子组件里直接调用父组件事件的几种方法

组件里直接调用父组件事件的几种方法

1.在子组件里用$emit向父组件传递一个个事件,父组件监听这个事件就行了。
父组件:

<template>
  <div>
    <child @father="father"></child>
  </div>
</template>
<script>
  import child from './components/child';
  export default {
    
    
    components: {
    
    
      child
    },
    methods: {
    
    
      father() {
    
    
        console.log('这是父组件呀');
      }
    }
  };
</script>

子组件:

<template>
  <div>
    <button @click="child()">点击</button>
  </div>
</template>
<script>
  export default {
    
    
    methods: {
    
    
      child() {
    
    
        this.$emit('father');
      }
    }
  };
</script>

2.父组件将方法传入子组件中,子组件直接调用这个方法

父组件:

<template>
  <div>
    <child :father="father"></child>
  </div>
</template>
<script>
  import child from './components/child';
  export default {
    
    
    components: {
    
    
      child
    },
    methods: {
    
    
      father() {
    
    
        console.log('这是父组件呀');
      }
    }
  };
</script>

子组件:

<template>
  <div>
    <button @click="child()">点击</button>
  </div>
</template>
<script>
  export default {
    
    
    props: {
    
    
      father: {
    
    
        type: Function,
        default: null
      }
    },
    methods: {
    
    
      child() {
    
    
        if (this.father) {
    
    
          this.father();
        }
      }
    }
  };
</script>

3.直接在子组件中通过this.$parent.event来调用父组件的方法

父组件:

<template>
  <div>
    <child></child>
  </div>
</template>
<script>
  import child from './components/child';
  export default {
    
    
    components: {
    
    
      child
    },
    methods: {
    
    
      father() {
    
    
        console.log('这是父组件呀');
      }
    }
  };
</script>

子组件:

<template>
  <div>
    <button @click="child()">点击</button>
  </div>
</template>
<script>
  export default {
    
    
    methods: {
    
    
      child() {
    
    
        this.$parent.father();
      }
    }
  };
</script>