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用canvas生成带logo二维码，toDataURL保存图片时，中间的logo图片丢了，只剩下二维码图片了 #31

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qinmao opened this issue Aug 14, 2017 · 1 comment
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用canvas生成带logo二维码，toDataURL保存图片时，中间的logo图片丢了，只剩下二维码图片了 #31

qinmao opened this issue Aug 14, 2017 · 1 comment

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@qinmao
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qinmao commented Aug 14, 2017 •
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@wangqilinqqq
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因为里面 new Image() 的时候有一个 onload 事件，所以当时是获取不到里面的logo的，可以在 qrcode 函数增加一个回调函数 ，在onload 时间执行时触发回调，此时就可以获取到里面的logo了。下面是我的代码截图：
image

image

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@wangqilinqqq @qinmao