用那个api都是找不到，打印canvas.getContext("2d”)中是存在这些api的
相关文档
- Canvas.cancelAnimationFrame: 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#参数: 小程序/开发/API/画布/Canvas/Canvas.cancelAnimationFrame
- 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
这样写
ctx.textAlign = 'center' ctx.fillStyle = 'black'参考
https://developers.weixin.qq.com/community/develop/article/doc/0008ac8993cee8d51b20447e368c13