code: function setAspectRatio(aspectRatio) {
      var options = this.options;
  
      if (!this.disabled && !isUndefined(aspectRatio)) {
        // 0 -> NaN
        options.aspectRatio = Math.max(0, aspectRatio) || NaN;
  
        if (this.ready) {
          this.initCropBox();
  
          if (this.cropped) {
            this.renderCropBox();
          }
        }
      }
  
      return this;
    }
docs: Change the aspect ratio of the crop box.
  @param {number} aspectRatio - The new aspect ratio.
  @returns {Cropper} this