微信小程序中使用ECharts 异步加载数据的方法

<view class="container">
 <ec-canvas id="mychart-dom-multi-bar" canvas-id="mychart-multi-bar" ec="{{ ecbar }}"></ec-canvas>
 <ec-canvas id="mychart-dom-multi-scatter" canvas-id="mychart-multi-scatter" ec="{{ ecscatter }}"></ec-canvas>
</view>

import * as echarts from '../../ec-canvas/echarts';
page({
 data: {
  ecbar: {
   lazyload: true // 延迟加载
  },
  ecscatter: {
   lazyload: true 
  }
 },
 onload(){
  this.barcomponent = this.selectcomponent('#mychart-dom-multi-bar');
  this.scacomponnet = this.selectcomponent('#mychart-dom-multi-scatter');
  this.init_bar();
  this.init_sca();
 },
 init_bar: function (){
  this.barcomponent.init((canvas, width, height) => {
   // 初始化图表
   const barchart = echarts.init(canvas, null, {
    width: width,
    height: height
   });
   barchart.setoption(this.getbaroption());
   // 注意这里一定要返回 chart 实例，否则会影响事件处理等
   return barchart;
  });
 },
 init_sca: function () {
  this.scacomponnet.init((canvas, width, height) => {
   // 初始化图表
   const scachart = echarts.init(canvas, null, {
    width: width,
    height: height
   });
   scachart.setoption(this.getscaoption());
   // 注意这里一定要返回 chart 实例，否则会影响事件处理等
   return scachart;
  });
 },
 getbaroption:function(){
  //return 请求数据
  return {
   color: ['#37a2da', '#32c5e9', '#67e0e3'],
   tooltip: {
    trigger: 'axis',
    axispointer: {      // 坐标轴指示器，坐标轴触发有效
     type: 'shadow'    // 默认为直线，可选为：'line' | 'shadow'
    }
   },
   legend: {
    data: ['热度', '正面', '负面']
   },
   grid: {
    left: 20,
    right: 20,
    bottom: 15,
    top: 40,
    containlabel: true
   },
   xaxis: [
    {
     type: 'value',
     axisline: {
      linestyle: {
       color: '#999'
      }
     },
     axislabel: {
      color: '#666'
     }
    }
   ],
   yaxis: [
    {
     type: 'category',
     axistick: { show: false },
     data: ['汽车之家', '今日头条', '百度贴吧', '一点资讯', '微信', '微博', '知乎'],
     axisline: {
      linestyle: {
       color: '#999'
      }
     },
     axislabel: {
      color: '#666'
     }
    }
   ],
   series: [
    {
     name: '热度',
     type: 'bar',
     label: {
      normal: {
       show: true,
       position: 'inside'
      }
     },
     data: [300, 270, 340, 344, 300, 320, 310]
    },
    {
     name: '正面',
     type: 'bar',
     stack: '总量',
     label: {
      normal: {
       show: true
      }
     },
     data: [120, 102, 141, 174, 190, 250, 220]
    },
    {
     name: '负面',
     type: 'bar',
     stack: '总量',
     label: {
      normal: {
       show: true,
       position: 'left'
      }
     },
     data: [-20, -32, -21, -34, -90, -130, -110]
    }
   ]
  };
 },
 getscaoption:function(){
  //请求数据 
  var data = [];
  var data2 = [];
  for (var i = 0; i < 10; i++) {
   data.push(
    [
     math.round(math.random() * 100),
     math.round(math.random() * 100),
     math.round(math.random() * 40)
    ]
   );
   data2.push(
    [
     math.round(math.random() * 100),
     math.round(math.random() * 100),
     math.round(math.random() * 100)
    ]
   );
  }
  var axiscommon = {
   axislabel: {
    textstyle: {
     color: '#c8c8c8'
    }
   },
   axistick: {
    linestyle: {
     color: '#fff'
    }
   },
   axisline: {
    linestyle: {
     color: '#c8c8c8'
    }
   },
   splitline: {
    linestyle: {
     color: '#c8c8c8',
     type: 'solid'
    }
   }
  };
  return {
   color: ["#ff7070", "#60b6e3"],
   backgroundcolor: '#eee',
   xaxis: axiscommon,
   yaxis: axiscommon,
   legend: {
    data: ['aaaa', 'bbbb']
   },
   visualmap: {
    show: false,
    max: 100,
    inrange: {
     symbolsize: [20, 70]
    }
   },
   series: [{
    type: 'scatter',
    name: 'aaaa',
    data: data
   },
   {
    name: 'bbbb',
    type: 'scatter',
    data: data2
   }
   ],
   animationdelay: function (idx) {
    return idx * 50;
   },
   animationeasing: 'elasticout'
  };
 },
});