js判断ios android

function getOS() {
    var userAgent = navigator.userAgent || navigator.vendor || window.opera;

    if (/android/i.test(userAgent)) {
        return "Android";
    }

    // iOS detection from: http://stackoverflow.com/a/9039885/177710
    if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        return "iOS";
    }

    return "Unknown";
}

// 使用示例
console.log("当前操作系统是：" + getOS());

function getOS() {
    var userAgent = navigator.userAgent || navigator.vendor || window.opera;
    var platform = navigator.platform;

    if (/android/i.test(userAgent)) {
        return "Android";
    }

    if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        return "iOS";
    }

    if (/Win32|Win64|MacIntel/.test(platform)) {
        return platform;
    }

    return "Unknown";
}

var currentOS = getOS();

// 后续使用时直接读取currentOS变量
console.log("当前操作系统是：" + currentOS);