1: Just a reminder, no changes can be made to the script;
2: Generally used for confirmation, returning true or false, so it can be easily used for if...else... judgment
3: An input The dialog box can return the string filled in by the user, which is commonly seen in some guestbooks or forums where UBB format images are inserted into the input content
Let’s demonstrate below:
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
