如何在 JavaScript 图像滑块中居中对齐图像

Question

我用 JavaScript 创建了一个幻灯片放映，框架的分辨率设置为 960x540，但是当我将图像插入滑块时，它会自动向左对齐，如何将滑块内的图像对齐到中心，并且是即使图像不完全是滑块的分辨率，有任何方法可以自动对齐图像。这是我使用的基本代码。

 <style type="text/css">

#sliderFrame {position:relative;width:960px;margin: 0 auto 40px;}

#slider {
    width:960px;height:540px;/* Make it the same size as your images */
 background:#fff url(http://4.bp.blogspot.com/-aVGCcclfKQo/UR-T3vxFAMI/AAAAAAAABm8/ncwIfUdoLIw/s1600/loading.gif) no-repeat 50% 50%;
 position:relative;
 margin:0 auto;/*make the image slider center-aligned */
    box-shadow: 0px 1px 5px #999999;
}
#slider img {
 position:absolute;
 border:none;
 display:none;
}

/* the link style (if an image is wrapped in a link) */
#slider a.imgLink {
 z-index:2;
 display:none;position:absolute;
 top:0px;left:0px;border:0;padding:0;margin:0;
 width:100%;height:100%;
}

/* Caption styles */
div.mc-caption-bg, div.mc-caption-bg2 {
 position:absolute;
 width:100%;
 height:auto;
 padding:0;
 left:0px; 
 bottom:15px;
 z-index:3;
 overflow:hidden;
 font-size: 0;
}
div.mc-caption-bg {
 background-color:black;
}
div.mc-caption {
 font: bold 14px/20px Arial;
 color:#EEE;
 z-index:4;
 padding:10px 0;
 text-align:center;
}
div.mc-caption a {
 color:#FB0;
}
div.mc-caption a:hover {
 color:#DA0;
}


/* ------ built-in navigation bullets wrapper ------*/
div.navBulletsWrapper  {
 top:500px; left:280px; /* Its position is relative to the #slider */
 width:150px;
 background:none;
 padding-left:20px;
 position:relative;
 z-index:5;
 cursor:pointer;
}

/* each bullet */
div.navBulletsWrapper div 
{
    width:11px; height:11px;
    background:transparent url(http://3.bp.blogspot.com/-ZUaX5-lcCi4/UR-TzMXcpuI/AAAAAAAABm0/kokxtfFdNcU/s1600/bullet.png) no-repeat 0 0;
    float:left;overflow:hidden;vertical-align:middle;cursor:pointer;
    margin-right:11px;/* distance between each bullet*/
    _position:relative;/*IE6 hack*/
}
div.navBulletsWrapper div.active {background-position:0 -11px;}
.intro {
    bottom: 0;
    color: rgba(0, 0, 0, 0.2);
    font-size: 16px;
    position: absolute;
    right: 0;
    text-decoration: none;
    z-index: 99999;
}
/* --------- Others ------- */
#slider 
{
 transform: translate3d(0,0,0);
    -ms-transform:translate3d(0,0,0);
    -moz-transform:translate3d(0,0,0);
    -o-transform:translate3d(0,0,0);
}
</style>
<script src="http://project.dimpost.com/image-slider/js-image-slider-1.js" type="text/javascript"></script>
<script src="http://project.dimpost.com/image-slider/js-image-slider-2.js" type="text/javascript"></script>

Answer 1

据我了解，您可以添加

left: 50%;

使用“#slider img”选择器添加到您的 CSS 规则中，并添加一些 JavaScript 以将负边距设置为等于图像宽度一半的图像，例如（使用 jQuery）：

$("#slider img").each(function () {
    $(this).css("margin-left", -this.width / 2);
})