QRCode can be amplified on an android phone。What to do about it?

[asd8855]

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[asd8855]

I solved the problem。Modify the webView source property to source={{ html: "<meta name="viewport" content="width=device-width, initial-scale=1.0,maximum-scale=1.0, minimum-scale=1.0, user-scalable=no"><style>*{margin:0;padding:0;}canvas{transform:translateZ(0);}</style><script>var canvas = document.querySelector('canvas');(" + renderString + ").call(" + contextString + ", canvas);</script>" }}