = 0; // 分
            var hour = 0; // 小时
            if (theTime > 60) {
              middle = parseInt(theTime / 60);
              theTime = parseInt(theTime % 60);
              if (middle > 60) {
                hour = parseInt(middle / 60);
                middle = parseInt(middle % 60);
              }
            }
            var result = "" + parseInt(theTime) + "秒";
            if (middle > 0) {
              result = "" + parseInt(middle) + "分" + result;
            }
            if (hour > 0) {
              result = "" + parseInt(hour) + "小时" + result;
            }
            return h("span", result);
          }
        },

　　parseInt() 函数可解析一个字符串，并返回一个整数