【Vue3 从入门到实战进阶式掌握完整知识体系】033-Composition API：使用 Composition API 开发TodoList

訾博ZiBo

发布于 2025-01-06 14:19:05

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代码可运行

文章被收录于专栏：全栈开发工程师全栈开发工程师

运行总次数：0

代码可运行

4、使用 Composition API 开发TodoList

实现简单的添加列表

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>了解循环</title>
  <!-- 引入Vue库 -->
  <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
  <div id="root"></div>
</body>

<script>
  const app = Vue.createApp({
    setup(){
      const { ref, reactive } = Vue;
      const inputValue = ref('大哥刘备');
      const list = reactive([]);
      const handleClick = () => {
        list.push(inputValue.value);
      }
      return {
        inputValue,
        list,
        handleClick
      }
    },
    template: `
    <div>
      <div>
        <input v-model="inputValue" />
        <button @click="handleClick">添加</button>
      </div>
      <ul>
        <li v-for="(item, index) in list" :key="item">{{item}} -- {{index}}</li>
      </ul>
    </div>`
  });
  
  const vm = app.mount('#root');
</script>

</html>

运行结果

封装优化

代码全写在 setup 里面非常臃肿，且可读性差，不易维护

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>了解循环</title>
  <!-- 引入Vue库 -->
  <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
  <div id="root"></div>
</body>

<script>

  // 封装处理 list 的方法
  const handleList = () => {
    const { reactive } = Vue;
    const list = reactive([]);
    const addItem = (item) => {
      list.push(item);
    }
    return{ list, addItem }
  }

  // 封装处理 inputValue 的方法
  const handleInputValue = () => {
    const { ref } = Vue;
    const inputValue = ref('大哥刘备');
    return{ inputValue }
  }

  const app = Vue.createApp({
    setup(){
      const { list, addItem} = handleList();
      const { inputValue } = handleInputValue();

      return {
        list, addItem, inputValue
      }
    },
    template: `
    <div>
      <div>
        <input v-model="inputValue" />
        <button @click="() => addItem(inputValue)">添加</button>
      </div>
      <ul>
        <li v-for="(item, index) in list" :key="item">{{item}} -- {{index}}</li>
      </ul>
    </div>`
  });
  
  const vm = app.mount('#root');
</script>

</html>