Vue3如何处理重复渲染代码的问题

<template>
<div v-for="item in data" :key="item.age">
	<span>{[ item.name }}</span>
	<span>今年已经 </span>
	<span>{[ item.age }}</span>
	<span>岁啦</span>
</div>
</template>
<script setup lang="ts">
const data = new Array(20).fill(0).map((_, index) => ({
name:`sunshine-${index}`,
age: index
}));
</script>

<template>
<div>
	<div v-for="item in data" :key="item.age">
		<span>{{ item.name }}</span>
		<span>今年已经 </span>
		<span>{{ item.age }}</span>
		<span>岁啦</span>
	</div>
	<!-- 多处使用 -->
	<div v-for="item in data" :key="item.age">
		<span>{[ item.name }}</span>
		<span>今年已经 </span>
		<span>{{ item.age }}</span>
		<span>岁啦</span>
	</div>
	<!-- 多处使用 -->
	<div v-for="item in data" :key="item.age">
		<span>{[ item.name }}</span>
		<span>今年已经 </span>
		<span>{[ item.age }}</span>
		<span>岁啦</span>
	</div>
	<!-- 多处使用 -->
	<div v-for="item in data" :key="item.age">
		<span>{ item.name }}</span>
		<span>今年已经 </span>
		<span>{[ item.age }}</span>
		<span>岁啦</span>
	</div>
</div>
</temple>

<!-- Item.vue -->
<template>
<div>
	<span>{{ name }}</span>
	<span>今年已经 </span>
	<span>{ age }}</span>
	<span>岁啦</span>
</div>
</template>
<script lang="ts" setup>defineProps({
name: {
type: String,
default:'',
},
age: {
type:Number
default:0,
};
})
</script>

<template>
<div>
<Item v-for="item in data" :key="item.age" :age="item.age" :name="item.name" /></div>
</template>
<script setup lang="ts">
import Item from './Item.vue';
const data = new Array(20).fill(0).map((_, index) => ({
name:`sunshine-${index}`,
age: index
</script>

<template>
<div>
	<!-- 在本组件中定义一个复用模板 -->
	<DefineTemplate v-slot="[ age, name }">
		<div>
		<span>{{ name }}</span>
		<span>今年已经 </span>
		<span>{{ age }}</span>
		<span>岁啦</span>
		</div>
	</DefineTemplate>
	<!-- 可多次使用复用模板 -->
	<ReuseTemplate v-for="item in data" :key="item.age" :age-"item.age" :name-"item.name">
	<ReuseTemplate v-for="item in data" :key="item,age" :age="item,age" :name-"item, name">
	<ReuseTemplate v-for="item in data" :key="item.age" :age="item.age" :name="item.name">
</div>
</template>

<script setup lang="ts">
import { useTemplate } from '@/hooks/useTemplate';
const data = new Array(20).fill(0).map((_, index) => ({
name:`sunshine-$[index}`,
age: index,
});
const [DefineTemplate， ReuseTemplate] = useTemplate();
</script>

import { defineComponent， shallowRef } from 'vue';
import { camelCase } from 'lodash';
import type { Slot } from 'vue';
//将横线命名转大小驼峰
function keysToCamelKebabCase(obj: Record<string，any>)[
	const newObj: typeof obj = ;for (const key in obj) newObj[camelCase(key)] = obj[key];
	return newObj;
}
export const useTemplate = () => {
	const render = shallowRef<Slot undefined>();
	const define = defineComponent({
	setup(_,[ slots }) {
		return () => {
			//将复用模板的渲染函数内容保存起来
			render.value = slotsdefault;
			}
		}
	})
	const reuse = defineComponent({
		setup(_, [ attrs, slots }) {
			return () => {
				// 还没定义复用模板，则抛出错误
				if (!render.value){
					throw new Error( 你还没定义复用模板呢!);
				}
				// 执行渲染函数，传入 attrs、slots
				const vnode = render.value([ ...keysToCamelKebabCase(attrs), $slots: slots });
				return vnode.length === 1 ? vnode[0] : vnode;
			}
		},
	});
	return [define reuse];
}

import { defineComponent, shallowRef } from 'vue';
import { camelCase } from 'lodash';
import type { DefineComponent, Slot } from 'vue';

// 将横线命名转换为驼峰命名
function keysToCamelKebabCase(obj: Record<string, any>) {
  const newObj: typeof obj = {};
  for (const key in obj) newObj[camelCase(key)] = obj[key];
  return newObj;
}

// 定义 DefineTemplateComponent 类型，该类型表示定义模板的组件
export type DefineTemplateComponent<
  Bindings extends object,
  Slots extends Record<string, Slot | undefined>,
> = DefineComponent<object> & {
  new (): { $slots: { default(_: Bindings & { $slots: Slots }): any } };
};

// 定义 ReuseTemplateComponent 类型，该类型表示复用模板的组件
export type ReuseTemplateComponent<
  Bindings extends object,
  Slots extends Record<string, Slot | undefined>,
> = DefineComponent<Bindings> & {
  new (): { $slots: Slots };
};

// 定义 ReusableTemplatePair 类型，表示一个定义模板和复用模板的组件对
export type ReusableTemplatePair<
  Bindings extends object,
  Slots extends Record<string, Slot | undefined>,
> = [DefineTemplateComponent<Bindings, Slots>, ReuseTemplateComponent<Bindings, Slots>];

// useTemplate 函数，返回一个定义模板和复用模板的组件对
export const useTemplate = <
  Bindings extends object,
  Slots extends Record<string, Slot | undefined> = Record<string, Slot | undefined>,
>(): ReusableTemplatePair<Bindings, Slots> => {
  const render = shallowRef<Slot | undefined>();

  // 定义 DefineTemplateComponent 组件
  const define = defineComponent({
    setup(_, { slots }) {
      return () => {
        // 将复用模板的渲染函数内容保存起来
        render.value = slots.default;
      };
    },
  }) as DefineTemplateComponent<Bindings, Slots>;

  // 定义 ReuseTemplateComponent 组件
  const reuse = defineComponent({
    setup(_, { attrs, slots }) {
      return () => {
        // 还没定义复用模板，则抛出错误
        if (!render.value) {
          throw new Error('你还没定义复用模板呢！');
        }
        // 执行渲染函数，传入 attrs、slots
        const vnode = render.value({ ...keysToCamelKebabCase(attrs), $slots: slots });
        return vnode.length === 1 ? vnode[0] : vnode;
      };
    },
  }) as ReuseTemplateComponent<Bindings, Slots>;

  return [define, reuse];
};