代码 ：https://www.makeapie.com/editor.html?c=xryzwi7fVl

let result = [];
for (let i = data.length - 1; i >= 0; i--) {
    result.push(data[i]);
}

data = result;
option = {
    tooltip: {
        trigger: 'axis',
        formatter: function(params) {
            var res = params[0].name + "</br>";
            var date0 = params[0].data;
            var date1 = params[1].data;
            date0 = date0.getFullYear() + "-" + (date0.getMonth() + 1) + "-" + date0.getDate();
            date1 = date1.getFullYear() + "-" + (date1.getMonth() + 1) + "-" + date1.getDate();

            res += params[0].seriesName + "~" + params[1].seriesName + ":</br>" + date0 + "~" + date1 + "</br>";

            console.log(params[0]);
            return res;
        }

        // formatter: '{b}: {c}<br/>{b1}: {c1}'
    },
    legend: {
        y: 'bottom',
        data: ['计划时间', '实际时间']  //修改的地方1
    },

    xAxis: {
        type: 'time'
    },
    yAxis: {
  data: ['任务一', '任务二', '任务三', '任务四', '任务五', '任务六', '任务七']

    },
    series: [{
            name: '计划开始时间',
            type: 'bar',
            stack: 'test1',
            itemStyle: {
                normal: {
                    color: 'rgba(0,0,0,0)'
                }
            },
            data: [
                new Date("2015/09/2"),
                new Date("2015/09/15"),
                new Date("2015/09/15"),
                new Date("2015/10/03"),
                new Date("2015/10/04"),
                new Date("2015/10/05"),
                new Date("2015/10/06")
            ]
        },
        {
            name: '计划时间',
            type: 'bar',
            stack: 'test1',
            //修改地方2
            itemStyle: {
                normal: {
                    color: '#F98563'
                }
            },
            data: [
                new Date("2015/09/12"),
                new Date("2015/09/20"),
                new Date("2015/09/25"),
                new Date("2015/10/05"),
                new Date("2015/10/07"),
                new Date("2015/10/09"),
                new Date("2015/10/12")
            ]
        },
        {
            name: '实际开始时间',
            type: 'bar',
            stack: 'test2',
            itemStyle: {
                normal: {
                    color: 'rgba(0,0,0,0)'
                }
            },
            data: [
                new Date("2015/8/12"),
                new Date("2015/09/15"),
                new Date("2015/09/15"),
                new Date("2015/10/03"),
                new Date("2015/10/04"),
                new Date("2015/10/05"),
                new Date("2015/10/06")
            ]
        },
        {
            name: '实际时间',
            type: 'bar',
            stack: 'test2',
            //修改地方3
            itemStyle: {
                normal: {
                    color: '#A2E068'
                }
            },
            data: [
                new Date("2015/11/1"),
                new Date("2015/09/20"),
                new Date("2015/09/27"),
                new Date("2015/10/11"),
                new Date("2015/10/16"),
                new Date("2015/10/18"),
                new Date("2015/10/17")
            ]
        }
    ]
};