vue3组合式函数如何接收响应式状态

徐同保2024-05-15 13:01

Index.vue:

javascript 复制代码

<script setup>
import { ref, onMounted } from 'vue'
import useList from './useList'
import './index.css'

const indexCount = ref(0)

const { count, handleClick } = useList(indexCount)

const handleIndexCount = () => {
  indexCount.value++
}



onMounted(() => {})
</script>

<template>
  <div class="m-home-wrap">
    <button @click="handleIndexCount">{{ indexCount }}</button>

    <button @click="handleClick">{{ count }}</button>
    <div class="m-home-demo"></div>
  </div>
</template>

<style></style>

useList.js:

javascript 复制代码

import { ref, onMounted, watchEffect, toValue } from 'vue'

const useList = (props) => {
  const count = ref(0)


  watchEffect(() => {
    let value = toValue(props)
    console.log(value)
    count.value = value
  })

  const handleClick = () => {
    count.value++
  }

  onMounted(() => {
    console.log(1)
  })

  return {
    count,
    handleClick,
  }
}

export default useList

watchEffect的作用：

响应式地追踪其依赖

toValue的作用：

toValue() 是一个在 3.3 版本中新增的 API。它的设计目的是将 ref 或 getter 规范化为值。如果参数是 ref，它会返回 ref 的值；如果参数是函数，它会调用函数并返回其返回值

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