如何使用fabricJS从画布中的图像对象中删除剪辑路径蒙版？

var canvas = new fabric.Canvas('canvas');

fabric.Image.fromURL('image.jpg', function(img) {
  canvas.add(img);
});

var path = new fabric.Path('M 0 0 L 200 0 L 200 200 L 0 200 Z');

img.set({
  clipPath: path
});

img.set({
  clipPath: null
});

var canvas = new fabric.Canvas('canvas');

fabric.Image.fromURL('image.jpg', function(img) {
  canvas.add(img);

  var path = new fabric.Path('M 0 0 L 200 0 L 200 200 L 0 200 Z');
  img.set({
    clipPath: path
  });

  // 删除剪辑路径蒙版
  img.set({
    clipPath: null
  });

  canvas.renderAll();
});