vue中组件通信详解(父子组件, 爷孙组件, 兄弟组件)

Vue.component('child', {
 props: ['fname'],
 template: `
  <div class="child">
   这是儿子, 我爸爸是{{fname}}
   <button @click="$emit('toFather')">点我通知爸爸</button>
  </div>
 `
})

Vue.component('father', {
 data() {
  return {
   info: '无消息'
  }
 },
 template: `
  <div class="father">
   这是父亲, {{info}}
   <child fname="father" @toFather="getSonMsg"></child>
  </div>
 `,
 methods: {
  getSonMsg() {
   this.info = '我收到儿子传来的消息了'
  }
 }
})
new Vue({
 el: '#app',
})

<div id="app">
  <father></father>
 </div>

Vue.component('up', {
 data() {
  return {
   msg: '未传递消息'
  }
 },
 template: `
  <div class="up">
   <p>这是up组件, 下一行为down传递的消息</p>
   <p>{{msg}}</p>
  </div>
 `,
 mounted() {
  this.bus.$on('send', (msg)=> {
   this.msg = (msg)
  })
 }
})

Vue.component('down', {
 template: `
  <div class="down">
   <p>这是down</p>
   <button @click="toUp">点击我向up组件传递消息</button>
  </div>
 `,
 methods: {
  toUp() {
   this.bus.$emit('send', 'down来消息了')
  }
 }
})
new Vue({
 el: '#app',
})

<div id="app">
  <up></up>
  <down></down>
 </div>