这个怎么不能正确渲染vue中的message

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>test</title>
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
    </script>
    <script>
        var app = new Vue({
                el: '#app',
                data: {
                    message: 'Hello Vue!'
                }
            });
    </script>
</head>
<body>
    <div id="app">
        {{ message }}
    </div>
</body>
</html>

vue.js

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