if (WWOpenData.initCanvas) {
   WWOpenData.initCanvas()
}
WWOpenData.prefetch({ items }, (err, datas) => {
   if (err) {
      console.log('WWOpenDataError--------->',err)
   }
   datax = datas.items.map($0 => $0.data)
   var option1 = {
      title : {
           text: '时长',
           x: 'center',
           align: 'right'
       },
       tooltip : {
           trigger: 'axis',
           axisPointer : {
               type : 'shadow'
           }
      },
       legend: {
           data: []
       },
       toolbox: {
           feature: {
               saveAsImage: {}
           }
       },
       grid: {
           left: '3%',
           right: '4%',
           bottom: '10%',
           containLabel: true
       },
       //滚动条
       dataZoom: [
           {
               type: 'slider',
               show: true,
               xAxisIndex: [0],
               start: 0,
               end: 20,
               bottom:"0%",
               fillerColor:"#ABC5EC",
               maxSpan:20 //滚动条限制
           },
       ],
       yAxis:  {
           type: 'value',
           name: '总学习时长(分钟)'
       },
       xAxis: {
           type: 'category',
           data: datax,
           silent:true,
           triggerEvent:true
       },
       series: [
           {
               name: '总学习时长',
               type: 'bar',
               color: ["#53A8E2"],
               stack: '总量',
               label: {
                   normal: {
                       show: false,//是否显示数值
                   }
               },
               data: datay,
               clickable: true
           }
       ]
   };