The progress bar image's width is clipped based on the amount of file loading completed, therefore it starts with a zero pixel width and animates to its original width when the loading is complete.
进度条图片的宽度被裁减，基于加载完成的文件数，因此，当加载完成时，从开始的零像素宽度并动画到它的原始宽度。
The progress bar image's width is clipped based on the amount of file loading completed, therefore it starts with a zero pixel width and animates to its original width when the loading is complete.
进度条图片的宽度被裁减，基于加载完成的文件数，因此，当加载完成时，从开始的零像素宽度并动画到它的原始宽度。
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