Ajax authentication username

The ajax authentication Username. Today we will talk about the method for verifying the username through ajax again. I have written code many times before. Now I am only talking about ideas and not writing code, if you want to find the code, please search this site. there are php + ajax user detection and asp + ajax user name detection, so I don't want to repeat the code. I just want to talk about the ideas,

The advantage of ajax is to improve the user experience. I think we all know this, or we will not use any ajax to check whether the user name exists,

Well, let's talk about the idea. First, the user enters the registration name, such as loveyou. When the text box loses the focus, I send the data to the php or asp file we wrote using ajax, then judge the status. If the status is not sent successfully and the returned result is returned, we will use dom to replace the innerhtml content of our prepared div and submit it to the user, select or clear the file box.

All right.