子组件**

    1. <template>
    2.         <div class="Hello" @click="handleClick(num)">child</div>
    3. </template>
    5. <script lang="ts">
    6. import { Vue, Component, Emit } from 'vue-property-decorator'
    8. @Component({})
    9. export default class Hello extends Vue {
    10.    private num:number = 1
    11.    @Emit("onChild") send(num:number){};
    12.    handleClick(val:any){
    13.        this.num++;
    14.        this.send(val);
    15.    }
    16. }
    17. </script>

    父组件

    1. <Hello  @onChild="handleChild"/>
    2.   export default class App extends Vue {
    3.   handleChild(val:any){
    4.     console.log(val)
    5.   }
    7. }