微信小程序集成ECharts：定制引入、动态刷新与层级遮挡解决方案

{
  "component": true,
  "usingComponents": {
    "ec-canvas": "../../../ec-canvas/ec-canvas"
  }
}

<view class="echarts1" >
     <view wx:if="{{canvasIsShow}}" class="container" style="width: 100%; height: 100%;">
           <ec-canvas id="mychart-dom-bar" canvas-id="mychart-bar" ec="{{ ec }}" force-use-old-canvas="true"></ec-canvas>
     </view>
   </view>

import * as echarts from '../../../ec-canvas/echarts'

function initChart(canvas, width, height, dpr) {
  const chart = echarts.init(canvas, null, {
    width: width,
    height: height,
    devicePixelRatio: dpr // 像素
  });
  canvas.setChart(chart);

  var option = {
    barWidth: 20,
    grid:{
      x:40,    //图例左边距
      y:30,    //图例上边距
      x2:25,   //图例右边距
      y2:20,   //图例下边距
  },
    xAxis: {
      type: 'category',
      data: ['1','2','3','5','6','7','8'],  //x轴数据
      axisLabel: {
        interval: 0,
        textStyle: {
          show:true,
          fontSize: '9',
        },
    },
    },
    yAxis: {
      type: 'value',
      axisLabel: {
        textStyle: {
          show:true,
          fontSize: '10',
        },
    },
    },
    series: [
      //柱形图
      {
        data: [10,20,30,40,50,60,70],
        type: 'bar',
        color: 'rgb(0, 153, 255)',
      },
      //线型图
      {
        data: [15,25,35,45,55,65,75],
        type: 'line',
        color: 'rgb(255, 136, 0)',
        itemStyle: {
          normal: {
            label: {
              show: true, //开启显示
              position: 'top', //在上方显示
              textStyle: { //数值样式
                color: 'black',
                fontSize: '9'
              }
            }
          }
        },
      }
    ]
  };
  chart.setOption(option);
  return chart;
}

Page({
  data: {
    ec: {
      onInit: initChart
    },
    canvasIsShow: true, //图表是否渲染
  },
})

<picker bindchange="bindCasPickerChange" value="{{casIndex1}}" range="{{casArray}}">
      <cover-view class="epidemic-header">
        <cover-view class="cover-input">
        {{casArray[casIndex]}}
        </cover-view>
      </cover-view>
    </picker>