This time I will bring you a summary of the cases of using JSONP. What are the precautions for using JSONP? The following is a practical case, let's take a look.
Both json and JSONP are still very common in development. We will not talk about JSON here.
A well-known problem, Ajax direct request for ordinary files has the problem of cross-domain unauthorized access, regardless of whether you are static pages, dynamic web pages, web services, WCF, as long as it is cross-domain Requests are never allowed, which is why JSONP is used (because when calling js files on a Web page, it is not affected by whether it is cross-domain) (not only that, we also found that all files with the attribute## of "src" # tags all have cross-domain capabilities, such as
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
