首先我们来了解一下上传文件 <input type="file"> input的file常用上传类型 后缀名 MIME名称 *.3gpp audio/3gpp, video/3gpp *.ac3 audio/ac3 *.asf allpication/vnd.ms-asf *.au audio/basic *.css text/css *.csv text/csv *.doc application/msword *.dot application/msword *.dtd