echart在微信小程序的使用

echarts不显示在微信小程序

<!-- 微信小程序的echart的使用 -->
<view class="container">
  <ec-canvas id="mychart-dom-bar" canvas-id="mychart-bar" ec="{{ ec }}"></ec-canvas>
</view>

css样式

ec-canvas {
    width: 100%;
    height: 100%;
  }
  .container {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;  
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    box-sizing: border-box;
  } 

echarts的grid属性详解

grid配置项：图标离容器的距离
show:是否显示直角坐标系网格-----------值:true?false
left:图表离容器左侧的距离-----------------值:number?百分比
top:图表离容器顶部的距离-----------------值:number?百分比
right:图表离容器右侧的距离---------------值:number?百分比
bottom:图表离容器底部的距离------------值:number?百分比
backgroundColor:网格背景色-------------值:rgba或#000000
borderColor:网格的边框颜色--------------值:rgba或#000000
borderWidth:网格的边框线宽-------------值:number
备注:背景色-边框-线宽生效前提:设置了show:true，边距不受show影响

js

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

let chart = null;

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

  var option = {
    tooltip: {
        trigger: 'axis',
        axisPointer: {
          type: 'shadow'
        }
      },
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
        axisLabel:{
            fontSize:10
        },
      },
      yAxis: {
        type: 'value',
      },
      series: [
        {
          data: [-120, 200, 150, 80, -70, 110, 130],
          type: 'bar'
        }
      ]
  };

  chart.setOption(option);
  return chart;
}

Page({
  onShareAppMessage: function (res) {
    return {
      title: 'ECharts 可以在微信小程序中使用啦！',
      path: '/pages/index/index',
      success: function () { },
      fail: function () { }
    }
  },
  data: {
    ec: {
      onInit: initChart
    }
  },

  onReady() {
    setTimeout(function () {
      // 获取 chart 实例的方式
      // console.log(chart)
    }, 2000);
  }
});