项目开发过程中，我们会遇到一些情况，就是多个组件都可以重复使用的一部分代码逻辑，功能函数，我们想要复用，这可怎么办呢？
先来一段我们的一把梭代码，代码没有复用，全都放到当前组件
<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>执行代码看一下：
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
}
}
改写一下我们的模板代码里的script：
<script>
import { useNumber } from "./common-hooks/numberChange";
export default {
setup() {
const { myNumber, a, b, setNumber } = useNumber();
return { myNumber, a, b, setNumber };
},
};
</script>
