vue-property-decorator

一、@emit

import { Vue, Component, Emit } from 'vue-property-decorator'
 
@Component
export default class YourComponent extends Vue {
  count = 0
 
  @Emit()
  addToCount(n: number) {
    this.count += n
  }
 
  @Emit('reset')
  resetCount() {
    this.count = 0
  }
 
  @Emit()
  returnValue() {
    return 10
  }
 
  @Emit()
  onInputChange(e) {
    return e.target.value
  }
 
  @Emit()
  promise() {
    return new Promise(resolve => {
      setTimeout(() => {
        resolve(20)
      }, 0)
    })
  }
}

相当于js

export default {
  data() {
    return {
      count: 0
    }
  },
  methods: {
    addToCount(n) {
      this.count += n
      this.$emit('add-to-count', n)
    },
    resetCount() {
      this.count = 0
      this.$emit('reset')
    },
    returnValue() {
      this.$emit('return-value', 10)
    },
    onInputChange(e) {
      this.$emit('on-input-change', e.target.value, e)
    },
    promise() {
      const promise = new Promise(resolve => {
        setTimeout(() => {
          resolve(20)
        }, 0)
      })
 
      promise.then(value => {
        this.$emit('promise', value)
      })
    }
  }
}