技术版本：
vue 3.2.40、codemirror 6.0.1、less 4.1.3、vue-codemirror 6.1.1、
@codemirror/lang-vue 0.1.2、@codemirror/theme-one-dark 6.1.2

效果图：

1.安装插件

yarn add codemirror vue-codemirror @codemirror/lang-vue @codemirror/theme-one-dark

2.新建子组件CodeMirror（src/view-components/CodeMirror/index.vue）

<script setup lang="ts">
  import type { CSSProperties } from 'vue';
  import { ref } from 'vue';
  import { Codemirror } from 'vue-codemirror';
  import { vue } from '@codemirror/lang-vue';
  import { oneDark } from '@codemirror/theme-one-dark';

  interface Props {
    codeStyle?: CSSProperties; // 代码样式
    dark?: boolean; // 是否暗黑主题
    code?: string; // 代码字符串
    // placeholder?: string // 占位文本
    // autofocus?: boolean // 自动聚焦
    // disabled?: boolean // 禁用输入行为和更改状态
    // indentWithTab?: boolean // 启用tab按键
    // tabSize?: number // tab按键缩进空格数
  }
  const props = withDefaults(defineProps<Props>(), {
    // placeholder: 'Code goes here...',
    codeStyle: () => {
      return {};
    },
    dark: false,
    code: '',
    // autofocus: false,
    // disabled: false,
    // indentWithTab: true,
    // tabSize: 2
  });
  const extensions = props.dark ? [vue(), oneDark] : [vue()];
  const codeValue = ref(props.code);
  const emits = defineEmits([
    'update:code',
    'ready',
    'change',
    'focus',
    'blur',
  ]);
  function handleReady(payload: any) {
    // console.log('ready')
    emits('ready', payload);
  }
  function onChange(value: string, viewUpdate: any) {
    emits('change', value, viewUpdate);
    emits('update:code', value);
  }
  function onFocus(viewUpdate: any) {
    emits('focus', viewUpdate);
  }
  function onBlur(viewUpdate: any) {
    emits('blur', viewUpdate);
  }
</script>

<template>
  <div>
    <Codemirror
      v-model="codeValue"
      :style="codeStyle"
      :extensions="extensions"
      v-bind="$attrs"
      @ready="handleReady"
      @change="onChange"
      @focus="onFocus"
      @blur="onBlur"
    />
  </div>
</template>

<style lang="less" scoped>
  /deep/ .cm-editor {
    border-radius: 8px;
    outline: none;
    border: 1px solid transparent;
    .cm-scroller {
      border-radius: 8px;
    }
  }
  /deep/ .cm-focused {
    border: 1px solid fade(#000, 48%);
  }
</style>

3.父组件调用CodeMirror组件

<template>
    <div class="addHttpMqttServicePage">
        <CodeMirror
              v-model:code="form.script"
              dark
              :codeStyle="{ width: '1000px', height: '190px', fontSize: '16px' }"
              :disabled="false"
              @ready="onReady"
              @change="onChange"
              @focus="onFocus"
              @blur="onBlur"
            />
    </div>
  </template>
  
  <script setup lang="ts">
    import { ref, defineProps } from 'vue';
    import CodeMirror from '@/view-components/CodeMirror/index.vue';
    
    const form = ref({
      script: '',
    });
  
    const onReady = (payload: any) => {
      console.log('ready:', payload);
    };
    const onChange = (value: string, viewUpdate: any) => {
      console.log('change:', value);
      console.log('change:', viewUpdate);
    };
    const onFocus = (viewUpdate: any) => {
      console.log('focus:', viewUpdate);
    };
    const onBlur = (viewUpdate: any) => {
      console.log('blur:', viewUpdate);
    };
  </script>
  
  <style scoped lang="less">
    .addHttpMqttServicePage {
      width: 100%;
      height: 100%;
      padding: 20px;
      &-header {
        font-size: 18px;
        font-weight: bold;
      }
      &-body {
        padding-top: 24px;
        width: 50%;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;

      }
    }

  </style>
  

4.注意点

1.官方文档：https://codemirror.net/
2.disabled为true时，则只允许可读不能修改