Vue 兄弟组件通信的方法（不使用Vuex）

<template>
 <div class="adiv">
 <p>a组件</p>
 <button type="button" v-on:click="handleClick">点击打开组件b弹窗</button>
 </div>
</template>

<script>

export default {
 methods: {
 handleClick () {
  this.$emit('isLogFn','log')
 }
 }
}
</script>

<style>
.adiv{
 width: 400px;
 height: 200px;
 border: 1px solid #000;
 margin: 0 auto;
}
</style>

<template>
 <div id="app">
 <aPage @isLogFn = "lisLogFn"></aPage>
 <bPage :isLog = "login"></bPage>
 </div>
</template>

<script>

import aPage from './components/a.vue'
import bPage from './components/b.vue'

export default {
 data () {
 return {
  login: 'false'
 }
 },
 name: 'app',
 components: {
 aPage,
 bPage
 },
 methods: {
 lisLogFn (data) {
  if (data == 'log') {
  this.login = 'true'
  }
 }
 }
}
</script>

<style>
</style>

<template>
 <div class="bdiv" v-show="isLogin">我是组件B弹窗</div>
</template>

<script>
export default {
 props: ['isLog'],
 data () {
 return {

 }
 },
 computed: {
 isLogin () {
  if(this.isLog == 'true'){
  return true
  } else {
  return false
  }
 }
 }
}
</script>

<style>
 .bdiv{
 width: 200px;
 height: 200px;
 border: 1px #000 solid;
 margin: 0 auto;
 }

</style>