CSS 图像预加载

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#preloadedImages {
    width: 0px;
    height: 0px;
    display: inline;
    background-image: url(path/to/image1.png);
    background-image: url(path/to/image2.png);
    background-image: url(path/to/image3.png);
    background-image: url(path/to/image4.png);
    background-image: url();
}