JS-判断用户使用的终端是安卓还是IOS

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