Vue - 组件之间的传值方式

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在vue项目中,组件之间的传值是非常常用且重要的,本文主要介绍一下各种组件之间的传值方式

1.父组件向子组件传值

父组件: fatherPage.vue

<template>
    <!-- 引入子组件 -->        
    <add-course :classCourseName="classCourseName"></add-course>
</template>
<script>
    import addCourse from './addCourse'
    export default {
        name: 'index',
        data() {
            return {
                
            }
        },
        components: {
            addCourse
        }
    }
</script>

子组件addCourse.vue

<template>
   <div class="up_load_dialog"> 
        <span>{{classCourseName}}</span>
   </div>
</template>
<script>
    export default {
        name: 'addCourseIndex',
        props: {
            //从父组件接收值
            classCourseName: {
                type: String,
                default: ()=>{
                    return ''
                }
            }
        },
        data(){
            return {

            }
        }
    }
</script>


2.子组件向父组件传值

子组件addCourse.vue

<template>
    <div class="up_load_dialog">
        <span @click="setNewCourse"></span>
    </div>
</template>
<script>
    export default {
        data(){
            return {
                childName: '我是子组件的数据'
            }
        },
        methods: {
            setNewCourse() {
                //通过emit的getValue方法将值childName传给父组件
                this.$emit('getValue', this.childName)
            }
        }
    }
</script>

父组件fatherPage.vue

<template>
    <add-course @getValue="getValue"></add-course>
</template>
<script>
    export default {
        data(){
            return {
                name: ''
            }
        },
        methods: {
            getValue(value) {
                this.name = value
                alert("成功接收到子组件传来的值")
            }
        }
    }
</script>


3.非父子组件之间传值

公共组件在config中加入event-bus.js

import Vue from 'vue'
let eventBus = new Vue();
eventBus.install = function (vue, options) {    
    Vue.prototype.$eventBus = Vue.eventBus = eventBus;
}
export default eventBus

在main.js中引入event-bus.js

const Vue = require('vue')
import router from './router'
import store from './store'
const Vuetify = require('vuetify')
import 'material-design-icons-iconfont'
import '../src/assets/css/base.css'
import ajax from './config/fetch.js'
import './config/filters.js'
import './config/directives'
import api from './config/api/index'
const echarts = require('echarts/lib/echarts')
import common from './config/common'
import EventBus from './config/event-bus.js'
...
Vue.use(EventBus);

如果不想用以上的方式,也可以建一个eventBus.js,然后在每个需要用到的页面引入该文件也可以

传值的particialAnalysis.vue

<template>    
    <div class="edit-partial-analysis">        
        <div class="edit-score-title clear">            
            <h3>偏科分析</h3>            
            <div class="edit-score-button">                
                <span class="edit-score-button-save" @click="saveScorePage">保存</span>            
            </div>         
    </div>
</template>
<script>
    export default {    
        name: 'editPartialAnalysis',    
        data() {        
            return {            
                number: ''       
            }    
        },     
        methods: {        
            // 保存设置的分数段        
            saveScorePage() {            
                this.$eventBus.$emit('editParamsButton', false); //传给兄弟editModule,告知隐藏设置参数页面                   
            },    
        }
    }
</script>


接收值的editModule.vue

<template>    
    <div class="score-analysis-con-one" :class="{hideSetAndParams: editParamsHideButton == true}">            
        <span v-if="editParamsHideButton">接收eventBus传过来的值</span>  
    </div>
</template>   
<script>        
    export default {        
    name: 'index',     
    data() {            
        return {                 
            editParamsHideButton: true,            
        }        
    },        
    mounted() {            
        //设置参数页面点击返回隐藏设置参数的页面            
        this.$eventBus.$on('editParamsButton',(data)=>{                
            this.editParamsHideButton = data;            
        })        
    },   
}
</script>


差不多就这样了,下次再写一下vuex的存值,加上组件传值,真的敲好用~