hands on vue - component의 global, local 이해(연습예제 고민하고 풀기!)

[목표]

1. component를 모두 global로 했을 경우 한번밖에 안쓰는 녀석들도 

계속해서 불러오는 현상이 생길 수 있다.

이러한 현상은 메모리를 차지해 느리게 한다. 

 

따라서 local에서만 사용하는 것이 무엇인지 판단하고 

global, local 컴포넌트를 나누어보자

 

직접 판단하쇼

최소 20분은 고민하쇼

 

---

[수정전 - App.vue]

<template>
  <div>
    <the-header></the-header>
    <badge-list></badge-list>
    <user-info
      :full-name="activeUser.name"
      :info-text="activeUser.description"
      :role="activeUser.role"
    ></user-info>
  </div>
</template>

<script>
export default {
  data() {
    return {
      activeUser: {
        name: 'Maximilian Schwarzmüller',
        description: 'Site owner and admin',
        role: 'admin',
      },
    };
  },
};
</script>

<style>
html {
  font-family: sans-serif;
}

body {
  margin: 0;
}
</style>

[수정전 -BadgeList.vue]

<template>
  <section>
    <h2>Available Badges</h2>
    <ul>
      <li>
        <base-badge type="admin" caption="ADMIN"></base-badge>
      </li>
      <li>
        <base-badge type="author" caption="AUTHOR"></base-badge>
      </li>
    </ul>
  </section>
</template>

<style>
section h2 {
  margin: 0.5rem 0;
  color: #3a3a3a;
}
ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
}

li {
  margin-right: 1rem;
}
</style>

[수정전 - BaseBadge.vue]

<template>
  <span class="badge" :class="classes">{{ caption }}</span>
</template>

<script>
export default {
  props: ['type', 'caption'],
  computed: {
    classes() {
      return {
        'badge--admin': this.type === 'admin',
        'badge--author': this.type === 'author',
      };
    },
  },
};
</script>

<style>
.badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 30px;
  background-color: #ccc;
  color: #2e2e2e;
}

.badge--admin {
  background-color: #810036;
  color: white;
}

.badge--author {
  background-color: #002c8a;
  color: white;
}
</style>

[수정전 - TheHeader.vue]

<template>
  <header>
    <h1>More on Vue Components</h1>
  </header>
</template>

<style>
  header {
    width: 100%;
    height: 5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #14005e;
  }

  header h1 {
    color: white;
    margin: 0;
  }
</style>

[수정전 - UserInfo.vue]

<template>
  <section>
    <div>
      <h3>{{ fullName }}</h3>
      <base-badge :type="role" :caption="role.toUpperCase()"></base-badge>
    </div>
    <p>{{ infoText }}</p>
  </section>
</template>

<script>
export default {
  props: ['fullName', 'infoText', 'role'],
};
</script>

<style>
section {
  margin: 2rem auto;
  max-width: 30rem;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
  padding: 1rem;
}

section div {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
</style>

[수정 전 - main.js]

import { createApp } from 'vue';

import App from './App.vue';
import TheHeader from './components/TheHeader.vue';
import BaseBadge from './components/BaseBadge.vue';
import BadgeList from './components/BadgeList.vue';
import UserInfo from './components/UserInfo.vue';

const app = createApp(App);

app.component('the-header', TheHeader);
app.component('base-badge', BaseBadge);
app.component('badge-list', BadgeList);
app.component('user-info', UserInfo);

app.mount('#app');

---

[수정 후 - App.vue]

<template>
  <div>
    <the-header></the-header>
    <badge-list></badge-list>
    <user-info
      :full-name="activeUser.name"
      :info-text="activeUser.description"
      :role="activeUser.role"
    ></user-info>
  </div>
</template>

<script>
import TheHeader from './components/TheHeader.vue';
import UserInfo from './components/UserInfo.vue';
import BadgeList from './components/BadgeList.vue';

export default {
  components: {
    TheHeader: TheHeader, //TheHeader -> the-header 로 vue가 알아서 변경해줌. 라인3번보면 케밥케이스로 되어있는데 잘못된 게 아님!
    UserInfo: UserInfo,
    BadgeList: BadgeList,
  },
  data() {
    return {
      activeUser: {
        name: 'Maximilian Schwarzmüller',
        description: 'Site owner and admin',
        role: 'admin',
      },
    };
  },
};
</script>

<style>
html {
  font-family: sans-serif;
}

body {
  margin: 0;
}
</style>

[수정후 - BadgeList.vue]

<template>
  <section>
    <h2>Available Badges</h2>
    <ul>
      <li>
        <base-badge type="admin" caption="ADMIN"></base-badge>
      </li>
      <li>
        <base-badge type="author" caption="AUTHOR"></base-badge>
      </li>
    </ul>
  </section>
</template>

<style>
section h2 {
  margin: 0.5rem 0;
  color: #3a3a3a;
}
ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
}

li {
  margin-right: 1rem;
}
</style>

[수정후 - BaseBadge.vue]

<template>
  <span class="badge" :class="classes">{{ caption }}</span>
</template>

<script>
export default {
  props: ['type', 'caption'],
  computed: {
    classes() {
      return {
        'badge--admin': this.type === 'admin',
        'badge--author': this.type === 'author',
      };
    },
  },
};
</script>

<style>
.badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 30px;
  background-color: #ccc;
  color: #2e2e2e;
}

.badge--admin {
  background-color: #810036;
  color: white;
}

.badge--author {
  background-color: #002c8a;
  color: white;
}
</style>

[수정후 - TheHeader.vue]

<template>
  <header>
    <h1>More on Vue Components</h1>
  </header>
</template>

<style>
  header {
    width: 100%;
    height: 5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #14005e;
  }

  header h1 {
    color: white;
    margin: 0;
  }
</style>

[수정후 - UserInfo.vue]

<template>
  <section>
    <div>
      <h3>{{ fullName }}</h3>
      <base-badge :type="role" :caption="role.toUpperCase()"></base-badge>
    </div>
    <p>{{ infoText }}</p>
  </section>
</template>

<script>
export default {
  props: ['fullName', 'infoText', 'role'],
};
</script>

<style>
section {
  margin: 2rem auto;
  max-width: 30rem;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
  padding: 1rem;
}

section div {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
</style>

[수정후 - main.js]

import { createApp } from 'vue';

import App from './App.vue';
import BaseBadge from './components/BaseBadge.vue';

const app = createApp(App);

app.component('base-badge', BaseBadge);

app.mount('#app');