Vue.js 3で始めるフロントエンド開発【セットアップからルーティングまで】

npm install -g @vue/cli

cd workspace

vue create my-vue-app

cd my-vue-app

dir src/components

<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <p>
      For a guide and recipes on how to configure / customize this project,<br>
      check out the
      <a href="https://cli.vuejs.org" target="_blank" rel="noopener">vue-cli documentation</a>.
    </p>
    <h3>Installed CLI Plugins</h3>
    <ul>
      <li><a href="https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-babel" target="_blank" rel="noopener">babel</a></li>
      <li><a href="https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-eslint" target="_blank" rel="noopener">eslint</a></li>
    </ul>
    <h3>Essential Links</h3>
    <ul>
      <li><a href="https://vuejs.org" target="_blank" rel="noopener">Core Docs</a></li>
      <li><a href="https://forum.vuejs.org" target="_blank" rel="noopener">Forum</a></li>
      <li><a href="https://chat.vuejs.org" target="_blank" rel="noopener">Community Chat</a></li>
      <li><a href="https://twitter.com/vuejs" target="_blank" rel="noopener">Twitter</a></li>
      <li><a href="https://news.vuejs.org" target="_blank" rel="noopener">News</a></li>
    </ul>
    <h3>Ecosystem</h3>
    <ul>
      <li><a href="https://router.vuejs.org" target="_blank" rel="noopener">vue-router</a></li>
      <li><a href="https://vuex.vuejs.org" target="_blank" rel="noopener">vuex</a></li>
      <li><a href="https://github.com/vuejs/vue-devtools#vue-devtools" target="_blank" rel="noopener">vue-devtools</a></li>
      <li><a href="https://vue-loader.vuejs.org" target="_blank" rel="noopener">vue-loader</a></li>
      <li><a href="https://github.com/vuejs/awesome-vue" target="_blank" rel="noopener">awesome-vue</a></li>
    </ul>
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  props: {
    msg: String
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h3 {
  margin: 40px 0 0;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>

npm run serve

<template>
  <div>
    <h1>{{ message }}</h1>
    <button @click="changeMessage">メッセージを変更する</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      message: "こんにちは、Vue!"
    };
  },
  methods: {
    changeMessage() {
      this.message = "Hello, Vue!";
    }
  }
};
</script>

<style scoped>
h1 {
  color: blue;
}
</style>

npm run serve

<template>
  <div>
    <h1>{{ message }}</h1>
    <button @click="changeMessage">メッセージを変更する</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      message: "こんにちは、Vue!"
    };
  },
  methods: {
    changeMessage() {
      this.message = "Hello, Vue!";
    }
  }
};
</script>

npm install vue-router

mkdir src/router
touch src/router/index.js

import { createRouter, createWebHistory } from 'vue-router';
import Home from '../views/Home.vue';
import About from '../views/About.vue';

const routes = [
  {
    path: '/',
    name: 'Home',
    component: Home
  },
  {
    path: '/about',
    name: 'About',
    component: About
  }
];

const router = createRouter({
  history: createWebHistory(),
  routes
});

export default router;

import { createApp } from 'vue'
import App from './App.vue'
import router from './router/index.js'

const app = createApp(App)
app.use(router)
app.mount("#app")

mkdir src/views
touch src/views/Home.vue
touch src/views/About.vue

<template>
  <div>
    <h1>Home</h1>
    <p>Welcome to the home page!</p>
  </div>
</template>

<template>
  <div>
    <h1>About</h1>
    <p>This is the about page.</p>
  </div>
</template>

<template>
  <div>
    <router-view></router-view>
    <li><router-link to="/">Home</router-link></li>
    <li><router-link to="/about">About</router-link></li>
  </div>
</template>

npm run serve