<template>
  <div>
    <child></child>
  </div>
</template>
<script>
  import child from './components/childcomponent';
  export default {
    components: {
      child
    },
    methods: {
      fatherMethod() {
        console.log('父組件方法');
      }
    }
  };
</script>

子組件

<template>
  <div>
    <button @click="childMethod()">點擊按鈕</button>
  </div>
</template>
<script>
  export default {
    methods: {
      childMethod() {
        this.$parent.fatherMethod();
      }
    }
  };
</script>

2.子組件用“$emit”向父組件觸發(fā)一個事件,父組件監(jiān)聽這個事件即可。

父組件

<template>
  <div>
    <child @fatherMethod="fatherMethod"></child>
  </div>
</template>
<script>
  import child from './components/childcomponent'
  export default {
    components: {
      child
    },
    methods: {
      fatherMethod() {
        console.log('父組件方法');
      }
    }
  };
</script>

子組件

<template>
  <div>
    <button @click="childMethod()">點擊按鈕</button>
  </div>
</template>
<script>
  export default {
    methods: {
      childMethod() {
        this.$emit('fatherMethod');
      }
    }
  };
</script>

3.父組件把方法傳入子組件中,在子組件里直接調(diào)用這個方法即可。

父組件

<template>
  <div>
    <child :fatherMethod="fatherMethod"></child>
  </div>
</template>
<script>
  import child from './components/childcomponent';
  export default {
    components: {
      child
    },
    methods: {
      fatherMethod() {
        console.log('父組件方法');
      }
    }
  };
</script>

子組件

<template>
  <div>
    <button @click="childMethod()">點擊按鈕</button>
  </div>
</template>
<script>
  export default {
    props: {
      fatherMethod: {
        type: Function,
        default: null
      }
    },
    methods: {
      childMethod() {
          this.fatherMethod();
        }
      }
    }
  };
</script>