canvas图片转换base64,由于图片过大，ios获取url失败？-灵析社区

`stackoverflow`有个类似的问题: > [https://stackoverflow.com/questions/40482586/getcontext2d-returns-null-in-> safari-10](https://link.segmentfault.com/?enc=krU8YTKQ4ejXYI4WobAqpA%3D%3D.IGkPK1oViRFBv6jU1ttuf2yduMNJrvM%2FYQyHH%2FtWxzHPsmeNFbAgTEpVqryllUNHAxR0HZrSzTpgTwAutdVdLNuJkHWiQ2zRNZFcNgYuqwr6eg0yZfSkT%2BAGzO9oU2LW) 解决方式 > > [https://zhuanlan.zhihu.com/p/540761999](https://link.segmentfault.com/?enc=7oGBy8Gy8RgO1X18n%2B%2BGrA%3D%3D.0WE2Q%2FrXU4gpO8YRwEkvedojDccwmLRUS7uTK2N4XJJWMjG6PZIXx5xXQ2Wv2Otd)