How does jQuery obtain the Tag Name of the currently specified element?

How does jQuery obtain the Tag Name of the currently specified element?

How to obtain the Tag Name of the currently specified element:
It is not common in actual applications to obtain the tag name. You may never be able to use it. However, here is only a method. If you are interested, you can take a look at it, if you are not interested, just skip it.
The code example is as follows:

 

<Script type = "text/javascript"> $ (document ). ready (function () {alert ($ ("# testInput") [0]. tagName );}) </script>  
 
 
In fact, the above Code is converted into a DOM element in advance, and then the tag name is obtained using the tagName attribute.
 
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