javascript - When adding a QR code image to a mobile page, why are some browsers unable to recognize it?

I made a mobile page and put a QR code picture, but some mobile phones or some browsers did not have the recognition function.
Some people press and hold and are prompted that they need to download WeChat, but WeChat is already on the phone and the version is the latest. Is it a permissions issue?
How to implement the function of long-press recognition of QR codes now?

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I made a mobile page and put a QR code picture, but some mobile phones or some browsers did not have the recognition function.
Some people press and hold and are prompted that they need to download WeChat, but WeChat is already on the phone and the version is the latest. Is it a permissions issue?
How to implement the function of long-press recognition of QR codes now?

Isn’t long-pressing to identify QR codes a built-in function of your phone? It seems that the IP is not there

Long press to identify the QR code. I could only use it by opening the webpage in WeChat.