老师，能帮我看看为什么这段代码执行不了

来源：1-5 Teleport 传送门功能

weixin_慕姐4338681

2022-06-06 12:27:48

<!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>传送门</title>
    <style>
        .area {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-50%);
            width: 300px;
            height: 300px;
            background: green;
        }
        .mask {
            position: absolute;
            left: 0;
            right: 0;
            top: 0;
            bottom: 0;
            background: #0000;
            opacity: 0.5;
            color:#fff;
            font-size: 100px;
        }
    </style>
    <script src="../vue@3.2.23.js"></script>
</head>
<body>
    <div id="root"></div>
    <div id="hello"></div>
</body>
<script>
    const app = Vue.createApp({
        data() {
            return {
                show:false,
                message:'hello'
            }
        },
        methods:{
            handleBtnClick() {
                this.show=!this.show
            }
        },
        template:`
            <div class="area">
                <button @click='handleBtnClick'>按钮</button>
                <teleport to='#hello'>
                    <div class='mask' v-show='show'>{{message}}</div>
                </teleport>
            </div>
        `
    })
    const vm = app.mount('#root');
</script>
</html>

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