Echarts折线堆叠图鼠标移动到区域时显示自定义提示

tooltip : {
    trigger: 'axis',
    axisPointer: {
        type: "cross",
        label: {
            formatter: function (params) {
                if (params.seriesData.length === 0) {
                    window.mouseCurValue = params.value;
                }
            }
        }
    },
    formatter: function (params) {
        let res = "", sum = 0;
        for (let i = 0; i < params.length; i++) {
            let series = params[i];
            sum += Number(series.data);
            if (sum >= window.mouseCurValue) {
                res = series.axisValue + "<br/>" + series.marker + series.seriesName + ":" + series.data + "<br/>";
                break;
            }
        }
        return res;
    },
}