public/data/calendar-simple.js

function getVirtulData(year) {
    year = year || '2017';
    var date = +echarts.number.parseDate(year + '-01-01');
    var end = +echarts.number.parseDate(year + '-12-31');
    var dayTime = 3600 * 24 * 1000;
    var data = [];
    for (var time = date; time <= end; time += dayTime) {
        data.push([
            echarts.format.formatTime('yyyy-MM-dd', time),
            Math.floor(Math.random() * 10000)
        ]);
    }
    return data;
}

option = {
    visualMap: {
        show: false,
        min: 0,
        max: 10000
    },
    calendar: {
        range: '2017'
    },
    series: {
        type: 'heatmap',
        coordinateSystem: 'calendar',
        data: getVirtulData(2017)
    }
};