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原生的CanvasRenderingContext2D的所有属性都进行了 get set处理了,导致CanvasRenderingContext2D的属性读取和写入都会有性能损失
这个应该可以优化,通过手动mock一个虚拟CanvasRenderingContext2D,应该可以提高CanvasRenderingContext2D的性能