javascript - Finding an item without ID -

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i've got set of divs different classes. there 40 divs 4 classes set randomly. need jquery script makes "background-color: white" on every grid-item click. tried this:

$('.grid-item').click(function(){ $(this).css("background-color", "white"); })

but wasn't idea guess.. ..because didn't work!

can me out, please? 

$('body').on('click', 'div', function(e){    $(this).css("background-color","white"); });

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