How should I write this code? About calling js_html/css_WEB-ITnose

If the content of xxx.js is

document.writeln("<iframe src=\"http://www.xxx.com\" ></iframe>");

, the call in HTML is usually

<script src="/xxx.js" type="text/javascript"></script>

How to use

<p id="xxx"></p>

or

<div id="xxx"></div>

Or other methods, in short, don’t use <script src="/xxx.js" type="text/javascript"></script>.

Reply to discussion (solution)

I don’t understand what you mean

Reference: load scripts asynchronously
Use the above page A certain method is then triggered in a certain event of p or div, such as click

I’m confused, what are you doing?
Anyway, you want to reference the .js file in your page You have to use <script> to import it. Your <p id="xxx"> is an id. What does it have to do with the referenced .js file?
If you want to import <p id="xxx" "> To perform any operation, you have to add corresponding events to <p> and call js functions.