jq 组装数组,拼接jQuery元素数组

I'm trying to remove elements from a jQuery object using splice().

But, what ends up happening is every other item is removed.

I'm assuming this is due to a re-index of using splice.

I was to fade in each

so I need to start at the top.

Is there a way to accomplish this, or perhaps a better way than what I'm doing here?

• item 1
• item 1
• item 1
• item 1
• item 1
• item 1
• item 1

var $modules = $('.module');

$modules.each(function(i, el) {

var $el = $modules.eq(i);

$modules.splice(i, 1);

$el.addClass("fadein").removeClass('module');

});

console.log($modules);

You'll notice in the console, every other item is still in the array.

解决方案

This code should work:

var $modules = $('.module');

$modules.each(function(i) {

var $el = $modules.eq(0);

$modules.splice(0, 1);

$el.addClass("fadein").removeClass('module');

});

EXPLAINATION

When you use each method, jQuery call your callback for each element, passing i as an index of current element.

So let's say you have an array: [elem1, elem2, elem3, elem4].

On the first step i equals 0. So by writing $el = $modules.eq(i); you get the first element, as expected. then you remove it form array, and now it looks like that: [elem2, elem3, elem4].

On the second step i equals 1, which means second element of your array, that is elem3 actually.

As you can see you jumped over elem2. Thats why some elements remain in an array.

To avoid this behavior you have to use zero index: var $el = $modules.eq(0); and $modules.splice(0, 1);

This is a demo