jQuery 实现图片的依次加载图片功能

css代码: ul#portfolio{margin:0;padding:0;} ul#portfolio li{float: left;margin:0 5px 0 0;width:250px;height: 250px;list-style: none;} ul#portfolio li.loading{background: url(../images/spinner.gif) no-repeat center center;} ul#portfolio li img{width:250px;height: 250px;display: block;} js代码: $(functio