Saving the canvas 保存画布

Saving the transformation state 保存转换状态

The saveCanvas() method saves the current canvas transformation state. The method usually works in conjunction with the restoreCanvas() method.
saveCanvas()方法可以保存当前画布的转换状态。这个方法通常与restoreCanvas()方法联用。

$('canvas').saveCanvas();

The method also accepts a number of parameters as an object, discussed below.
这个方法也接收一些参数作为对象，下边讨论。

Saving successively 依次保存

Setting the count property to a positive integer will save the canvas that many times. For example, if the count property has a value of 3, the method would save the canvas three times.
将count属性设置为正整数，就可以将画布保存count次。例如，如果count属性值为3，这个方法就会保存画布3次。

$('canvas').saveCanvas({
  count: 3
});

Layers 层

Although it may seem slightly counterintuitive, the saveCanvas()method can actually be drawn as a layer. This allows for restoring masks or transformations when drawing layers.
尽管这似乎有些违反直觉，但saveCanvas()方法实际上可以绘制为一个层。这个特点允许在绘制层时恢复遮罩或转换。
To do this, set the layer property to true, just as you would to make any other shape a layer. In addition, just as you can with any other type of layer, you can give this layer a name using the name property.
为了做到这点，要将layer属性设置为true，就像你将其它任意图形设置为层一样。还有，就像你对其它类型的层做的那样，你也可以用name属性给这个层命名。

$('canvas').saveCanvas({
  layer: true,
  name: 'save1'
});