Example output
To use Vue.js 3.0 in a demo project with a button that changes the background color, you need to follow these steps:
1. Set up the project:
First, you need to set up a new Vue.js 3.0 project. You can either use the Vue CLI or set up a basic HTML file with the Vue.js script included. For simplicity, let's create a basic HTML file:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Vue.js 3.0 Background Color Changer</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
<!-- Your Vue.js code will be placed here -->
</div>
<script>
// Your Vue.js JavaScript code will be placed here
</script>
</body>
</html>
```
2. Add the button and a data property for storing the background color:
Inside the `div` with the `id` of `app`, add a button and a data property called `backgroundColor`.
...