Detecting WeChat Browser with JavaScript

By reading the browser User-Agent and checking for "micromessenger", you can detect whether the page is opened inside WeChat''s built-in browser.

First read the browser UA and check whether it contains micromessenger. The function:

function isWeiXin(){
    var ua = window.navigator.userAgent.toLowerCase();
    if(ua.match(/MicroMessenger/i) == 'micromessenger'){
        return true;
    }else{
        return false;
    }
}

Call it wherever needed:

if(isWeiXin()){ // show DOM if inside WeChat client
    $('.store-apply').show();
}