jQuery - 切换 CSS 背景图像展开/关闭

Question

我正在寻找一种方法来更改切换时的背景图像，就像这里的问题一样:

jQuery - Toggle Image Expand/Close

我的问题是我有这个 html:

<button id="close-menu"></button>
<div id="menu-bar">
<div class="wrapper">
    <a href="http://www.website.com" target="_blank">
        <img src="image.png" alt="">
    </a>
    <div class="options">
        <h2>eBlast Tools</h2>
        <ul>
            <li class="toggle-images">Images are <span>enabled</span>. Click to disable.</li>
            <li class="download-zip"><a href="download.zip">Download ZIP File</a></li>
        </ul>
    </div>
</div>
</div>

这是我当前的 jquery:

$('#close-menu').click(function() {
    $('#menu-bar').slideToggle(400);
    return false;
});

这是CSS:

#close-menu {
background: url(../img/minus-button.png);
background-position: top left;
width: 25px;
height: 25px;
position: absolute;
top: 10px;
right: 20px;
z-index: 100;
border: none;
}

#close-menu:hover {
background: url(../img/minus-button.png);
background-position: bottom left;
}

Answer 1

假设您想要更改close-menu 的背景 - 尝试这样的操作:

$('#close-menu').click(function() {
    $('#menu-bar').slideToggle(400, function(){
        if($(this).is(':visible')){
            $('#close-menu').css('background-position','bottom left');
        } else {
            $('#close-menu').css('background-position','top left');
        }
    });

    return false;
});

---

回应您的评论 - 您最好创建一些这样的 css:

.minus { background: url(../img/minus-button.png) top left no-repeat; }
.minus:hover { background-position: bottom left; }

.plus { background: url(../img/plus-button.png) top left no-repeat; }
.plus:hover { background-position: bottom left; }

将 minus 的类添加到 close-menu 然后做:

$('#close-menu').click(function() {
    $('#menu-bar').slideToggle(400, function(){
        $('#close-menu').toggleClass('minus');
        $('#close-menu').toggleClass('plus');
    });

    return false;
});