Vue3的切换小案例

效果：
<!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>Document</title>
    <script src="https://unpkg.com/vue@next"></script>
    <style>
        *{
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html,body{
            font-family: Arial, Helvetica, sans-serif;
        }
        #app{
            width: 400px;
            height: 100vh;
            margin: auto;
            text-align: center;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }
        h1,h3{
            margin-bottom: 1rem;
            font-weight: normal;
        }
        img{
            border-radius: 50%;
            border: 5px #333 solid;
            margin-bottom: 1rem;
        }
        .male {
            border-color: steelblue;
            background-color: steelblue;
        }
        .female{
            border-color: pink;
            background-color: pink;
            color: #333;
        }
        button {
            cursor: pointer;
            display: inline-block;
            background: #333;
            color: white;
            font-size: 18px;
            border: 0;
            padding: 1rem 1.5rem;
        }
        button:focus{
            outline: none;
        }
        button:hover{
            transform: scale(0.98);
        }
    </style>
</head>
<body>
    <div id="app">
        <img v-bind:src="picture" :alt="`${firstName} ${lastName}`" :class="gender">

        <h1>{{firstName}} {{lastName}}</h1>

        <h3>Email: {{email}}</h3>

        <button :class="gender" @click="getUser()">Get Random User</button>
    </div>

    <script>
        const app =Vue.createApp({
            data(){
                return {
                    firstName : 'John',
                    lastName: 'Doe',
                    email: 'john@gmail.com',
                    gender:'male',
                    picture:'https://randomuser.me/api/portraits/men/18.jpg'
                }
            },
            methods:{
                async getUser(){
                    const res =await fetch('https://randomuser.me/api')
                    const {results} = await res.json();
                    console.log(results)

                    
                    this.firstName = results[0].name.first
                    this.lastName  = results[0].name.last
                    this.email = results[0].email
                    this.gender = results[0].gender
                    this.picture = results[0].picture.large
                }
            }
        })


        app.mount("#app")
    </script>
</body>
</html>