用chooseimage获得的临时路径，调用canvas的drawImage会报错
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- Canvas.cancelAnimationFrame: 小程序/开发/API/画布/Canvas/Canvas.cancelAnimationFrame
- Canvas.cancelAnimationFrame#参数: 小程序/开发/API/画布/Canvas/Canvas.cancelAnimationFrame
- Canvas.getContext: 小程序/开发/API/画布/Canvas/Canvas.getContext
- Canvas.cancelAnimationFrame#功能描述: 小程序/开发/API/画布/Canvas/Canvas.cancelAnimationFrame
- Canvas.getContext#参数: 小程序/开发/API/画布/Canvas/Canvas.getContext