Search for a given element from among the matched elements.
Optional
Element to look for.
The index of the element.
$('.pear').index();//=> 2 $('.orange').index('li');//=> 1$('.apple').index($('#fruit, li'));//=> 1 Copy
$('.pear').index();//=> 2 $('.orange').index('li');//=> 1$('.apple').index($('#fruit, li'));//=> 1
https://api.jquery.com/index/
Search for a given element from among the matched elements.