After WeChat Mini Programs web-view calls the external web page, how to call the interface such as Wechat JSSDK scan code in the external web page?

questions such as
No complete examples of code scanning can be found on the Internet, who has WeChat end and embedded page code.

related codes

JSSDK
< script type= "text/javascript" src= " https://res.wx.qq.com/open/js.;></script>
is introduced into the embedded web page HTML like the official account. All I know is to quote this

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