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Use of custom events in Vue components.

 The parent component uses props to pass data (such as a method) to the child component, and the child component needs to use custom events to pass data back to the parent component! We can use v-on to bind custom events, and then pass them to subcomponents, which will call after receiving the method. Each Vue instance implements the Events interface, that is: use $on(eventName) to listen for events and $emit(eventName) to trigger events.

Ways to use props

//App.vue
<template>
  <div>
    <Son :sendToSon="sendToSon"></Son>
  </div>
</template>
methods: {
  sendToSon(prams){
    console.log(prams)
  }
},
//Son.Vue
<template>
  <div>
    <button @click="sendToFather">Send</button>
  </div>
</template>
<script>
export default {
  name:"Son",
  props:["sendToSon"],
  data () {
    return {
      name: 'hello!!!'
    }
  },
  methods: {
    sendToFather(){
      this.sendToSon(this.name)
    }
  },
}
</script>

Use the ref attribute to complete

//App.vue
<template>
  <div>
    <Son ref="son"></Son>
  </div>
</template>
methods: {
  sendToSon(prams){
    console.log(prams)
  }
},
 mounted() {
    setTimeout(()=>{
      this.$refs.son.$on("fun1",this.sendToSon)
    },2000)
  }
//Son.vue
<template>
  <div>
    <button @click="sendToFather">Send</button>
  </div>
</template>
<script>
export default {
  name:"Son",
  data () {
    return {
      name: 'hello!!!'
    }
  },
  methods: {
    sendToFather(){
      this.$(emit)("fun1",this.name)
    }
  },
}
</script>

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