How does vue router output data values?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
<div id="app">
  <h1>Hello App!</h1>
  

    <router-link to="/foo">Go to Foo</router-link>
    <router-link to="/bar?a=b">Go to Bar</router-link>
  

  <router-view></router-view>
</div>
<script id="foo" type="text/template">
    <h1>Hello, {{bigfoot}}</h1>
</script>
<script id="bar" type="text/template">
    <h1>Hello2, {{nani}}</h1>
</script>
<script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.min.js"></script>
<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.min.js"></script>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script>
var Foo = { template: $("-sharpfoo").html() };
var Bar = { template: $("-sharpbar").html() };

var routes = [
  { path: "/foo", component: Foo },
  { path: "/bar", component: Bar }
];

var router = new VueRouter({
  routes:routes 
});

new Vue({
    el: "-sharpapp",
    data: {
        bigfoot: "",
        nani: ""
    },
    router: router
});

</script>
</body>
</html>

error bigfoot or nani undefined will be reported above

Vue.js vue-router
Feb.27,2021

your data is defined in the root component and needs to be defined in the subcomponent

to write: https://codepen.io/anon/pen/M.

.

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