Nodejs-php application port 80, using node. js to implement real-time push through Port 8888, how to solve the cross-origin problem?

The project background is a php application. To add the instant push function, port 8888 is written in node. js to push instant messages and socket. io is used for data transmission. How can I establish a socket connection between Port 80 and port 8888 on the application page? Node jsphp cross-origin socket iosocket

The project background is a php application.
To add the instant push function, port 8888 is written in node. js to push instant messages and socket. io is used for data transmission.

How can I establish a socket connection between Port 80 and port 8888 on the application page?