刷新页面的Chrome脚本，如果元素存在则通知我

Question

I'm looking to make a chrome script that refreshes multiple pages every minute or so, and if an element on the page exists, I need it to notify me somehow.

I've heard of the Tampermonkey extension for chrome, but I don't know how to continue from here as I'm new to all this.

Thanks.

Answer 1

A simple approach might be to use Selenium with the Chrome webdriver instead of trying to use a in browser script. Its standard library is designed to do exactly what it sounds like you want to do.

Answer 2

I won't write whole script for you, but here's a list of things you need to google:

• Fetching pages's HTML with AJAX - this will save a lot of bandwidth and CPU. You only need page HTML, not all the images and scripts
• Regular expressions - although generally using regular expressions to parse HTML is a BadThing™, for specific case like this it's OK
• Notifications API - you can send desktop notifications using JavaScript. Google it.