如何使用jQuery .css获得此if语句？

Question

In my jQuery code (I know the if statement isn't jQuery), the CSS property "right" for the class "slider" does NOT equal 30, yet "container" is still fading out on mousedown.. What am I doing wrong?

I want it to be: if the class of slider has a "right" CSS property equal to 30 pixels, then fadeout the container.

$(document).ready(function() {
    $(".slider").mousedown(function() {
        if ($('.slider')
            .css({'right':30})
        ) {
        $('.container')
            .fadeOut('slow');
        }
    });
});

Answer 1

$('.slider').css({'right':30}) returns an array object which always evaluates to true.

You want if ($('.slider').css('right') == "30px") ...

Answer 2

Maybe:

if($('.slider').css('right') == '30'){ ... }

There might be a unit, like px at the end of the value there. Not sure.

Answer 3

$(document).ready(function() {
    $(".slider").mousedown(function() {
        if ($('.slider').css('right') == 30) {
            $('.container').fadeOut('slow');
        }       
    });
});