我有一个上传的形式，我想填充的文件，尤其是图像。

I've an upload form I would like to populate with a file, in particular an image.

我的理解是，我需要创建一个文件对象放置在相对格式的文件列表。目前，像我是在数据URI格式。数据：图像/ PNG; BASE64，...但我可以改变

My understanding is that I need to create a File object to put in the FileList of the relative form. Currently the image I have is in the data URI format "data:image/png;base64,..." but I can change that.

如果这是真的我怎么从图像中创建正确的文件对象，并将其添加到文件列表？如果不这样做，你提出一个更好的解决方案？

If that is true how do I create the correct File object from an image and add it to the FileList? If it is not do you suggest a better solution?

推荐答案

使用常规的形式和目标到一个iframe与显示器设置为none。

Use a regular form and target it to an iframe with display set as none.

<form id="my_form" enctype="multipart/form-data" action="upload_handler.php" method="POST" target="upload_target">
   <input name="uploadfile" type="file" />
   <input type="submit" value="Upload File" />
</form>
<iframe id="upload_target" name="upload_target" style="display:none;"></iframe>