我如何设置预览画布的尺寸，我尝试设置但不起作用

Question

我从https://github.com/blueimp/jQuery-File-Upload下载了该演示，并且运行正常。我想更改默认的预览画布大小，高度为158，高度为139。我尝试从jquery.fileupload-image.js更改它：

$.widget('blueimp.fileupload', $.blueimp.fileupload, {
    options: {
      // The regular expression for the types of images to load:
      // matched against the file type:
      loadImageFileTypes: /^image\/(gif|jpeg|png|svg\+xml)$/,
      // The maximum file size of images to load:
      loadImageMaxFileSize: 10000000, // 10MB
      // The maximum width of resized images:
      imageMaxWidth: 1920,
      // The maximum height of resized images:
      imageMaxHeight: 1080,
      // Defines the image orientation (1-8) or takes the orientation
      // value from Exif data if set to true:
      imageOrientation: false,
      // Define if resized images should be cropped or only scaled:
      imageCrop: false,
      // Disable the resize image functionality by default:
      disableImageResize: true,
      // The maximum width of the preview images:
      previewMaxWidth: 158,
      previewMinWidth: 158,
      // The maximum height of the preview images:
      previewMaxHeight: 139,
      previewMinHeight: 139,
      // Defines the preview orientation (1-8) or takes the orientation
      // value from Exif data if set to true:
      previewOrientation: true,
      // Create the preview using the Exif data thumbnail:
      previewThumbnail: true,
      // Define if preview images should be cropped or only scaled:
      previewCrop: false,
      // Define if preview images should be resized as canvas elements:
      previewCanvas: false
    },
//...

但是仅画布宽度被更改，我尝试设置PreviewCanvas，但画布仍然存在。 如何设置预览画布大小？