Methods to load data asynchronously using ECharts in WeChat applets

<view class="container">
 <ec-canvas  canvas- ec="{{ ecBar }}"></ec-canvas>
 <ec-canvas  canvas- ec="{{ ecScatter }}"></ec-canvas>
</view>

import * as echarts from '../../ec-canvas/echarts';
Page({
 data: {
  ecBar: {
   lazyLoad: true // Delay loading  },
  ecScatter: {
   lazyLoad: true 
  }
 },
 onLoad(){
   = ('#mychart-dom-multi-bar');
   = ('#mychart-dom-multi-scatter');
  this.init_bar();
  this.init_sca();
 },
 init_bar: function (){
  ((canvas, width, height) => {
   // Initialize the chart   const barChart = (canvas, null, {
    width: width,
    height: height
   });
   (());
   // Note that you must return the chart instance here, otherwise it will affect event processing, etc.   return barChart;
  });
 },
 init_sca: function () {
  ((canvas, width, height) => {
   // Initialize the chart   const scaChart = (canvas, null, {
    width: width,
    height: height
   });
   (());
   // Note that you must return the chart instance here, otherwise it will affect event processing, etc.   return scaChart;
  });
 },
 getBarOption:function(){
  //return request data  return {
   color: ['#37a2da', '#32c5e9', '#67e0e3'],
   tooltip: {
    trigger: 'axis',
    axisPointer: {      // Axis indicator, axis trigger is valid     type: 'shadow'    // Default is a straight line, optional: 'line' | 'shadow'    }
   },
   legend: {
    data: ['heat', 'front', 'Negative']
   },
   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: ['Auto House', 'Today', 'Baidu Tieba', 'A little information', 'WeChat', 'Weibo', 'Zhihu'],
     axisLine: {
      lineStyle: {
       color: '#999'
      }
     },
     axisLabel: {
      color: '#666'
     }
    }
   ],
   series: [
    {
     name: 'heat',
     type: 'bar',
     label: {
      normal: {
       show: true,
       position: 'inside'
      }
     },
     data: [300, 270, 340, 344, 300, 320, 310]
    },
    {
     name: 'front',
     type: 'bar',
     stack: 'Total quantity',
     label: {
      normal: {
       show: true
      }
     },
     data: [120, 102, 141, 174, 190, 250, 220]
    },
    {
     name: 'Negative',
     type: 'bar',
     stack: 'Total quantity',
     label: {
      normal: {
       show: true,
       position: 'left'
      }
     },
     data: [-20, -32, -21, -34, -90, -130, -110]
    }
   ]
  };
 },
 getScaOption:function(){
  //Request data  var data = [];
  var data2 = [];
  for (var i = 0; i < 10; i++) {
   (
    [
     (() * 100),
     (() * 100),
     (() * 40)
    ]
   );
   (
    [
     (() * 100),
     (() * 100),
     (() * 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'
  };
 },
});