vue3 RFC初尝试

由于vue3.x还没有正式发布，所以可以通过安装包vue-function-api提前尝试

npm install vue-function-api  --save

main.js

import Vue from 'vue'
import { plugin } from 'vue-function-api'

Vue.use(plugin)

test.vue

<template>
  <div>
    <span>{{msg}}</span><br>
    <span>计算属性值：{{computedValue}}</span><br>

    <el-button @click="appendName">点击</el-button>
  </div>
</template>
<script>
import { value, computed, watch, onMounted, onUpdated, onUnmounted } from 'vue-function-api'
export default {
  props: {
    name: {
      type: String
    }
  },
  setup (props, context) {
    /* eslint-disable no-alert, no-console */
    const msg = value(2)
    const msg2 = value(3)
    console.log(context)
    const appendName = () => {
      msg.value += 1
      msg2.value -= 2
    }

    const computedValue = computed(() => msg.value * 2)

    watch([msg2, () => msg.value * 3], ([a, b]) => {
      console.log(`a is: ${a}`)
      console.log(`b is: ${b}`)
    })

    onMounted(() => {
      console.log('mounted!')
    })
    onUpdated(() => {
      console.log('updated!')
    })
    onUnmounted(() => {
      console.log('unmounted!')
    })
    /* eslint-disable no-alert, no-console */
    return {
      msg,
      appendName,
      computedValue
    }
  }
}
</script>

参考链接：
https://github.com/vuejs/vue-function-api/blob/master/README.zh-CN.md
https://zhuanlan.zhihu.com/p/68477600