dataset 无序柱状图

描述:当前是关于Echarts图表中的 柱状图 示例。
 
            option = {
  legend: {},
  tooltip: {},
  dataset: {
    dimensions: ['predict', '<8h', '8-16h', '2017'],
    source: [
      { predict: '4月11日', '<8h': 5 },
      { predict: '4月12日', '<8h': 6 }, 
      { predict: '4月13日', '8-16h': 12 },
      { predict: '4月14日', '8-16h': 10 },
      { predict: '4月15日', '8-16h':15 },
    ],
  },
  xAxis: { 
    type: 'category',
        axisTick: {
        show: false,
      },
   },
  yAxis: [
    {
        type: 'value',
      min:0,
      max:24,
      interval:6,
   splitLine: {
        show: false,
      },
    },
    {
      type: 'value',
      splitLine: {
        show: false,
      },
      axisTick: {
        show: false,
      },
      axisLine: {
        show: false,
      },
      axisLabel: {
        show: false,
      },
    },
  ],
  // Declare several bar series, each will be mapped
  // to a column of dataset.source by default.
  series: [

       {
            name: '<8h',
            yAxisIndex: 1,
            type:'bar',
            barWidth: '25%',
            seriesLayoutBy: 'row',
            itemStyle: {
                color: {
                        x: 0,
                        y: 0,
                        x2: 1,
                        y2: 1,
                        colorStops: [
                            {offset: 0, color: 'rgba(32, 230, 164, 1)'},
                         
                            {offset: 1, color: 'rgba(108, 218, 255, 0)'}
                        ]
                    }
            }
        },
            {
            name: '8-16h',
            yAxisIndex: 1,
            type:'bar',
            barWidth: '25%',
            seriesLayoutBy: 'row',
            itemStyle: {
        
                color: {
                        x: 0,
                        y: 0,
                        x2: 1,
                        y2: 1,
                        colorStops: [
                            {offset: 0, color: '#F78678'},
                            {offset: 0.5, color: '#C359D0'},
                            {offset: 1, color: '#963EF5'}
                        ]
                    }
            }
        },
    { type: 'bar', yAxisIndex: 1 },
    
  ],
};