jQuery手风琴不能在IE 9中工作？

Question

Why doesn't this work in IE 9? jsfiddle it refuses to open on click, it works fine on all browsers except IE9 > I just can't seem to figure out why! any help is much appriciated.

/* Accordions */
$(".acc_item").click(function(){

    $(this).siblings().children(".accordion_content").not($(this).find(".accordion_content")).slideUp(600,'easeInOutExpo');
    $(this).siblings().children(".accordion").not($(this).find(".accordion")).removeClass("active_acc");

    $(this).find(".accordion").next(".accordion_content").slideToggle(600,'easeInOutExpo');

    if($(this).find(".accordion").hasClass('active_acc')){
        $(this).find(".accordion").removeClass("active_acc");
    }else{
        $(this).find(".accordion").addClass("active_acc");
    }
});

// Open First item if accordion whenever set so
setTimeout(function(){$(".acc_is_open").delay(1500).click();},600); 
/* Accordions::END */

Answer 1

Try this: Demo

$(".acc_item").click(function () {
    $(this).siblings().children(".accordion_content").slideUp(600, 'easeInOutExpo');
    $(this).siblings().children(".accordion").removeClass("active_acc");

    $(this).find(".accordion_content").slideToggle(600, 'easeInOutExpo');

    if ($(this).find(".accordion").hasClass('active_acc')) {
        $(this).find(".accordion").removeClass("active_acc");
    } else {
        $(this).find(".accordion").addClass("active_acc");
    }
});

setTimeout(function () {
    $(".acc_is_open").delay(1500).click();
}, 600);

Answer 2

Try:

$(this).find(".accordion_content").slideToggle(600,'easeInOutExpo');

Also notice that I have included the easing plugin.

Fiddle here