在vue+webpack中公用一个组件问题（详细教程）

npm install -g vue-cli

cd vue_test_project //进入vue_test_project目录下
vue init webpack vuedemo //在vue_test_project目录下创建一个vuedemo工程

cd vuedemo
npm install

npm run dev

<template>
 <p class="hello">
 <h1>{{ msg }}</h1>
 <h2>Essential Links</h2>
 <p class="btn">
  <router-link :to="{name:'content',params:{differId:'con1'}}">内容按钮1</router-link>
  <router-link :to="{name:'content',params:{differId:'con2'}}">内容按钮2</router-link>
 </p>
 <router-view></router-view>
 </p>
</template>
<script>
export default {
 name: 'HelloWorld',
 data () {
 return {
 msg: 'Welcome to Your Vue.js App'
 }
 }
}
</script>
<style scoped>
h1, h2 {
 font-weight: normal;
}
ul {
 list-style-type: none;
 padding: 0;
}
li {
 display: inline-block;
 margin: 0 10px;
}
a {
 color: #42b983;
}
</style>

import Vue from 'vue'
import Router from 'vue-router'
import HelloWorld from '@/components/HelloWorld'
import content from '@/components/conDetail'
Vue.use(Router)
export default new Router({
 routes: [
 {
 path: '/',
 name: 'HelloWorld',
 component: HelloWorld,
 children:[
  {name:'content',path:'content/:differId',component:content}
 ]
 }
 ]
})

<template>
 <p class="same">
 这个是相同的内容
 <p class="conlist">
  <template v-for="item in items">
  <p>{{item.con}}</p>
  </template>
 </p>
 </p>
</template>
<script>
export default {
 name: 'conDetail',
 data () {
 return {
 msg: '',
 differIdType:'',
 conlist:[
  {'con':'这是第一个内容按钮的内容1'},
  {'con':'这是第一个内容按钮的内容2'}
 ],
 items:[], 
 }
 },
 mounted(){
  this.differIdType = this.$route.params.differId == 'con1' ? '0' : '1';
  if(this.differIdType == 0){
  this.items = this.conlist;
  }else{
  this.items = [];
  }
 },
 watch:{
 $route:function(to,from){
  this.differIdType = to.params.differId == 'con1' ? '0' : '1'; 
  if(this.differIdType == 0){
  this.items = this.conlist;
  }else{
  this.items = [];
  } 
 }
 }
}
</script>
<style>
</style>

const User = {
 template: '...',
 watch: {
 '$route' (to, from) {
  // 对路由变化作出响应...
 }
 }
}

const User = {
 template: '...',
 beforeRouteUpdate (to, from, next) {
 // react to route changes...
 // don't forget to call next()
 }
}