Vue's methods and properties for parent components to call child components

Called with $ref
Direct code:

child components:
<template>
  <div>

  </div>
</template>

<script>
  export default {
    data(){
      return {
        num:'123'
      }
    },
    computed: {
    },
    components : {     
      'children': children
    },
    methods:{
      childMethod() {
        alert('childMethod do...')
      }
    },
    created(){
    }
  }
</script>



Parent component

Parent component: Add in child component ref can be called through this.$refs.ref.method
<template>
  <div @click="parentMethod">
    <children ref="c1"></children>
  </div>
</template>

<script>
  import children from 'components/children/children.vue'
  export default {
    data(){
      return {
      }
    },
    computed: {
    },
    components: {     
      'children': children
    },
    methods:{
      parentMethod() {

        console.log(this.$refs.c1) //The returned is a vue object, so its method can be called directly         this.$refs. c1.childMethod();         Similarly       }     },     created(){     }   } </script>