判断页面是不是用微信打开的

转载自：https://blog.csdn.net/Jason_WangYing/article/details/70739736

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