路由：vue-router
vue的核心插件
vue-router.js
npm install vue
npm install vue-router
根据不同的url访问不同的页面
创建单页面SPA(SINGLE PAGE APPLICATION)应用

 <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="https://cdn.bootcss.com/vue/2.5.16/vue.js"></script>
<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>

   <script>
       //2.创建组件
       var Home={
           template:`
             <h1>这是首页</h1>
           `
       }

       var User={
           template:`
                <h1>这是用户页</h1>
            `
       }

       //3.配置路由
       const  routes=[
           {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>

style

<style>
/*
        .router-link-active{
            color:red;
        } 
*/
        .active{
            color:red;
        }
    </style>

路由的嵌套

  <div id='app'>
   <!--1.-->
   <router-link to='/index'>首页</router-link>
   <router-link to='/user'>用户页</router-link>
   <router-view></router-view>
  </div>
<script src="https://cdn.bootcss.com/vue/2.5.16/vue.js"></script>
<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>

   <script>
       //2.创建组件
       var  Index={
           template:`
             <h1>这是首页</h1>
           `
       }
       var User={
           template:`
           <div>
             <h1>这是用户页</h1>
             <ul>
               <li>
                  <router-link to='/user/regist'>注册</router-link>
               </li> 
                <li>
                  <router-link to='/user/login'>登录</router-link>
               </li>
            </ul>
            <router-view></router-view>
           </div>
         `
       }

       var Regist={
           template:`
             <h3>这是注册页</h3>
          `
       }

        var Login={
           template:`
             <h3>这是登录页</h3>
          `
       }

       //3.配置路由
       const routes=[
           {path:'/',component:Index},
           {path:'/index',component:Index},
           {
               path:'/user',
               component:User,
               children:[
                   {path:'regist',component:Regist},
                   {path:'login',component:Login}
               ]
           }
       ]

       //4.创建路由实例
       const router=new VueRouter({
           routes:routes
       })

       //5.把路由实例挂载到vue实例上
      new Vue({
          el:'#app',
          router:router//注册路由
      })
      </script>

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