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Implementation method for transferring data between Vue components (code)

不言forward: 2018-10-23 15:20:241827browse

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1. The child component passes data to the parent component

<body>
    <div id="app">
        父组件：{{total}}
        <br>
        <son-component v-bind:total="total"></son-component>
    </div>
    <script>
         Vue.component('son-component',{
            template:'<div>子组件：{{total}}+{{num}}={{add}}</div>',
            props:{
                total:Number
            },
            data(){
                return {
                    num:10
                }
            },
            computed:{
                add:function(){
                    return num=this.total+this.num
                }
            }
        })
        var app=new Vue({
            el:'#app',
            data:{
                total:1
            },
           
        })
    </script>
</body>

Dynamically binds the data to be passed in the parent component through v-bind, and the child component receives the data passed by the parent component through the props attribute.

2. The parent component passes data to the child component

<body>
    <div id="app">
        <son-component v-on:change="getData"></son-component>
        <br>
        {{total}}
    </div>
    <script>
        Vue.component('son-component',{
            template:'<button v-on:click=sendData>点击我向父组件传值</button>',
            data(){
                return{
                    count:1
                }
            },
            methods:{
                sendData:function(){
                    this.$emit('change',this.count)
                }
            }
        })
        var app=new Vue({
            el:'#app',
            data:{
                total:1
            },
            methods:{
                getData:function(value){
                    this.total=this.total+value
                }
            }
        })
    </script>
</body>

Customize an event, trigger the custom event in the child component through this.$emit() and give The parent component passes data, and custom events are listened to and received in the parent component.

3. Communication between non-parent and child components

<body>
    <div id="app">
            <a-component></a-component>
            <b-component></b-component>
    </div>
    <script>
        Vue.component('a-component',{
            template:`
                <div>
                    <span>a组件的数据：{{num}}</span><br>
                    <button v-on:click="sendData">击我向b组件传递数据</button>
                </div>
            `,
            data(){
                return {
                    num:1
                }
            },
            methods:{
                sendData:function(){
                    this.$root.bus.$emit('change',this.num)
                }
            }
        })
        Vue.component('b-component',{
            template:`
                <div>b组件接收a组件数据后相加的数据：{{count}}</div>
            `,
            data(){
                return {
                    count: 10
                }
            },
            created:function(){
                this.$root.bus.$on('change',(value)=>{
                    //alert(value)
                    this.count=this.count+value
                })
            }
        })
        var app=new Vue({
            el:'#app',
            data:{
                bus:new Vue()
            },
        })
    </script>
</body>

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