Vue toRef抽取出来单个的ref， toRefs 解构，toRaw

Posted 2023-01-11 安果移不动

toRef

单独抽出某个遍历为Ref

 这样是不行的 必须为相应对象才行

<template>
  <div>
     man 
     like 
  </div>
  <hr>
  <div>
    <button @click="change">修改</button>
  </div>
</template>
<script setup lang="ts">
import toRef, reactive, toRefs, toRaw from 'vue'



const man = reactive(name: "zhangsan", age: 18, like: "Jk")
const like=toRef(man,'like')

const change = () => 
  like.value = "洛丽塔"


</script>

toRefs

可以通过toref演变出来toRefs

const toRefs = <T extends object>(object: T) => 
  const map: any = 
  for (const key in object) 
    map[key] = toRef(object, key)
  
  return map

修改全部代码

<template>
  <div>
     man 
     like --name-- age
  </div>
  <hr>
  <div>
    <button @click="change">修改</button>
  </div>
</template>
<script setup lang="ts">
import toRef, reactive, toRaw from 'vue'


const man = reactive(name: "zhangsan", age: 18, like: "Jk")

const toRefs = <T extends object>(object: T) => 
  const map: any = 
  for (const key in object) 
    map[key] = toRef(object, key)
  
  return map


const name, age, like = toRefs(man)

const change = () => 
  like.value = "洛丽塔"


</script>

 用到vue的toRefs 就行了

<template>
  <div>
     man 
     like --name-- age
  </div>
  <hr>
  <div>
    <button @click="change">修改</button>
  </div>
</template>
<script setup lang="ts">
import toRef, reactive, toRaw,toRefs from 'vue'


const man = reactive(name: "zhangsan", age: 18, like: "Jk")



const name, age, like = toRefs(man)

const change = () => 
  like.value = "洛丽塔"


</script>

toRaw 也很好理解 是将ref对象转换为普通对象

 

<template>
  <div>
     man 
  </div>
  <hr>
  <div>
    <button @click="change">修改</button>
  </div>
</template>
<script setup lang="ts">
import toRef, reactive, toRaw, toRefs from 'vue'


const man = reactive(name: "zhangsan", age: 18, like: "Jk")


const change = () => 
  console.log(man, toRaw(man))


</script>

这个其实是取出来的__v_raw

<template>
  <div>
     man 
  </div>
  <hr>
  <div>
    <button @click="change">修改</button>
  </div>
</template>
<script setup lang="ts">
import toRef, reactive, toRaw, toRefs from 'vue'


const man = reactive(name: "zhangsan", age: 18, like: "Jk")


const change = () => 
  console.log(man, toRaw(man), man['__v_raw'])


</script>