Vue3使用hooks函数实现代码复用详解

<template>
  <img alt="Vue logo" src="./assets/logo.png" />
  <div>
    VUE3中的HOOKS
  </div>
  <button @click="setNumber">点击此按钮，调用setNumber函数，数字会+1：{{myNumber}}</button>
  <button @click="a++">点击此按钮，数字会+1：{{a}}</button>
  <button @click="b--">点击此按钮，数字会-1：{{b}}</button>
</template>
<script>
import { reactive,ref,computed,watch,watchEffect } from "vue";
export default {
  setup(){
    const  myNumber = ref(0)
    const  a = ref(0)
    const  b = ref(0)
    const setNumber = ()=>{
      myNumber.value = myNumber.value+1;
    }
    watch([a,b],([newA,newB],[oldA,oldB])=>{
      console.log('newA,oldA:')
      console.log(newA,oldA)
      console.log('newA,oldB:')
      console.log(newA,oldB)
    })
    return{
      myNumber,
      a,
      b,
      setNumber
    }
  }
}
</script>
<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
  
}
button{
    display: block;
    margin: 0 auto;
  }
</style>

import { ref,watch } from "vue";
export const useNumber =() =>{
    const  myNumber = ref(0)
    const  a = ref(0)
    const  b = ref(0)
    const setNumber = ()=>{
      myNumber.value = myNumber.value+1;
    }
    watch([a,b],([newA,newB],[oldA,oldB])=>{
      console.log('newA,oldA:')
      console.log(newA,oldA)
      console.log('newA,oldB:')
      console.log(newA,oldB)
    })
    return{
      myNumber,
      a,
      b,
      setNumber
    }
}

<script>
import { useNumber } from "./common-hooks/numberChange";
export default {
  setup() {
    const { myNumber, a, b, setNumber } = useNumber();
    return { myNumber, a, b, setNumber };
  },
};
</script>