jQuery的背景只改变一个轴 [英] jquery background change one axis only

问题描述

我认为我的最后一个问题使每个人不知所措，所以我将简化

I think my last question overwhelmed everybody so I will simplify

我仅尝试更改x轴的背景位置.默认情况下，如果仅定义一个值，则另一个默认为50%，因此此功能:

I am attempting to change the background-position of the x-axis only. By default if only one value is defined, the other defaults to 50%, so this function:

function colorChangePiano() {
    var bp = $("background-position").css;
    $("#target").css('background-position', (bp == -1131) ? '-377' : '0');
}

返回背景位置:0 50%;

如何修改功能以更改x轴但保持y轴不变?

How can I modify the function to change x-axis but leave y-axis unchanged?

已编辑->这是针对具有4列4行的精灵，因此y轴应保持动态.此处的工作网站: http://www.avalonbyeaw.com 单击完成".我们在现场站点上使用了一些疯狂的复杂脚本，但无论如何我还是会把它留在这里，因为我仍然非常想找到解决这个问题的方法

edited --> this is for a sprite with 4 columns and 4 rows so the y-axis should remain dynamic. working site here: http://www.avalonbyeaw.com click "finishes." we got it working with some crazy complicated scripting on the live site, but i will leave this up here anyway because i would still really like to find a solution to this problem

推荐答案

这就是我要这样做的方式.

Here's how I would do it.

$('#target').css('background-position', function(i, backgroundPosition) {
    return backgroundPosition.replace(/\d+px/, '60px');
});

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