微信小程序集成ECharts完整教程：从组件配置到图表渲染

图表初始化与配置项定义

import * as echarts from "../../../../../components/echarts/echarts.min"
function initChart(canvas, width, height, dpr) {
  const chart = echarts.init(canvas, null, {
    width: width,
    height: height,
    devicePixelRatio: dpr
  });
  canvas.setChart(chart);
 
  var option = {
    backgroundColor: 'rgba(255,255,255,0.8)',
    tooltip: {
      trigger: 'item'
    },
    legend: {//显示图例
      show: true,
      top: '5%',
      left: 'center'
    },
    series: [{
      label: {
        normal: {
          fontSize: 14
        }
      },
      
      type: 'pie',
      center: ['50%', '60%'],//位置
      radius: ['20%', '30%'],//圈大小
      
      data: [{//每一项
        value: 3,
        name: '数字农业 3个'
      }, {
        value: 2,
        name: '体育产业 2个'
      }, {
        value: 7,
        name: '乡村新业态 7个'
      }, {
        value: 3,
        name: '其他产业 3个'
      }
    ]
    }]
  };
  chart.setOption(option);
 
  return chart;
}

data: {
    ec: {
      onInit: initChart
    },
  },

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

<view class="ec-container">
     <ec-canvas canvas-id="echart-pie" ec="{{ec}}"></ec-canvas>
</view>

.ec-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100vw;
    height: 30vh;
  }
  
  ec-canvas {
    width: 100%;
    height: 100%;
  }