[Vue] 4.组件的概念+todoList代码拆分_vuetodolist组件拆分-优快云博客

本文链接：https://blog.youkuaiyun.com/u014627255/article/details/124946882

一、组件的概念

标签中属性和数据绑定：v-bind

<button v-on:click="handleAdditem" v-bind:title="inputValue">增加</button>

在这里插入图片描述
二、拆分todoList组件

将列表拆出来
1）定义一个变量app，将createApp的实例赋值给它

const app = Vue.createApp({
            data() {
                return {
                    inputValue: '',
                    list: []
                }
            },
            methods: {
                handleAdditem() {
                    this.list.push(this.inputValue)
                    this.inputValue = ''
                }
            },
            template: `
            <div>
                <input v-model="inputValue"/>
                <button v-on:click="handleAdditem" v-bind:title="inputValue">增加</button>
                <ul>
                <li v-for="(item, index) of list">{{item}}-{{index}}</li>
                </ul>
            </div>
            `
        }).mount('#root')

2）用app注册组件,名叫todo-item:

app.component('todo-item', {
            data() {
                return {
                    item: 'hello'
                }
            },
            template: '<div>{{item}}</div>'
        })

3）改写原template中列表的展示，改为展示组件todo-item

 template: `
            <div>
                <input v-model="inputValue"/>
                <button v-on:click="handleAdditem" v-bind:title="inputValue">增加</button>
                <ul>
                <todo-item v-for="(item, index) of list" />
                </ul>
            </div>
            `

4)将app挂载到root上，将原来的挂载去掉

app.mount('#root')

5）想显示list循环出来的数据，可用v-bind绑定属性去展示：

<ul>
           <todo-item v-for="item of list" v-bind:content="item"/>
</ul>

接着在组件中用props属性去接收

app.component('todo-item', {
            props: ['content'],
            template: '<li>{{content}}</li>'
        })

完整代码如下

<!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>4s</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>
<body>
    <div id="root"></div>
    <script>
        const app = Vue.createApp({
            data() {
                return {
                    inputValue: '',
                    list: []
                }
            },
            methods: {
                handleAdditem() {
                    this.list.push(this.inputValue)
                    this.inputValue = ''
                }
            },
            template: `
            <div>
                <input v-model="inputValue"/>
                <button v-on:click="handleAdditem" v-bind:title="inputValue">增加</button>
                <ul>
                <todo-item v-for="item of list" v-bind:content="item"/>
                </ul>
            </div>
            `
        });

        app.component('todo-item', {
            props: ['content'],
            template: '<li>{{content}}</li>'
        })
        app.mount('#root')
    </script> 
</body>
</html>