How does Jquery determine whether a certain tag ID exists?

How jquery determines whether a certain tag ID exists: Use the length attribute of the jQuery object to determine. If [>0] exists, the code is [if($("#id")[0] ){} else {}].

The operating environment of this tutorial: Windows 7 system, jquery version 3.2.1. This method is suitable for all brands of computers.

Jquery method to determine whether a certain tag ID exists:

In the project, I encountered the need to determine whether a certain div element has the id attribute

Use the length property of the jQuery object to determine if >0 exists.

or

if($("#id")[0]){} else {}

or native js

if(document.getElementByIdx_x_xx_x("id")){} else {}

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