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The .jquery property is assigned via the jQuery prototype and is referenced by using its alias $.fn . It is a string containing the jQuery version number, such as "1.5.0" or "1.4.4".

The main purpose of this method is to provide plugin developers with the ability to override this method and display errors in a better way, or to provide more information.

In jQuery 1.3, if the argument passed is a function, then using .param() will get the return value of the function instead of returning the function as a string.

In jQuery 1.3, if the argument passed is a function, then using .param() will get the return value of the function instead of returning the function as a string.

Remove the spaces at the beginning and end of the string.

Determine if its argument is a number.The $.isNumeric() method checks if its argument represents a numeric value. If so, it returns true.

Tests if the object is a window (possibly a Frame).

It will check whether the object is a purely object (created by "{}" or "new object").

It will check if the object is an empty object (without any attributes).

Test if the object is a function.After jQuery 1.3, in IE browser, browser-provided functions such as 'alert' and methods of DOM elements such as 'getAttribute' will not be considered as functions.