Vue2 组件通信方式

props/emit

props

作用：父组件通过 props 向子组件传递数据

parent.vue

<template><div><Son :msg="msg" :pfn="pFn"></Son></div>
</template><script>
import Son from './son'
export default {name: 'Parent',data() {return {msg:'a message'}},methods: {pFn(){console.log("这是pFn");}},components:{Son}
}
</script><style></style>

son.vue

<template><div><h3>p的msg：{{ msg }}</h3><el-button type="primary" size="default" @click="pfn">点击使用p的方法</el-button></div>
</template><script>
export default {name: 'Son',props:['pfn','msg']
}
</script><style></style>

效果

emit

作用：子组件通过 $emit 和父组件通信

parent.vue

<template><div><Son :msg="msg"  @onSendData="onSendData"></Son></div>
</template><script>
import Son from './son'
export default {name: 'Parent',data() {return {msg:'a message'}},methods: {},components:{Son},methods: {onSendData(val){console.log(val);}},
}
</script><style></style>

son.vue

<template><div><h3>p的msg：{{ msg }}</h3><el-button type="primary" size="default" @click="sendData">点击向p发送数据</el-button> </div>
</template><script>
export default {name: 'Son',props:['msg'],created() {console.log(this);},methods: {sendData(){this.$emit("onSendData",'data from son')}},
}
</script><style></style>

效果

ref / $refs

作用:这个属性用在子组件上，它的用用就指向了子组件的实例，可以通过实例来访问组件的数据和方法

parent.vue

<template><div><Son ref="Son"></Son></div>
</template><script>
import Son from './son.vue';
export default {name: 'Parent',components:{Son,},mounted() {console.log("this.$refs.Son",this.$refs.Son.msg);this.$refs.Son.sayHi();},}
</script><style></style>

son.vue

<template><div><h3>p的msg：{{ msg }}</h3></div>
</template><script>
export default {name: 'Son',data() {return {msg:"a message from son"}},methods: {sayHi(){console.log("hello");}},
}
</script><style></style>