How to declare and call custom functions in jquery

jQuery is a powerful JavaScript library that can help developers process web content and behavior. When using jQuery, we often need custom functions to achieve specific functions. The method of calling a custom function is as follows:

1. Define a custom function

First, you need to define a custom function in a JavaScript file or page. Here is an example:

function myFunction() {
    // do something
}

2. Add the custom function to the jQuery object

Next, add the custom function to the jQuery object. You can use the following method:

$.extend({
    myFunction: function() {
        // do something
    }
});

Or use the following syntax:

$.fn.myFunction = function() {
    // do something
};

Both methods add the custom function to the jQuery object so that it can be called through the jQuery object.

3. Call the custom function

Now that we have added the custom function to the jQuery object, we can call it using the following methods:

$.myFunction();

or

$('selector').myFunction();

Among them, $('selector') is the jQuery object, and myFunction is the custom function on the object. If we need to pass parameters to a custom function, we can do it like this:

$.myFunction(param1, param2);

or

$('selector').myFunction(param1, param2);

The above is how jQuery calls a custom function. I hope it can help you understand the usage of jQuery custom functions.

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