Vue3 と Vue2 の違い: より高速なビルド ツール チェーン

export default {
  data() {
    return {
      message: 'Hello, Vue2!'
    }
  },
  methods: {
    handleClick() {
      this.message = 'Vue2 is awesome!'
    }
  }
}

import { ref } from 'vue'

export default {
  setup() {
    const message = ref('Hello, Vue3!')

    const handleClick = () => {
      message.value = 'Vue3 is awesome!'
    }

    return {
      message,
      handleClick
    }
  }
}

<div>
  <h1>{{ title }}</h1>
  <ul>
    <li v-for="item in list" :key="item.id">{{ item.name }}</li>
  </ul>
</div>

<template>
  <div>
    <h1>{{ title }}</h1>
    <ul>
      <li v-for="item in list" :key="item.id">{{ item.name }}</li>
    </ul>
  </div>
</template>

<script setup>
import { ref } from 'vue'

const title = ref('Vue3 Demo')
const list = ref([
  { id: 1, name: 'Apple' },
  { id: 2, name: 'Banana' },
  { id: 3, name: 'Orange' }
])
</script>

<template>
  <div>
    <h1>{{ title }}</h1>
  </div>
</template>

<script lang="ts">
import Vue from 'vue'

export default Vue.extend({
  data() {
    return {
      title: 'Vue2 with TypeScript'
    }
  }
})
</script>

<template>
  <div>
    <h1>{{ title }}</h1>
  </div>
</template>

<script setup lang="ts">
import { ref } from 'vue'

const title = ref('Vue3 with TypeScript')
</script>