jquery - 反向 JQuery 幻灯片

Question

您好，我正在处理 JQuery 幻灯片。我的 html 中的所有图片都在彼此之上，我试图让我的代码从最后一张图片开始。但它行不通，有什么想法吗？

原始代码如下所示:

$(document).ready(function() {
    var current = $('#gallery img:first');
    //Set the fade in effect for the next image, show class has higher z-index
    current.addClass('show').css({
        opacity: 0.0
    }).animate({
        opacity: 1.0
    }, 1000);

    setInterval('gallery()', 3000);
});

function gallery() {
    //if no IMGs have the show class, grab the first image
    var current = ($('#gallery img.show') ? $('#gallery img.show') : $('#gallery img:first'));

    //Get next image, if it reached the end of the slideshow, rotate it back to the first image
    var next = ((current.next().length) ? current.next() : $('#gallery img:first'));

    //Set the fade in effect for the next image, show class has higher z-index
    next.css({
        opacity: 0.0
    }).addClass('show').animate({
        opacity: 1.0
    }, 1000);

    //Hide the current image
    current.animate({
        opacity: 0.0
    }, 1000).removeClass('show');
}​

我的反向代码是这样的:

$(document).ready(function() {
    var current = $('#gallery img:last');
    //Set the fade in effect for the next image, show class has higher z-index
    current.addClass('show').css({
        opacity: 0.0
    }).animate({
        opacity: 1.0
    }, 1000);

    setInterval('gallery()', 3000);
});

function gallery() {
    //if no IMGs have the show class, grab the first image
    var current = ($('#gallery img.show') ? $('#gallery img.show') : $('#gallery img:last'));

    //Get next image, if it reached the end of the slideshow, rotate it back to the first image
    var before = ((current.before().length) ? current.before() : $('#gallery img:last'));

    //Set the fade in effect for the next image, show class has higher z-index
    before.css({
        opacity: 0.0
    }).addClass('show').animate({
        opacity: 1.0
    }, 1000);

    //Hide the current image
    current.animate({
        opacity: 0.0
    }, 1000).removeClass('show');
}​

Answer 1

在没有测试页的情况下，我在 ul 中添加了图像，这样做了:

var before = ((current.prev().length) ? current.prev() : $('#gallery img:last'));

这将选择要显示的上一张图片，如果没有则再次选择最后一张图片。

如果这对你有用，你能试试吗？