Write simple example, under the understanding of basic grammar
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8 ">
<style>
</style>
</head>
<body>
<div id="app">
{{message}}
</div>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
var vm = new Vue({
el: '#app',
data: {
message: "Hello Vue !"
},
});
</script>
</body>
</html>In the above code inside, where js script creates a Vue objects, which el-top this option Vue object management element id
In app element, a {{message}}mode reference variable value defined in vue instance in the attribute data, and displayed