You can use the following VueJS cdn to replace the VueJS version in the code:
VueJS Online Editor that allows your VueJS code online without the need of a web server, You don't need to use a text editor to edit VueJS files on your computer.
This way you can quickly and easily see the VueJS running results, With ace editor, any errors or warnings are identified and clear and actionable feedback is provided to help you improve the performance of your code. You can write or paste VueJS code like this:
<html>
<head>
<title>VueJs Online editor</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.0/vue.min.js">
</script>
</head>
<body>
<div id = "intro" style = "text-align:center;">
<h1>{{ message }}</h1>
</div>
<script type = "text/javascript">
var vue_det = new Vue({
el: '#intro',
data: {
message: 'My first VueJS project'
}
});
</script>
</body>
</html>