js判断現在オペレーティングシステム

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

function isAndroidOrIOS() {
    var u = navigator.userAgent, app = navigator.appVersion;
    var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //Android  
    var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); // ios  
    if (isAndroid) {
		//          
    }
    if (isIOS) {
		//    ios    
    }
}

//       false            ，      true              
function IsPC() {
    var userAgentInfo = navigator.userAgent;
    var Agents = ["Android", "iPhone",
        "SymbianOS", "Windows Phone",
        "iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}