Simple example:
1. Download clipboard.min.js and reference it in the page
<script type="text/javascript" src="script/clipboard.min.js"></script>
2. Write the instantiation statement in the script:
<script type="text/javascript">
$(document).ready(function(){
var clipboard = new Clipboard('.btn');
}
</script>
3. Write a page button to realize clicking the button to copy the specified content