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renderToCanvas should await initCtx #3
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感谢大佬，终于找到正确的方法了 |
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renderToCanvas 应该等待 ctx/canvas 获取并创建之后执行
解决问题：有些需求进入页面就需要生成 canvas/图片，目前解决办法只能加 setTimeout 来延迟 renderToCanvas。