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微信小程序为啥canvasToTempFilePath:fail fail canvas is empty?

微信小程序为啥canvasToTempFilePath:fail fail canvas is empty?


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如果是uniapp的话,uni.canvasToTempFilePath的第二个参数增加this,例如:

uni.canvasToTempFilePath({
  x: 100,
  y: 200...

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