Native.js获取android有线网络IP地址

刚上手Native.js 请教问题如下：
想通过Native.js 获取Android有线网络IP地址，提示这一行console.log(en.hasMoreElements());报错：
Uncaught TypeError: undefined is not a function

/*获取有线网络IP*/  
function getLocalIp() {  
    var ip = "127.0.0.1";  
    if (plus.os.name == "Android") {  
        var Enumeration = plus.android.importClass("java.util.Enumeration");  
        var NetworkInterface = plus.android.importClass("java.net.NetworkInterface");  
        var en = NetworkInterface.getNetworkInterfaces();  
        console.log(en.hasMoreElements());  
        while (en.hasMoreElements()) {  
            var ni = en.nextElement();  
            var interfaceName = ni.getDisplayName();  
            console.log("tag", "网络名字" + interfaceName);  
        }  
        /* Android实现  
        // 获取本地设备的所有网络接口  
        Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();  
        while (en.hasMoreElements()) {  
            NetworkInterface ni = en.nextElement();  
            String interfaceName = ni.getDisplayName();  
            Log.i("tag", "网络名字"   interfaceName);