Dropzone.js 调整图像大小以适合缩略图大小

我正在尝试调整缩略图中的图像大小以固定框大小。我试过这个：

Dropzone.options.myAwesomeDropzone = {
            maxFiles: 20,
            maxFilesize: 2,
            maxThumbnailFilesize: 20,
            acceptedFiles: 'image/*,.jpg,.png,.jpeg',
            thumbnailWidth:"250",
            thumbnailHeight:"250",
            init: function() {
                var dropzone = this, xhrs = [];
                $.each(uploadedImages, function (index, path) {
                    var xhr = new XMLHttpRequest();
                    xhr.open('GET', path);
                    xhr.responseType = 'blob';//force the HTTP response, response-type header to be blob
                    xhr.onload = function() {
                        var file = new File([xhr.response], '', {'type': xhr.response.type});
                        //dropzone.addUploadedFile(file);
                        dropzone.emit("addedfile", file);
                        dropzone.emit("thumbnail", file, path);
                        dropzone.emit("complete", file);
                    };
                    xhrs.push(xhr);
                    xhr.send();
                });
                this.options.maxFiles = this.options.maxFiles - uploadedImages.count;
            }
        };

这是原始图像的外观：http://files.parsetfss.com/12917a88-ac80-4e5e-a009-fc634161b79c/tfss-6c59b59f-8f57-4610-966e-31bbc203707b-samsung-galaxy-note-4-7290-002.jpg http://files.parsetfss.com/12917a88-ac80-4e5e-a009-fc634161b79c/tfss-6c59b59f-8f57-4610-966e-31bbc203707b-samsung-galaxy-note-4-7290-002.jpg

And this is how it's displayed :

我也尝试过：

thumbnailWidth:"300",
thumbnailHeight:"300",
===
thumbnailWidth:"400",
thumbnailHeight:"400",

但一切都没有改变，thumbnailWidth and thumbnailHeight没有影响

我遇到了同样的问题，但是如果您手动调用 dropzone 的调整大小功能，缩略图将处于正确的尺寸：

var file = new File([xhr.response], '', {'type': xhr.response.type});
dropzone.createThumbnailFromUrl(file,path);
dropzone.emit("addedfile", file);
dropzone.emit("thumbnail", file, path);
dropzone.emit("complete", file);