Use Jquery to implement multi-level drop-down box without refresh linkage_jquery

At first, I planned to use AJAX, which is only provided by .NET, to implement it, but found that the desired effect could not be achieved. Later, the AJAX function in JQuery was adopted and implemented by asynchronously calling the web service written in C#. The

load() method can be said to be the simplest AJAX method in JQuery. It is used to obtain the response of the target server and display the results on the page. The load method is Jquery's packaging of AJAX. You can also use $.post() and $.get() to implement post or get AJAX calls. For complex situations, you can also use the AJAX() method.