Jqueryu problem Mouse move in and out remove default style Toggle style

$(".case-icon li").hover(function(){                
//    $(this).children(".xianshi").eq(0).removeClass("yincang");
//    $(this).children(".aa").eq(0).addClass("yincang");

    $(this).children(".yincang").removeClass("yincang");
    $(this).children(".xianshi").addClass("yincang");
},function(){
//    $(this).children(".yincang").eq(0).removeClass("yincang");
//    $(this).children(".xianshi").eq(0).addClass("yincang");
                
    $(this).children(".aa").addClass("yincang");
    $(this).children(".xianshi").removeClass("yincang");
});

I would like to ask, how do I get rid of the first default style and let it move the mouse into the picture and change the text into the picture and the other into the picture as its content? Move the mouse out the opposite way.

Jquery
Dec.21,2021 
$('.case-icon li').hover(function(){                
  $(this).children().toggleClass('yincang xianshi');
  $(this).siblings().children()
    .eq(0).addClass('xianshi').removeClass('yincang')
    .next().addClass('yincang').removeClass('xianshi');
});

this logic css is sufficient and does not require js 

.case-icon li a:last-child,
.case-icon li:hover a:first-child{
  display: none;
}
.case-icon li:hover a:last-child{
  display: inline;
}

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