Vue 初识Hello word

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello word</title>
    <script type="text/javascript" src="../assets/js/vue.js"></script>
</head>
<body>
    <h1>Hello Word</h1>
    <hr>
     <div id="app">{{message}}</div>
</body>
</html>
<script>
    var app = new Vue({
        el:'#app',
        data:{
            message:'hell word'
        }
    })
</script>