input 관련 event 들

focus, blur

$("input").focus(function(){
    $("input").css("background-color","#ff00ff");
});
 
$("input").blur(function(){
    $("input").css("background-color","#0000cd");
});

focusin, focusout

$("div").focusin(function(){
   $(this).css("background-color","#ff00ff");
});
 
$("div").focusout(function(){
   $(this).css("background-color","#0000cd");
}); 

keypress, keydown, keyup

$("input").keydown(function(){
   $("input").css("background-color","#ff00ff");
});
 
$("input").keyup(function(){
   $("input").css("background-color","#0000cd");
});

자주써먹기는 하지만 붕어머리라서 잘 잊어먹는....-_-;;