Example of setting the input disabled attribute in jquery

How to set the disabled attribute to true, that is, the state is unavailable, which is implemented by js, jquery, and html respectively.

Example:
 

The code is as follows:	Copy code
// JS Document. getElementByIdx ("btn"). disabled = true; // Jquery $ ("# Btn"). attr ("disabled", true ); // Html <Input type = "button" value = "submit" id = "btn">

There are two ways to set the disabled attribute and cancel the disabled attribute for the element:
 

The code is as follows:	Copy code
$ ('Input'). attr ("disabled", true) // Set the input element to disabled $ ('Input'). attr ("disabled", false) // remove the disabled attribute of the input element $ ('Input'). attr ("disabled", "disabled") // Set the input element to disabled $ ('Input'). attr ("disabled", "") // remove the disabled attribute of the input element