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                ## toRef 作用: 創建一個ref對象,其value值指向另一個對象中的某個屬性值 語法: const name = toRef(person, ‘name’) 應用:要將響應式對象中的某個屬性單獨提供給外部使用 擴展: **toRefs**: 與toRef功能一致,但是可以批量創建多個ref對象,語法: toRefs(person) ``` <template> <h2>姓名: {{name2}}</h2> <h2>年齡: {{person.age}}</h2> <button @click="person.name += '~' ">修改姓名</button> <button @click="person.age++">增長年齡</button> </template> <script> //使用setup的注意事項 import { reactive, toRef, toRefs } from 'vue' export default { name: 'test9', setup(){ let person = reactive({ name: '張三', age: 18, job:{ salary: '15k' }, }) //toRef const name2 = toRef(person,'name') //第一個參數是對象,第二個參數是鍵名 console.log('toRef轉變的是',name2); //ref定義的對象 //toRefs,批量處理對象的所有屬性 //const x = toRefs(person) //console.log('toRefs轉變的是',x); //是一個對象 return { person, name2, ...toRefs(person) } }, } </script> ``` toRefs后打印結果:![](https://img.kancloud.cn/c5/2d/c52d68c636378e590bb0f54e176408a4_1099x273.png)
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