vue实现两个组件之间数据共享和修改操作

 handleSelect(key, keyPath) {
  console.log(key, keyPath);
  this.changeIndex(keyPath[1])
  },
  changeIndex:function(key) {
  this.$emit("IndexChanged",key)
  }

<template>
 <div id="app">
 
 </div>
</template>
<script>
 export default{
 name:'Test',
 mounted() {

 },
 }
</script>

<style>
</style>

<template>

</template>

<script>
 export default {
 name: "Test2"
 }
</script>

<style scoped>
</style>

import Test from "../components/Test";
Vue.use(Router)

export default new Router({
 mode: 'history',
 routes: [
{
 path: '/t',
 name: 'Test',
 component: Test
 }
 ]
})

import Test2 from "./components/Test2";

Vue.use(Test2)
new Vue({
 el: '#app',
 router,
 components: {
 App,
 
 "Test2":Test2

 },

 template: '<App/>'
})

<template>
<div>
 {{text2}}
</div>
</template>

<script>
 export default {
 name: "Test2",
 data(){
  return{
  text2:"这是Test2页面"
  }
 }

 }
</script>
<style scoped>

</style>

<template>
 <div id="app">
 {{text1}}
 <Test2></Test2>

 </div>
</template>
<script>

 import Test2 from "./Test2";
 export default{
 name:'Test',
 components: {Test2},
 data(){
  return{
  text1:"这是Test1页面"
  }
 },
 mounted() {
 },
 }
</script>

<style>
</style>

<template>
<div>
 {{text2}}
 {{text1}}
</div>
</template>

<script>
 export default {
 name: "Test2",
 props: ['text1'],
 data(){
  return{
  text2:"这是Test2页面"
  }
 }

 }
</script>

<style scoped>
</style>

<Test2 v-bind:text1="text1" v-on:textChanged="change($event)"></Test2>
....
methods: {
  change(msg){
  this.text1 = msg;
  }

 },

mounted() {
  this.$emit("textChanged","我改了text1的值")
 }