How to obtain the micro-letter version number of JS _javascript tips

Micro-letters are now almost universally used, but the micro-mail version has been updated, different versions have different functions, so it is important to understand the micro-letter version number, so that they can update the experience of new features in a timely manner. So how to use JS to obtain the micro-letter version number?

First, to judge the micro-letter version number

var wechatinfo = Navigator.userAgent.match (/micromessenger\\/([\\d\\.] +)/i);
if (!wechatinfo) {
  alert ("This activity only supports micro-letters");
} else if (Wechatinfo[1] < "5.0") {
  alert ("This activity only supports micro-letter 5.0 versions"); 
  }

Where the value of wechatinfo[1] is the version number

Second, JS to determine whether in the micro-letter browser Open

function Is_weixn () {
  var ua = Navigator.userAgent.toLowerCase ();
  if (Ua.match (/micromessenger/i) = = "Micromessenger") {return
    true;
  } else {return
    false
  ;
}}

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