serratus/quaggaJS

when reading the code, I get a black screen

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good day
I try https://serratus.github.io/quaggaJS/v1.0.0-beta.1/examples/scan-to-input/ the screen of my iphone turns black when read successfully. Data is written to textbox.

It turns out that the image turns off. And the window does not close.
How to install it?