Vue 筑基突破

记事本

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>notepad</title>
    <script src="vue.global.min.js"></script>
</head>
<body>
    <div id="app">
        <!-- 定义一个文本框 -->
        <input type="text" v-model="data.content">
        <!-- 添加按钮 -->
        <!-- 调用data对象的list属性,使用数组的push方法,content是双向绑定 -->
        <button @click="data.list.push(data.content)">添加</button>
        <!-- 直接把数组定义为空数组,就可以达到清空的效果 -->
        <button @click="data.list = []">清空</button>

        <ul>
            <!-- 循环输出数组内容,并返回下表 -->
            <li v-for="(value,index) in data.list">
                <!-- splice方法接受两个参数,第一个是下表,第二个是删除个数 -->
                {{value}} <button @click="data.list.splice(index,1)">删除</button>
            </li>
        </ul>
        <hr>
        <!-- 打印数组长度 -->
        {{ data.list.length }}
    </div>

    <script>
        const { createApp,reactive } = Vue
        const app = createApp({
            setup() {
                // 定义一个data对象
                const data = reactive({
                    content:"icewolf-li.top",
                    list: ['不讲道李','苹果']
                })

                return {
                    data
                }
            }
        }).mount('#app')
    </script>
</body>
</html>

图片轮播

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>图片轮播</title>
    <script src="vue.global.min.js"></script>
</head>
<body>
    <div id="app">
        <input type="text" v-model="num">
        <br>

        <img :src="`img/${num}.jpg`" style="width: 200px;">
        <hr>
        <button @click="prev">上一张</button>
        <button @click="next">下一张</button>

        <ul>
            <li v-for="value in 4">
                <a href="#" @click="jump(value)">{{value}}</a>
            </li>
        </ul>
    </div>

    <script>
        const { createApp,ref,reactive } = Vue;

        createApp({
            setup() {
                const num = ref(1)

                function next() {
                   num.value++
                    if(num.value > 4) {
                        num.value = 1
                    } 
                }

                const prev = () => {
                    num.value--
                    if(num.value < 1) {
                        num.value = 4
                    }
                }

                const jump = (value) => {
                    num.value = value
                }

                return {
                    num,
                    next,
                    prev,
                    jump
                }
            }
        }).mount('#app')
    </script>
</body>
</html>