vue为什么渲染出错？代码如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script type="text/javascript" src="../js/vue.js">
        </script>
</head>


<body>
<div id="app">
{{message}}
</div>

<script type="text/javascript">
    var app=new Vue({
        el: "#app",
        data:(
            message="hello vue"
        )
    });

</script>
</body>
</html>

图片说明

        data:{
            message:"hello vue"
        }

你应该看看new Vue里怎么来写data的