1.下载 echarts

npm i -s echarts
2.在main.js中引入

import { createApp } from 'vue'
import App from './App.vue'
 
// 引入 echarts
import * as echarts from 'echarts'
const app = createApp(App)
// 全局挂载 echarts
app.config.globalProperties.$echarts = echarts
 
app.mount('#app')
3.方式一：vue3.0的写法，在组件中使用

<template>
  <div
    ref="myChart"
    id="myChart"
    :style="{ width: '800px', height: '400px' }"
  ></div>
</template>
 
<script>
import { getCurrentInstance, onMounted } from 'vue';
 
export default {
  setup() {
    // 通过 internalInstance.appContext.config.globalProperties 获取全局属性或方法
    let internalInstance = getCurrentInstance();
    let echarts = internalInstance.appContext.config.globalProperties.$echarts;
 
    onMounted(() => {
      const dom = document.getElementById('myChart');
      const myChart = echarts.init(dom); // 初始化echarts实例
      const option = {
        xAxis: {
          type: 'category',
          data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
        },
        yAxis: {
          type: 'value'
        },
        series: [
          {
            data: [820, 932, 901, 934, 1290, 1330, 1320],
            type: 'line',
            smooth: true
          }
        ]
      };
      // 设置实例参数
      myChart.setOption(option);
    });
    return {};
  }
};
</script>
4：方式二：全局挂载后，在组件中以 vue2 的写法

<template>
  <div
    ref="myChart"
    id="myChart"
    :style="{ width: '800px', height: '400px' }"
  ></div>
</template>
<script>
export default {
  mounted() {
    this.drawLine();
  },
  methods: {
    drawLine() {
      const dom = this.$refs['myChart'];
      const myChart = this.$echarts.init(dom); // 初始化echarts实例
      const option = {
        xAxis: {
          type: 'category',
          data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
        },
        yAxis: {
          type: 'value'
        },
        series: [
          {
            data: [820, 932, 901, 934, 1290, 1330, 1320],
            type: 'line',
            smooth: true
          }
        ]
      };
      // 设置实例参数
      myChart.setOption(option);
    }
  }
};
</script>
5.方式三：直接在组件中引入echarts

<template>
  <div
    ref="myChart"
    id="myChart"
    :style="{ width: '800px', height: '400px' }"
  ></div>
</template>
 
<script>
// 方式二：直接在组件中引入echarts
import * as echarts from 'echarts';
export default {
  mounted() {
    const dom = this.$refs['myChart']; // 获取dom节点
    const myChart = echarts.init(dom); // 初始化echarts实例
 
    const option = {
      xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
      },
      yAxis: {
        type: 'value'
      },
      series: [
        {
          data: [820, 932, 901, 934, 1290, 1330, 1320],
          type: 'line',
          smooth: true
        }
      ]
    };
    // 设置实例参数
    myChart.setOption(option);
  }
};
</script>
————————————————

    今天查别的问题的时候发现getCurrentInstance这个api已经不推荐使用了，特意在官网搜了一下确实没有这个api了，可以使用provide和inject来解决；参考链接：vue3中getCurrentInstance不推荐使用以及在＜script setup＞中获取全局内容(三种方式)_vue3 getcurrentinstance不推荐-CSDN博客

mian.js中全局变量的绑定

// app.config.globalProperties.$echarts = echarts;
app.provide("$echarts",echarts)

组件中的获取

import { ref, onMounted,inject } from 'vue';

// 通过 internalInstance.appContext.config.globalProperties 获取全局属性或方法
// let internalInstance = getCurrentInstance();
// let echarts = internalInstance.appContext.config.globalProperties.$echarts;
let echarts = inject("$echarts")

                        
原文链接：https://blog.csdn.net/weixin_43919509/article/details/120570975