ERP_override.git

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			<template>
			<div>
			{{ a }}
			<br><br>
			{{ result }}
			<br><br>
			{{ b }}
			<br><br>
			<el-button @click="b++">123123</el-button>

			<br><br>
			{{ '父组件传值给子组件：'+car }}

			<br><br>
			<el-button @click="gaveParent">子组件传递数据给父组件</el-button>
			</div>
			</template>
			<script setup>
			import {ref,computed,watch,defineProps,defineEmits} from 'vue'
			let a = $ref([1,2,3,4,5,6])
			let b =ref(0)

			let props = defineProps({
			car:{
			String,
			default:0
			}
			})

			const emit = defineEmits(['changeNum'])
			const gaveParent = () => {
			emit('changeNum','子组件给父组件传值了')
			}

			//使用计算属性过滤出数组中小于2的
			const result=computed( () => {
			return a.filter(item => item>2)
			})

			watch(b,(newValue,oldValue) => {
			console.log("改变了当前值："+newValue+" "+oldValue)
			})

			</script>
			<style scoped>

			</style>