Flot.js插件配合flot.tooltip.js绘图节点提示

Question

Flot.js插件配合flot.tooltip.js绘图节点制作提示字样，弹窗情况下，提示在覆盖层下面没上来~知道是要加window.top把提示拉上来，但是不知道往哪里写~~

---

getFlotData: function () {
    var obj = {
        'waterTempAlarmId': currenPKId
    };

    var flotSet = {
    grid: {
        hoverable: true,
        borderWidth: 1,
        borderColor: '#ccc'
    },
    tooltip: {
        show: true,
        cssClass: "flot-tt",
        content: "时间：%x<br/>水温：%y ℃",
        defaultTheme: false
    },
    xaxis: {
        // tickLength: 0,
        // show: true
        mode: "time",
        timeformat: "%h:%M:%S"
    },
    yaxis: {
        autoscaleMargin: 0.06,
        position: "left"
    },
    colors: ['#62a8ea']
};

app.getData.getTempData(obj, function (data) {
    var tempDataArr = [];
    data.forEach(function (item) {
        var d = new Date(item.alarmTime);
        var day = d.getHours();
        d = d.setHours(day+8);
        var arr = [d, item.waterTemp];
        tempDataArr.push(arr);
    });
    console.log(tempDataArr);

    var flot_data = {
        lines: {
            show: true,
            tension: 0.4,
            lineWidth: 2,
            fill: 0,
            lineColor: "#62a8ea"
        },
        points: {
            show: true,
            lineWidth: 1.5,
            radius: 3,
            symbol: "circle",
            fill: true,
            fillColor: "#62a8ea"
        },
        shadowSize: 0,
        data: tempDataArr
    };

    // console.log(tempDataArr);   // 当前水温数据

    $.plot(trendModel.find('[id="waterTempFlot"]'), [flot_data], flotSet);
});