js怎么判断安卓系统版本

function getAndroidVersion() {
    var userAgent = navigator.userAgent;
    var androidVersion = null;

    if (/Android/i.test(userAgent)) {
        var match = userAgent.match(/Android\s([0-9\.]*)/);
        if (match) {
            androidVersion = match[1];
        }
    }

    return androidVersion;
}

var version = getAndroidVersion();
console.log("安卓版本: " + version);

function getAndroidVersion() {
    var userAgent = navigator.userAgent;
    var androidVersion = null;

    if (/Android/i.test(userAgent)) {
        var match = userAgent.match(/Android\s([0-9]+(?:\.[0-9]+)*);/);
        if (match) {
            androidVersion = match[1];
        }
    }

    return androidVersion;
}