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Vue组件通信

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一、组件间的通信方式分类

二、props传递数据

适用场景:父组件传递数据给子组件;

Person.vue

<template>
  <div>
    Person
    <Student1 name="jack" age="18"></Student1>
    </div>
</template>
<script>
import Student1 from './Student1'
export default {
    name: 'Person',
    components: {
        Student1,
    },
</script>

Student1.vue

<template>
  <div>
    Student1
    {{name}},{{age}}
  </div>
</template>
<script>
export default {
    name: 'Student1',
    props: {
        name: String,
        age:Number,
    }
}
</script>

效果

三、$emit 触发自定义事件

Student1.vue

<template>
  <div>
    Student1
    <button @click="giveData()">点我传递数据</button>
  </div>
</template>
<script>
export default {
    name: 'Student1',
    methods: {
        giveData() { 
            this.$emit('add', '12345');
        }
    },
}
</script>

Person.vue

<template>
  <div>
    Person
    <Student1 @add="cartAdd($event)"></Student1>
    </div>
</template>
<script>
import Student1 from './Student1'
export default {
    name: 'Person',
    components: {
        Student1,
    },
    methods: {
        cartAdd(event) { 
            console.log(event);
        }
    },
}
</script>

四、ref标记

<template>
  <div>
    Person
    <Student2 ref="foo"></Student2>
    <button @click="getRef()">点击获取ref数据</button>
  </div>
</template>
<script>
import Student2 from "./Student2";
export default {
  name: "Person",
  components: {
    Student2,
  },
  methods: {
    getRef() {
      console.log(this.$refs.foo);
    },
  },
};
</script>

效果

五、EventBus事件总线

main.js

beforeCreate() {
  Vue.prototype.$bus = this
}

Student2.vue

<template>
  <div>
    Student2
    <button @click="getBus()">点我获取全局事件总线数据</button>
  </div>
</template>
<script>
export default {
  name: 'Student2',
  data() {
    return {
      name: 'fanafan',
      age:'17'
    }
  },
  methods:{
    getBus(){
      this.$bus.$emit('bus',this.name)
    }
  }
}
</script>

Student1.vue

mounted() {
    this.$bus.$on('bus', (data) => { 
        console.log(data)
    })
},

六、$parent 或 $root

使用方法类似全局事件总结

Vue.prototype.$parent = this
// 传数据
this.$parent.$emit('parent',this.age)
//接数据
this.$parent.$on('parent', (data) => {
    console.log(data);
})

七、vuex

八、总结

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