1,路由的传参
（1） 查询字符串：
        /user/regist?uname=jack&upwd=123
接收：{{$route.query}}
（2） rest 风格传参
        /user/login/rose/456

  <div id='app'>
       <router-link to='/home'>首页</router-link>
       <router-link to='/user'>用户页</router-link>
        <router-view></router-view>
   </div>
<script src='js/vue.js'></script>
<script src='js/vue-router.js'></script>
<script>
   //2
    var Home={
        template:`
         <div>我是首页</div>
        `
    }
     var User={
        template:`
         <div>

              我是用户页
             <p>
                <router-link to='/user/regist?uname=jack&upwd=123'>注册</router-link>
              </p>
             <p>
                <router-link to='/user/login/rose/456'>登录</router-link>
              </p>
               <router-view></router-view>
         </div>
        `
    }
    var Regist={
        template:`
           <div>
           <h1>这是注册页面</h1>
           <a href="">{{$route.query}}</a>
           <a href="">uname:{{$route.query.uname}}</a>
           <a href="">upwd:{{$route.query.upwd}}</a>
          </div>
         `
    } 
     var Login={
        template:`
             <div>
               <h1>这是登录页面</h1>
               <a>{{$route.params}}</a>
               <a>{{$route.params.uname}}</a>
               <a>{{$route.params.upwd}}</a>
             </div>
            `
    }  
  //3.
     const routes=[
         {path:'/',component:Home},
         {path:'/home',component:Home},
         {
             path:'/user',
             component:User,
             children:[
                 {path:'regist',component:Regist},
                 {path:'login/:uname/:upwd',component:Login}
             ]
         }
     ]
   //4.创建实例
     const router=new VueRouter({
         routes:routes
     })
     
     
  new Vue({
      el:"#app",
      router:router
  })
</script>

2，axios
是vue中的 ajax ,1.0版本通过 vue-resource 来控制，2.0版本 通过 axios 制作，ajax 前端页面和后台数据做交互

  <div id='app'>
     <!--1.-->
     <router-link to='/home'>首页</router-link>
     <router-link to='/user'>用户页</router-link> 
    <!-- 盛放链接对应的内容-->
      <router-view></router-view>
  </div>
   <script src='js/vue.js'></script> 
   <script src='js/vue-router.js'></script>
   <script src='js/axios.js'></script>
   <script>
       //2.创建组件
   var Home={
       template:`
         <h1>这是首页</h1>
       `
   }
   
   var User={
       template:`
         <div>
            <h1>这是用户页</h1>
             <table border=1 cellspacing=0>
               <thead>
                   <tr>
                     <th>编号</th>
                     <th>品名</th>
                     <th>单价</th>
                     <th>数量</th>
                     <th>小计</th>
                   </tr>
               </thead>
               <tbody>
                  <tr v-for="value in list">
                     <td>{{value.num}}</td>
                     <td>{{value.pname}}</td>
                     <td>{{value.price}}</td>
                     <td>{{value.count}}</td>
                     <td>{{value.sub}}</td>
                  </tr>
               </tbody>
             </table>
         </div>
        `,
       data:function(){
           return{
              list:null
           }
       },
       mounted:function(){
           var self=this;
           axios({
               method:"get",//get post
               url:'fruit.json'
           }).then(function(resp){//请求成功
               console.log(resp.data)
               self.list=resp.data;
           }).catch(function(err){//请求失败
               console.log(err)
           })
       }
       
   }
   
   //3.配置路由
   const  routes=[
       {path:'/',component:Home},
       {path:'/home',component:Home},
       {path:'/user',component:User}
   ]
   
   //4.创建路由实例
   const router=new VueRouter({
       routes:routes,
       linkActiveClass:'active'
   })
   
   //5.路由实例挂载到vue实例上
   new Vue({
       el:'#app',
       router:router
   })   
   
</script>

json文件中书写：

[
    {
        "num":1,
        "pname":"banana",
        "price":3,
        "count":2,
        "sub":6
    },
    {
        "num":2,
        "pname":"pear",
        "price":5,
        "count":3,
        "sub":15
    },
    {
        "num":3,
        "pname":"apple",
        "price":4,
        "count":5,
        "sub":20
    }
]