为什么显示我的Vue没有定义？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.bg{
color:red;
}
</style>
<script type="text/javascript" src="https://cdn.bootcss.com/vue/2.6.0/vue.min.js"></script>
</head>
<body>
<div id="app">
<div class="bg">
hello world
{{msg}}
</div>
<div class="bg">
{{msg}}
{{count}}
</div>
</div>
<script>
new Vue({
el: '#app',
data: {
msg: 'hello Vue',
count:0,
}
})
</script>
</body>
</html>
