setInterval is a very useful js function that can be used to repeatedly perform certain functions. Using this we can implement some very interesting functions, such as:
Without refreshing the page, you can get greetings from other members in "real time" and display them as pop-ups
Here is a sample code: (some jquery methods are used in it)
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
