获取 codemirror editor 的实例对象，从而对编辑器内容进行一系列的操作，比如选中、插入、折叠等等。:::

通过组件 ref 获取

先获取组件，再获取组件中的实例对象，需要注意生命周期。

<template>
  <Codemirror
    ref="cmComponentRef" // [!code focus]
    v-model:value="code"
    :options="cmOptions"
    border
    :height="200"
  >
  </Codemirror>
</template>

<script lang="ts">
import { ref } from "vue";
import Codemirror, { CmComponentRef } from "codemirror-editor-vue3"; 
import type { Editor, EditorConfiguration } from "codemirror";

// language
import "codemirror/mode/javascript/javascript.js";

export default defineComponent({
  components: {
    Codemirror,
  },
  setup() {
    const code = ref(`const ary = []`);
    const cmComponentRef = ref<CmComponentRef>(null);
    const cminstance = ref<Editor>();

    const cmOptions: EditorConfiguration = {
      mode: "javascript",
    };

    onMounted(() => {
      cminstance.value = cmComponentRef.value?.cminstance;
      cminstance.value?.focus();
    });

    // or
    nextTick(() => {
      cminstance.value = cmComponentRef.value?.cminstance;
      cminstance.value?.focus();
    });

    return {
      cmComponentRef,
      code,
      cmOptions,
    };
  },
});
</script>

通过钩子函数获取

可以在change和ready中拿到实例对象

<template>
  <Codemirror
    v-model:value="code"
    :options="cmOptions"
    border
    :height="200"
    @ready="onReady" // [!code focus]
    @change="onChange" // [!code focus]
  >
  </Codemirror>
</template>

<script lang="ts">
import { ref } from "vue";
import Codemirror from "codemirror-editor-vue3";
import type { Editor, EditorConfiguration } from "codemirror";

// language
import "codemirror/mode/javascript/javascript.js";

export default defineComponent({
  components: {
    Codemirror,
  },
  setup() {
    const code = ref(`const ary = []`);
    const cminstance = ref<Editor>(); 

    const cmOptions: EditorConfiguration = {
      mode: "javascript",
    };

    const onReady = (cm: Editor) => {
      cminstance.value = cm;
      cminstance.value?.focus();
    };

    const onChange = (value: string, cm: Editor) => {
      cminstance.value = cm;
      cminstance.value?.focus();
    };

    return {
      code,
      cmOptions,
      onReady,
      onChange,
    };
  },
});
</script>