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callback 回调不准确 #18

@likaixuan

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@likaixuan

Description

我需要通过 wx.canvasToTempFilePath 获取画布的临时路径、但它必须是draw 绘制完成之后才能获取 我无法通过callback来完成这个操作(在安卓机型上它比draw要快)、目前只能通过callback加定时器延时来解决

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