Use the extension function provided by the JQuery library to implement the custom method _ jquery

You can use the extension function provided by the JQuery library without any library to meet all requirements. The following is an example. You can see that the JQuery package provides a large number of methods, it can be used directly on the page. However, none of the libraries can meet all requirements. Therefore, the JQuery Library provides a wide range of extension functions. Take disabling a group of form elements as an example to see how to simply and effectively add custom function extensions to the JQuery library. (JQuery has no way to disable form elements)

Code:

   Custom Method!