Vue父组件触发子组件中的实现方法

<!-- 父组件 -->
<template>
  <div>
    <button @click="callChildMethod">调用子组件方法</button>
    <child-component ref="child"></child-component>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue'

export default {
  components: {
    ChildComponent
  },
  methods: {
    callChildMethod() {
		this.$refs.child.childMethod();	//不传参
		this.$refs.child.childMethodParam(param);	//可以直接向子组件传递参数param
    }
  }
}
</script>

<!-- 子组件 -->
<template>
  <div>
    <!-- 组件内容 -->
  </div>
</template>

<script>
export default {
  methods: {
    childMethod() {
      console.log('子组件方法被调用')
    },

	childMethodParam(param) {
     console.log('子组件方法被调用，并接收到父组件传递过来的参数：',param)
   }
  }
}
</script>

<!-- 父组件 -->
<template>
  <div>
    <button @click="callChildMethod">调用子组件方法</button>
    <child-component @custom-event="onCustomEvent"></child-component>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue'

export default {
  components: {
    ChildComponent
  },
  methods: {
    callChildMethod() {
      this.$emit('custom-event')
    },
    onCustomEvent() {
      console.log('custom-event 事件被触发')
    }
  }
}
</script>

<!-- 子组件 -->
<template>
  <div>
    <!-- 组件内容 -->
  </div>
</template>

<script>
export default {
  props: ['customEvent'],
  created() {
    this.$on('custom-event', this.childMethod)
  },
  methods: {
    childMethod() {
      console.log('子组件方法被调用')
    }
  }
}
</script>