本地安装Echarts

npm install echarts --save
 
有淘宝镜像的可以选择  (安装速度快)
cnpm install echarts --save

新建一个echarts.js文件

// 引入 echarts 核心模块，核心模块提供了 echarts 使用必须要的接口。
import * as echarts from "echarts/core";
 
/** 引入柱状图and折线图图表，图表后缀都为 Chart  */
import { BarChart, LineChart } from "echarts/charts";
 
// 引入提示框，标题，直角坐标系，数据集，内置数据转换器组件，组件后缀都为 Component
import {
  TitleComponent,
  TooltipComponent,
  GridComponent,
  DatasetComponent,
  TransformComponent,
} from "echarts/components";
 
// 标签自动布局，全局过渡动画等特性
import { LabelLayout, UniversalTransition } from "echarts/features";
 
// 引入 Canvas 渲染器，注意引入 CanvasRenderer 或者 SVGRenderer 是必须的一步
import { CanvasRenderer } from "echarts/renderers";
 
// 注册必须的组件
echarts.use([
  TitleComponent,
  TooltipComponent,
  GridComponent,
  DatasetComponent,
  TransformComponent,
  BarChart,
  LabelLayout,
  UniversalTransition,
  CanvasRenderer,
  LineChart,
]);
 
// 导出
export default echarts;

创建好的js文件全局引入到main.js内

import { createApp } from 'vue'
import App from './App.vue'
import router from "./router/index"

import echarts from './utils/echarts';

const app = createApp(App)

app.config.globalProperties.$echarts = echarts

app.use(router)
app.use(pinia)

app.mount('#app')

这里需要注意:（组件名大写首字母）
按需引入时：import { LineChart } from “echarts/charts” 

<script setup>逻辑内使用echart

因为setup中没有this,而且这时候还没有渲染.所以,在setup中,也可以使用provide/inject把echarts引入进来.  在根组件里引入echarts

// App.vue文件内插入生产者provide 

<script setup>
import * as echarts from "echarts";
import { provide } from "vue";
provide("echarts", echarts);
</script>

<template>
  <router-view></router-view>
</template>

<style>
body {
  margin: 0px;
}
</style>

在需要的页面中inject

<template>
  <div>
    <div id="main"></div>
    <div id="maychar"></div>
  </div>
</template>
 
<script lang="js">
import { defineComponent, onMounted, inject } from "vue"; // 主要
export default defineComponent({
  setup() {
    onMounted(() => {
      change();
      changetype();
    });
    let echarts = inject("echarts"); // 主要
    // 基本柱形图
    const change = () => {
      const chartBox = echarts.init(document.getElementById("main")); // 主要
      const option = {
        xAxis: {
          data: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
        },
        yAxis: {},
        series: [
          {
            type: "bar",
            data: [23, 24, 18, 25, 27, 28, 25],
          },
        ],
      };
      chartBox.setOption(option);
      // 根据页面大小自动响应图表大小
      window.addEventListener("resize", function () {
        chartBox.resize();
      });
    };
    // 折线图
    const changetype = () => {
      // 获取组件实例
      const machart = echarts.init(document.getElementById("maychar"));
      // 设置配置项
      const option = {
        xAxis: {
          data: ["A", "B", "C", "D", "E"],
        },
        yAxis: {},
        series: [
          {
            data: [10, 22, 28, 43, 49],
            type: "line",
            stack: "x",
          },
          {
            data: [5, 4, 3, 5, 10],
            type: "line",
            stack: "x",
          },
        ],
      };
      // 复制
      machart.setOption(option);
      // 根据页面大小自动响应图表大小
      window.addEventListener("resize", function () {
        machart.resize();
      });
    };
    return {
      changetype,
    };
  },
});
</script>
 
<style lang="scss" scoped>
#main {
  min-width: 31.25rem;
  min-height: 31.25rem;
  // max-height: 500px;
}

#maychar {
  max-height: 500px;
  // max-height: 400px;
  height: 500px;
}
</style>

达到统一管理引入的echarts效果