Vue3：【props、emit 和 components】 在 setup 语法糖和非语法糖中的使用

1 props

1.1 setup 语法糖

<script lang="ts" setup>

interface PersionItem {
  id: number
  value: number
  imageSrc: string
  label: string
}
const props = defineProps({
  personData: {
    type: Array as () => PersionItem[],
    default: () => []
  }
})

console.log(props.personData)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

1.2 非语法糖

<script lang="ts">

interface Option {
  imageSrc: String
  fileName: String
  modifierInfo: String
  path: String
  origin: String
}
export default {
  props: {
    listData: {
      type: Array as () => Option[],
      default: () => []
    }
  },
  setup(props, { emit }) {
    console.log(props.listData)
    return {}
  }
}
</script>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

2 emit

2.1 setup 语法糖

<script lang="ts" setup>
import { defineEmits } from 'vue'
// 定义
const emit = defineEmits(['checkPerson'])

const check = () => {
  emit('checkPerson', personID.value)
}
</script>
1
2
3
4
5
6
7
8
9
10

2.2 非语法糖

<script lang="ts">
export default {
  emits: ['focusEvent', 'blurEvent'],
  setup(props, { emit }) {
    // const emit = defineEmits(['debouncedInput', 'focusEvent', 'blurEvent'])
    // 获得焦点事件
    const focusFn = () => {
      emit('focusEvent')
    }
    // 失去焦点事件
    const blurFn = () => {
      emit('blurEvent')
    }

    return {  focusFn, blurFn }
  }
}
</script>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

3 components 组件

3.1 语法糖

引入后直接用

3.2 非语法糖

<script lang="ts">
import fileNameItem from './fileNameItem.vue'

export default {
  // 局部注册组件
  components: {
    fileNameItem
  },
  setup(props, { emit }) {
    return {}
  }
}
</script>
1
2
3
4
5
6
7
8
9
10
11
12
13