Dropzone 的“勾号”标记没有显示？

I have been using dropzone to upload the image file on my localhost. Everything is working fine, file is being uploaded and saved, however, the progress bar is not replaced by the tick mark. It stays there. Here is a screenshot

在这种情况下可能是什么问题，这是我的 dropzone 代码

 Dropzone.options.myAwesomeDropzone = {
        paramName: "userPhoto", // The name that will be used to transfer the file
        maxFilesize: 20, // MB
        maxFiles: 1,
        acceptedFiles: ".jpeg,.jpg",
        dictDefaultMessage: 'Drag an image here to upload, or click to select one',
        accept: function (file, done) {
           done();
        },

    };

use res.end('File have been uploded')在您路线的尽头。使用 dropzone 时，如果未触发 res.end，则不会确认文件已上传。因此动画不起作用