The simplest Ajax application, used to asynchronously verify the user name

Ajax Asynchronous interaction technology is very popular in the production of web pages. Here we will first introduce how to use jQuery to asynchronously verify the user name of Ajax, and then analyze it in depth to create an XMLHttpRequest object using pure JS, complete the content encapsulated at the bottom layer of jQuery. The following demonstrates the jQuery implementation first... syntaxHighlighter.

Ajax Asynchronous interaction technology is very popular in the production of web pages. Here we will first introduce how to use jQuery to asynchronously verify the user name of Ajax,

Next, we will analyze it in depth and use pure JS to create the XMLHttpRequest object to complete the content encapsulated at the bottom layer of jQuery. The following shows the implementation of jQuery.

Very simple.

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