//watch监听单个的属性，里面的data存在
<!DOCTYPE html>
<html>
    <head>
        <meta charset='utf-8'>
        <title></title>
        <!-- 引入vue.js -->
        <script src='https://cdn.jsdelivr.net/npm/vue/dist/vue.js'></script>
        <!-- 引入路由模块 -->
        <script src="https://unpkg.com/vue-router/dist/vue-router.js"></script>
    </head>
    <body>
        <div id='app'>
            <router-link to="/login">登录</router-link>
            <router-link to="/register">注册</router-link>
            <router-view></router-view>
        </div>
    
    </body>
    <script> // 创建组件模板对象 let login = { template:"<h1>登录组件</h1>", } let register = { template:"<h1>注册组件</h1>", } let router = new VueRouter({ routes:[ {path:'/',redirect:'login'}, {path:'/login',component:login}, {path:'/register',component:register} ] }) // 实例化vue对象 let vm = new Vue({ // 绑定对象 el:'#app', data:{ }, methods:{ }, router, watch:{ //绑定了路由的路径，然后可以监听前后的路径的变化 "$route.path":function(newVal,oldVal){ console.log("new:"+newVal+"--old:"+oldVal) if(newVal == "/login"){ console.log("欢迎进入登录页面") }else if(newVal == "/register"){ console.log("欢迎进入注册页面") } } } }) </script>
</html>