Please help, how to click a button in ASP.NET, a "Save Picture As" dialog box pops up

爱你一棒槌

That ’s it. In a webpage, I have an image. When I click a button, a "Save Image As" dialog box pops up. How do I write this in front-end javascript and how do I use it? If I use back-end code, how do I write it? Question It's more urgent, please help!

shenmue024

Response.Clear ();
         Response.ContentType = "application / octet-stream";
      
     
        Response.AddHeader ("content-disposition", "attachment; filename = aa.jpg");
        Response.WriteFile (Server.MapPath ("aa.jpg"));
        Response.End ();

摩羯可乐

Upstairs solution, save the picture as a stream