jquery - selector exclusive css in particular situation -

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i using : 

$(".header.nav.nav-user").click(function(){});

but when change css ".header .nav .disable .nav-user", not want trigger click event.

but in situation, $(".header.nav.nav-user") getting triggered when css changed ".header .nav .disable .nav-user".

how can exclude situation?

i have tried :

$(".header.nav.nav-user :not(.disable)")

and 

$(".header.nav.nav-user").not(".disable"),

but both times failed desired result.

please tell me ways this.

appreciate help! thanks.

update: situation is:(i want trigger click event)

<div class="header">   <div class="nav">       <dt class="nav-user">        </dt>    </div> </div>

and is:(i don't want trigger click event)

 <div class="header">   <div class="nav">    <dl class="disable">       <dt class="nav-user">        </dt>     </dl>    </div> </div>

and change use other javascript,not change code.

try this

$(".header.nav.nav-user").not(":disable")

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