文件上传的类型控制选择：
<input type="file" accept="application/msword" >
accept属性列表：
1.accept="application/msexcel"
2.accept="application/msword"
3.accept="application/pdf"
4.accept="application/poscript"
5.accept="application/rtf"
6.accept="application/x-zip-compressed"
7.accept="audio/basic"
8.accept="audio/x-aiff"
9.accept="audio/x-mpeg"
10.accept="audio/x-pn/realaudio"
11.accept="audio/x-waw"
12.accept="image/gif"
13.accept="image/jpeg"
14.accept="image/tiff"
15.accept="image/x-ms-bmp"
16.accept="image/x-photo-cd"
17.accept="image/x-png"
18.accept="image/x-portablebitmap"
19.accept="image/x-portable-greymap"
20.accept="image/x-portable-pixmap"
21.accept="image/x-rgb"
22.accept="text/html"
23.accept="text/plain"
24.accept="video/quicktime"
25.accept="video/x-mpeg2"
26.accept="video/x-msvideo"
27.accept=".apk" //.apk为需要上传文件的后缀名，需要上传什么格式的文件，控制显示当前的文件后缀就好
28.accept="image/*" //选择所有的图片类型
限制图片上传大小控制示例
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script type="text/javascript"> var isIE = /msie/i.test(navigator.userAgent) && !window.opera; function fileChange(target) { var fileSize = 0; var filemaxsize = 1024*2;//2M if (isIE && !target.files) { var filePath = target.value; var fileSystem = new ActiveXObject("Scripting.FileSystemObject"); var file = fileSystem.GetFile (filePath); fileSize = file.Size; } else { fileSize = target.files[0].size; } var size = fileSize / 1024; if(size>filemaxsize){ alert("图片大小不能超过"+filemaxsize/1024+"M！"); target.value =""; return false; }else if(size<=0){ alert("图片大小不能为0M！"); target.value =""; return false; }else{ alert("上传成功！"); } } </script> </head> <body> <input type="file" onChange="fileChange(this);" accept="image/*"/> </body> </html>