echarts自定義提示框數據

      tooltip: {
        trigger: "axis",
        axisPointer: {
        // 坐標軸指示器，坐標軸觸發有效
        type: "line" // 默認為直線，可選為：'line' | 'shadow'
      },
      formatter: function(params) {
        var texts = "";
        for (var i = 0; i < params.length; i++) {
          if (i == 0) {
            texts += params[i].name + "<br>";
          }
          texts +=
          params[i].seriesName + ": " + params[i].value + "<br>";
        }
        return texts;
      }
    }