const previewImageRatio = previewImageWidth / previewImageHeight; // 原圖寬高比例
                        let thumbnailHeight,thumbnailWidth;// 縮略圖高和寬
                        if(previewImageRatio > 1){
                            thumbnailWidth = 100; // 縮略圖寬度固定為 100
                            thumbnailHeight = thumbnailWidth / previewImageRatio;
                        }else{
                            thumbnailHeight = 100;
                            thumbnailWidth = thumbnailHeight * previewImageRatio;
                        }