vue之组件之间的传值

1、父组件向子组件传值

//parent.vue
<template>
    <div>
        <child :send-msg-to-child="toChildMsg"></child>
    </div>
</template>
<script>
import child from './child.vue';
export default{
    name:'parent',
    props:[],
    data(){
        return {
            toChildMsg:'about data to child component'
        }
    },
    components:{
        child
    }
}
</script>
---------------------------------------------------
//child.vue
<template>
    <div>{{sendMsgToChild}}</div>
</template>
<script>
export default{
    name:'child',
    props:['sendMsgToChild'],
    data(){
        return {
            
        }
    },
    methods:{
    
    }
}
</script>

2、子组件向父组件传值

child.vue

<template>
    <div @click="up">向父组件传递数据</div>
</template>
<script>
import child from './child.vue';
export default{
    name:'child',
    props:[''],
    data(){
        return {
            
        }
    },
    methods:{
        up(){
            this.$emit('up-up','this is data to parent component')//主动触发upup事件，然后向父组件传递数据
        }
    }
}

</script>

---------------------------------------------------

parent.vue

<template>
    <div>
        <child @up-up="getDataFromChild"></child>/*监听子组件触发的upup事件，然后调用getDataFromChild方法获取数据*/
        <div>{{getChildMsg}}</div>
    </div>
</template>
<script>
import child from './child.vue';
export default{
    name:'parent',
    props:[],
    data(){
        return {
            getChildMsg:null
        }
    },
    components:{
        child
    },
    methods:{
        getDataFromChild(msg){
            this.getChildMsg = msg;
        }
    }
}
</script>

3、非父子组件之间的传值

bus.js

import Vue from 'vue'
const bus = new Vue();
export default  bus
---------------------------------------------------
component1.vue

<template>
    <div>
      
    </div>
</template>
<script>
import bus from '../javascript/bus.js'
export default{
    name:'component1',
    props:[],
    data(){
        return {
           
        }
    },
    components:{
        
    },
     methods:{
        bus.$emit('change','data to another component')
    }
}

</script>

---------------------------------------------------

component2.vue

<template>
    <div>
       {{getDataFromComponent}}
    </div>
</template>
<script>
import bus from '../javascript/bus.js'
export default{
    name:'component2',
    props:[],
    data(){
        return {
            getDataFromComponent:null
        }
    },
    components:{
        
    },
     methods:{
        bus.$on('change',msg=>{
            this.getDataFromComponent = msg;
        })
    }
}

</script>