2020-02-16 标签:客户端,限制,上传,jpg,格式,图片,js,代码,实现,如下,function,checkphoto,fnupload,var,filename,value,alert,mime,tolowercase,substr

实现代码如下： function checkPhoto(fnUpload) { var filename = fnUpload.value; alert(filename); var mime = filename.toLowerCase().substr(filename.lastIndexOf(