Vue3.0 全面探索 基于 Visual Studio Code 的代码片段开发插件

• Vue3 Snippets源码
• Vue3 Snippets下载

This extension adds Vue3 Code Snippets into Visual Studio Code.

这个插件基于最新的 Vue3 的 API 添加了 Code Snippets。

Including most of the API of Vue3. You can type reactive, choose reactive, and press ENTER, then const data = reactive({...}) appear on the screen.

插件的 Snippets 如下表格所示，比如你可以键入 reactive 然后按上下键选中 reactive 再按 Enter 键，就输入了const data = reactive({...})了。

Vue Composition API

@vue/composition-api 使开发者们可以在 Vue 2.x 中使用 Vue 3.0 引入的基于函数的逻辑复用机制。

English Version

• Installation / 安装
• Usage / 使用
• TypeScript
  • TSX
• Limitations / 限制
• API
• Changelog / 更改日志

npm

npm install @vue/composition-api --save

yarn

yarn add @vue/composition-api

CDN

<script src="https://unpkg.com/@vue/composition-api/dist/vue-composition-api.umd.js"></script>

By using the global variable window.vueCompositionApi.

通过全局变量 window.vueCompositionApi 来使用。

You must install @vue/composition-api via Vue.use() before using other APIs:

在使用任何 @vue/composition-api 提供的能力前，必须先通过 Vue.use() 进行安装:

import Vue from 'vue';
import VueCompositionApi from '@vue/composition-api';

Vue.use(VueCompositionApi);

After installing the plugin you can use the Composition API to compose your component.

安装插件后，您就可以使用新的 Composition API 来开发组件了。

This plugin requires TypeScript version >3.5.1. If you are using vetur, make sure to set vetur.useWorkspaceDependencies to true.

To let TypeScript properly infer types inside Vue component options, you need to define components with createComponent:

请使用最新版的 TypeScript，如果你使用了 vetur，请将 vetur.useWorkspaceDependencies 设为 true。

为了让 TypeScript 正确的推导类型，我们必须使用 createComponent 来定义组件:

import { createComponent } from '@vue/composition-api';

const Component = createComponent({
  // 启用类型推断
});

const Component = {
  // 无法进行选项的类型推断
  // TypeScript 无法知道这是一个 Vue 组件的选项对象
};

TSX

An Example Repository with TS and TSX support is provided to help you start.

To support TSX, create a declaration file with following content in your project.

这里有一个配置好 TS/TSX 支持的示例仓库来帮助你快速开始.

要支持 TSX，请创建一个类型定义文件并提供正确的 JSX 定义。内容如下：

// file: shim-tsx.d.ts`
import Vue, { VNode } from 'vue';
import { ComponentRenderProxy } from '@vue/composition-api';

declare global {
  namespace JSX {
    // tslint:disable no-empty-interface
    interface Element extends VNode {}
    // tslint:disable no-empty-interface
    interface ElementClass extends ComponentRenderProxy {}
    interface ElementAttributesProperty {
      $props: any; // specify the property name to use
    }
    interface IntrinsicElements {
      [elem: string]: any;
    }
  }
}

Ref Unwrap

Unwrap is not working with Array index.

数组索引属性无法进行自动的Unwrap:

Should not store ref as a direct child of Array:

不要使用 Array 直接存取 ref 对象:

const state = reactive({
  list: [ref(0)],
});
// no unwrap, `.value` is required
state.list[0].value === 0; // true

state.list.push(ref(1));
//  no unwrap, `.value` is required
state.list[1].value === 1; // true

Should not use ref in a plain object when working with Array:

不要在数组中使用含有 ref 的普通对象:

const a = {
  count: ref(0),
};
const b = reactive({
  list: [a], // a.count will not unwrap!!
});

// no unwrap for `count`, `.value` is required
b.list[0].count.value === 0; // true

const b = reactive({
  list: [
    {
      count: ref(0), // no unwrap!!
    },
  ],
});

// no unwrap for `count`, `.value` is required
b.list[0].count.value === 0; // true

Should always use ref in a reactive when working with Array:

应该总是将 ref 存放到 reactive 对象中:

const a = reactive({
  count: ref(0),
});
const b = reactive({
  list: [a],
});
// unwrapped
b.list[0].count === 0; // true

b.list.push(
  reactive({
    count: ref(1),
  })
);
// unwrapped
b.list[1].count === 1; // true

Using reactive will mutate the origin object

reactive 会返回一个修改过的原始的对象

This is an limitation of using Vue.observable in Vue 2.

此行为与 Vue 2 中的 Vue.observable 一致

Vue 3 will return an new proxy object.

Vue 3 中会返回一个新的的代理对象.

watch() API

onTrack and onTrigger are not available in WatchOptions.

不支持 onTrack 和 onTrigger 选项。

Template Refs

✅ Support ❌ Not Supported

✅ String ref && return it from setup():

<template>
  <div ref="root"></div>
</template>

<script>
  export default {
    setup() {
      const root = ref(null);

      onMounted(() => {
        // the DOM element will be assigned to the ref after initial render
        console.log(root.value); // <div/>
      });

      return {
        root,
      };
    },
  };
</script>

✅ String ref && return it from setup() && Render Function / JSX:

export default {
  setup() {
    const root = ref(null);

    onMounted(() => {
      // the DOM element will be assigned to the ref after initial render
      console.log(root.value); // <div/>
    });

    return {
      root,
    };
  },
  render() {
    // with JSX
    return () => <div ref="root" />;
  },
};

❌ Function ref:

<template>
  <div :ref="el => root = el"></div>
</template>

<script>
  export default {
    setup() {
      const root = ref(null);

      return {
        root,
      };
    },
  };
</script>

❌ Render Function / JSX in setup():

export default {
  setup() {
    const root = ref(null);

    return () =>
      h('div', {
        ref: root,
      });

    // with JSX
    return () => <div ref={root} />;
  },
};

If you really want to use template refs in this case, you can access vm.$refs via SetupContext.refs.

如果你依然选择在 setup() 中写 render 函数，那么你可以使用 SetupContext.refs 来访问模板引用，它等价于 Vue 2.x 中的 this.$refs:

⚠️ Warning: The SetupContext.refs won't exist in Vue 3.0. @vue/composition-api provide it as a workaround here.

⚠️ 警告: SetupContext.refs 并不属于 Vue 3.0 的一部分, @vue/composition-api 将其曝光在 SetupContext 中只是临时提供一种变通方案。

export default {
  setup(initProps, setupContext) {
    const refs = setupContext.refs;
    onMounted(() => {
      // the DOM element will be assigned to the ref after initial render
      console.log(refs.root); // <div/>
    });

    return () =>
      h('div', {
        ref: 'root',
      });

    // with JSX
    return () => <div ref="root" />;
  },
};

You may also need to augment the SetupContext when working with TypeScript:

如果项目使用了 TypeScript，你还需要扩展 SetupContext 类型:

import Vue from 'vue';
import VueCompositionApi from '@vue/composition-api';

Vue.use(VueCompositionApi);

declare module '@vue/composition-api/dist/component/component' {
  interface SetupContext {
    readonly refs: { [key: string]: Vue | Element | Vue[] | Element[] };
  }
}

Even if there is no definitive Vue 3 API for SSR yet, this plugin implements the onServerPrefetch lifecycle hook that allows you to use the serverPrefetch hook found in the classic API.

import { onServerPrefetch } from '@vue/composition-api';

export default {
  setup (props, { ssrContext }) {
    const result = ref();

    onServerPrefetch(async () => {
      result.value = await callApi(ssrContext.someId);
    });

    return {
      result,
    };
  },
};

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