收藏，jquery file upload不错的插件
http://blueimp.github.com/jQuery-File-Upload/
File Upload widget with multiple file selection, drag&drop support, progress bars and preview images for jQuery.
Supports cross-domain, chunked and resumable file uploads and client-side image resizing.
Works with any server-side platform (PHP, Python, Ruby on Rails, Java, Node.js, Go etc.) that supports standard HTML form file uploads.
还支持HTML 5浏览器下的拖拉上传