[Tip] Get the browser UA ID

This essay is a mere accumulation of small knowledge and will be labeled with a little knowledge later on.

By common, when downloading mobile app, only a QR code, but after scanning code, depending on whether the phone is iphone or Android download different apps, here is the code of this operation:

<! DOCTYPE HTML > 
The main thing here is to get the identity through navigator.useragent, and then output a string similar to the one below, and then determine the identity based on the keyword. It's simple.
"Mozilla/5.0 (iphone; CPU iphone OS 8_0 like Mac OS X applewebkit/600.1.3 (khtml, like Gecko) version/8.0 mobile/12a4345d safari/600.1.4 "
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[Tip] Get the browser UA ID