您应该直接在setup方法中注册按钮，而不是在init事件中注册按钮。这可以确保在呈现工具栏之前注册按钮。

<template>
  <Editor
    api-key="any-key"
    v-model="content"
    :init="editorSettings"
    @onInit="handleEditorInit"
  />
</template>

<script>
import Editor from '@tinymce/tinymce-vue';

export default {
  components: {
    Editor,
  },
  data() {
    return {
      content: '',
      editorSettings: {
        setup: function (editor) {
          console.log('setup', editor);

          // Register the custom button directly within the setup method
          editor.ui.registry.addButton('test', {
            text: 'Custom',
            tooltip: 'Add Custom Action',
            onAction: function () {
              console.log('test button clicked');
            },
          });

          editor.on('init', function () {
            console.log('setup init', editor);
          });
        },
        toolbar: 'test',
      },
    };
  },
  methods: {
    handleEditorInit() {
      console.log('Editor initialized');
    }
  }
};
</script>

字符串
通过将addButton调用移到init事件之外并直接移到setup方法中，自定义按钮现在应该会如预期的那样出现在工具栏中。