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代码说明：

  兼容性很好的滚动条代码：特点：兼容主流浏览器，滚动效果完全自己订制！绝非网上的大路货。是作者参考多个滚动条解决方案编写而成。(Good compatibility scroll bar code: features: compatible with the mainstream browsers, rolling their own completely custom effects!大路货not online. Is the author of a number of scroll bar reference solution prepared by)