dist/cropper.common.js
function scaleY(_scaleY) {
    var scaleX = this.imageData.scaleX;
    return this.scale(isNumber(scaleX) ? scaleX : 1, _scaleY);
  }
function scaleY(_scaleY) {
    var scaleX = this.imageData.scaleX;
    return this.scale(isNumber(scaleX) ? scaleX : 1, _scaleY);
  }
Scale the image on the y-axis.
@param {number} scaleY - The scale ratio on the y-axis.
@returns {Cropper} this