判断qq内置浏览器和微信内置浏览器

var ua = navigator.userAgent.toLowerCase()，isWx = false,isQQ = false, isQQInstalled = false;if(ua.indexOf(' qq')>-1 && ua.indexOf('mqqbrowser') <0){//qq内置浏览器isQQInstalled = true;return;}if(ua.indexOf('mqqbrowser')> -1 && ua.indexOf(" qq")<0){//qq浏览器isQQ = true;return;}if (ua.match(/MicroMessenger/i) == 'micromessenger') {//微信浏览器isWx = true;return;}