Java文件上传，以及javascr ipt的一些读秒跳转功能的演示，包括完整的可运行的程序，只要粘贴复制即可在任何Java程序中运行-Java file upload, as well as some javascr ipt countdown demonstration jump features, including full program can run as long as you can paste the copied in any Java program to run

该文档教大家怎么实现文件上传预览的过程 有几种方法-There are several ways the document to teach you how to achieve file upload preview