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ComponentC.vue
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ComponentC.vue
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<script setup lang="ts">
import { reactive,ref } from '@vue/reactivity'
import { computed } from '@vue/runtime-core'
const author = reactive({
name:"作者计算属性",
books:[
'vue2-Advanced Guide',
'vue3-Basic Guide',
'Vue4-The Mystery'
]
})
// 组件中
function calculateBooksMessage() {
return author.books.length > 0 ? 'Yes' : 'No'
}
const publishedBooksMessage = computed<string>(calculateBooksMessage)
const now = computed(() => Date.now())
// 可写的计算属性
const firstName = ref('John')
const lastName = ref('Doe')
const fullName = computed({
// getter
get() {
return firstName.value + ' ' + lastName.value
},
// setter
set(newValue:string) {
// 注意:我们这里使用的是解构赋值语法
[firstName.value, lastName.value] = newValue.split(' ')
}
})
fullName.value = '江 武汉'
let a:Array<string> = fullName.value.split(' ')
console.log(a)
console.log(firstName.value,lastName.value)
</script>
<template>
<div>
<p>Has published books</p>
<span>{{author.books.length > 0 ?'Yes':'No'}}</span><br/>
<span>{{publishedBooksMessage}}</span><br/>
<span>{{now}}</span>
</div>
</template>
<style scoped>
</style>