写段vue代码使用codemirror插件实现在codemirror的mode为JavaScript时，点击按钮时执行codemirror代码拼写检查功能

可以使用codemirror提供的spell-checker插件来实现拼写检查功能。首先，在vue组件中引入codemirror和spell-checker插件：

<template>
  <div>
    <codemirror ref="editor" v-model="code" :options="editorOptions"></codemirror>
    <button @click="spellCheck">Spell Check</button>
  </div>
</template>

<script>
import 'codemirror/lib/codemirror.css'
import 'codemirror/mode/javascript/javascript'
import 'codemirror/addon/edit/closebrackets'
import 'codemirror/addon/edit/matchbrackets'
import 'codemirror/addon/hint/show-hint'
import 'codemirror/addon/hint/javascript-hint'
import 'codemirror/addon/selection/active-line'
import 'codemirror/addon/display/placeholder'
import 'codemirror/addon/fold/foldgutter'
import 'codemirror/addon/fold/foldcode'
import 'codemirror/addon/fold/brace-fold'
import 'codemirror/addon/fold/comment-fold'
import 'codemirror/addon/fold/indent-fold'
import 'codemirror/addon/fold/markdown-fold'
import 'codemirror/addon/fold/xml-fold'
import 'codemirror/addon/search/searchcursor'
import 'codemirror/addon/search/search'
import 'codemirror/addon/search/matchesonscrollbar'
import 'codemirror/addon/search/jump-to-line'
import 'codemirror/addon/scroll/simplescrollbars'
import 'codemirror/addon/scroll/annotatescrollbar'
import 'codemirror/addon/scroll/scrollpastend'
import 'codemirror/addon/lint/lint'
import 'codemirror/addon/lint/javascript-lint'
import 'codemirror-spell-checker/dist/css/spell-checker.css'
import 'codemirror-spell-checker/dist/codemirror-spell-checker.js'

export default {
  data() {
    return {
      code: '',
      editorOptions: {
        mode: 'javascript',
        theme: 'default',
        lineNumbers: true,
        line: true,
        foldGutter: true,
        gutters: ['CodeMirror-linenumbers', 'CodeMirror-foldgutter'],
        extraKeys: {
          'Ctrl-Space': 'autocomplete',
          'Ctrl-Q': function(cm) {
            cm.foldCode(cm.getCursor())
          },
          'Ctrl-/': 'toggleComment',
        },
        lint: true,
      },
    }
  },
  methods: {
    spellCheck() {
      this.$refs.editor.codemirror.spellCheck()
    },
  },
}
</script>

然后，在editorOptions中添加spellcheck属性为true，这样就可以在codemirror的mode为JavaScript时启用拼写检查功能了。在vue组件的methods中添加spellCheck方法，该方法调用codemirror提供的spellCheck方法来执行拼写检查。