首先在pages文件夹下创建了line文件夹并创建了index.js/.json/.wxml/.wxxs
已在app.json文件写入"pages/line/index"
在line文件夹中的index.js文件

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

const app = getApp();

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

  var option = {
    title: {
      text: '测试下面legend的红色区域不应被裁剪',
      left: 'center'
    },
    color: ["#37A2DA", "#67E0E3", "#9FE6B8"],
    legend: {
      data: ['A', 'B', 'C'],
      top: 50,
      left: 'center',
      backgroundColor: 'red',
      z: 100
    },
    grid: {
      containLabel: true
    },
    tooltip: {
      show: true,
      trigger: 'axis'
    },
    xAxis: {
      type: 'category',
      boundaryGap: false,
      data: ['周一', '周二', '周三', '周四', '周五', '周六', '周日'],
      // show: false
    },
    yAxis: {
      x: 'center',
      type: 'value',
      splitLine: {
        lineStyle: {
          type: 'dashed'
        }
      }
      // show: false
    },
    series: [{
      name: 'A',
      type: 'line',
      smooth: true,
      data: [18, 36, 65, 30, 78, 40, 33]
    }, {
      name: 'B',
      type: 'line',
      smooth: true,
      data: [12, 50, 51, 35, 70, 30, 20]
    }, {
      name: 'C',
      type: 'line',
      smooth: true,
      data: [10, 30, 31, 50, 40, 20, 10]
    }]
  };

  chart.setOption(option);
  return chart;
}

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

  onReady() {
  }
});

在line文件夹中的index.json文件

{
  "usingComponents": {
    "ec-canvas": "../../ec-canvas/ec-canvas"
  }
}

在line文件夹中的index.wxml文件

<!--index.wxml-->
<view class="container">
  <ec-canvas id="mychart-dom-line" canvas-id="mychart-line" ec="{{ ec }}"></ec-canvas>
</view>

在line文件夹中的index.wxss文件

/**index.wxss**/
ec-canvas {
  width: 100%;
  height: 100%;
}

可是编译后界面显示空白 是我配置哪里有错误吗