jQuery的背景位置动画 [英] jQuery background-position animation

问题描述

我创建了一个形象基本上是3图像的CSS精灵在一起。它的尺寸为278x123，使他们基本上都是278x41 3张照片。

I've created an image which is basically a CSS sprite of 3 images together. It's size is 278x123 so they are basically 3 images of 278x41.

我所试图做的是改变背景位置，以使一个动画。

What I am trying to do is to make an animation of that by changing the background position.

我试过很多东西，我也不是很努力的解决方案之一是：

I've tried many things, one of my not very working solution is the following:

    var $slogan = $('#header h2 span');
$slogan.css({backgroundPosition: '0px 0px'});
function slogan_animation() {
    if ($slogan.css('background-position') == '0px 0px') {
        $slogan.fadeIn('slow').css('background-position', '0px -41px').fadeOut('slow');
    }
    else if ($slogan.css('background-position') == '0px -41px') {
        $slogan.fadeIn('slow').css('background-position', '0px -82px').fadeOut('slow');
    }
    else if ($slogan.css('background-position') == '0px -82px') {
        $slogan.fadeIn('slow').css('background-position', '0px 0px').fadeOut('slow');
    }
}
setInterval(slogan_animation, 2000);

任何想法我怎么能这样做呢？

Any ideas how could I do that?

基本上我只需要：
- 设置我的背景位置为0像素0像素，再从0像素0像素再次移动到0像素-41px，然后0像素-82px，然后循环它。这将是巨大的也有那些之间淡入（）的效果。

Basically I just need to: - set my background position to "0px 0px", then move it to "0px -41px", then "0px -82px" and then loop it again from "0px 0px". It would be also great to have fadeIn() effect between those.

任何想法？

感谢您。

推荐答案

的背景位置的风格是一种复合式的，所以当你读它，它可能不给您所期望的结果。此外，该结果可能browers之间有所不同。

The background-position style is a composite style, so when you read it, it might not give the result that you expect. Also, the result may differ between browers.

尝试使用一个变量来保持，而不是从款式阅读它的轨道的位置。设置位置你开始褪色前：

Try using a variable to keep track of the position instead of reading it from the style. Set the position before you start the fade in:

$(function(){

  var $slogan = $('#header h2 span');
  var offset = 0;

  window.setInterval(function(){
    $slogan.css('background-position', '0 -'+offset+'px')
    .fadeIn('slow')
    .fadeOut('slow');
    offset = (offset + 41) % 123;
  }, 2000);

});

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