文件后缀 easyui格式
*.3gpp audio/3gpp, video/3gpp
*.css text/css
*.csv text/csv
*.doc application/msword
*.gif image/gif
*.htm text/html
*.html text/html
*.jpeg image/jpeg
*.jpg image/jpeg
*.js text/javascript, application/javascript
*.json application/json
*.mp3 audio/mpeg
*.mp4 audio/mp4, video/mp4
*.pdf application/pdf
*.png image/png
*.ppt application/vnd.ms-powerpoint
*.svf image/vnd.svf
*.txt text/plain
*.xhtml application/xhtml+xml
*.xls application/vnd.ms-excel
*.xml text/xml, application/xml
*.zip aplication/zip