简单数据ref
复杂数据reactive

使用方法：

1. 创建文件useCount.js，
2. 引用vue模块的ref、reactive、computed方法
3. 自定义useCount方法，并导出
4. 在useCount方法中定义data、methods、computed，并return组件中需要的data、methods、computed
5. 组件中引入useCount.js
6. setup中return导入的data、methods、computed
7. template中使用data、methods、computed

// useCount.js
import {ref,reactive,computed} from 'vue'

export default function useCount() {
	// 简单数据定义及使用
	let count = ref(0)
	function addCount() {
		count.value++
	}

	// 复杂数据定义级修改
	let count_obj = reactive({
		val:10
	})
	let changeCountObj = ()=> {
		count_obj.val = count.value;
	}

	// 计算变量
	let count_dobule = computed(()=>{
		return count.value*2
	})
	return {count, addCount,count_obj, changeCountObj,count_dobule}
}

组件中使用

// Home.vue
<template>
    <div>
        <button @click="addCount">count is {{count}}</button>
        <button @click="changeCountObj">点击同步count值：{{count_obj.val}}</button>
        <div>count的两倍是：{{count_dobule}}</div>
    </div>
</template>

<script>
	import useCount from "./useCount";
	export default {
		setup() {
			let {count, addCount,count_obj,changeCountObj,count_dobule} = useCount();
			return {
				count, addCount,count_obj,changeCountObj,count_dobule
			}
		}
	}
</script>