样式1：只限制图片

样式2：附件,限制只能是doc,rar,zip

样式3：附件不限制

样式4：封面

upload/image/20200422/image20170821231428_4376.jpeg#upload/image/20200422/image20170821231443_7215.jpeg

样式5:压缩成宽为500

upload/image/20200422/image20170821231428_4376.jpeg#upload/image/20200422/image20170821231443_7215.jpeg

样式6：上传到指定的my文件夹来

file/20200422/Date20161102224750SJ7486.png#file/20200422/Date20161102224752SJ4338.jpg