这个是解决pdf.js直接访问本地文件所存在的问题，C#通过链接地址把获取到的文件转换base64，然后传给html前台，前台再通过jquery进行数据解码处理，再传给view.js或pdf.js进行解析展示。(This is pdf.js direct access to the local file to solve the existing problems, C# to get to the file conversion through Base64 link address, and then passed to the HTML reception, reception and data through the jQuery decoding process, and then to the view.js or pdf.js resolution display.)