您可以尝试创建一个socket.io连接到服务器。如果它成功了，那么它就是在倾听。如果它失败了，那么显然它没有在听。这里有一个方法可以做到这一点：

// check a socket.io connection on another server from a node.js server
// can also by used from browser client by removing the require()
// pass hostname and port in URL form
// if no port, then default is 80 for http and 443 for https
// 2nd argument timeout is optional, defaults to 5 seconds
var io = require('socket.io-client');

function checkSocketIoConnect(url, timeout) {
    return new Promise(function(resolve, reject) {
        var errAlready = false;
        timeout = timeout || 5000;
        var socket = io(url, {reconnection: false, timeout: timeout});
        
        // success
        socket.on("connect", function() {
            clearTimeout(timer);
            resolve();
            socket.close();
        });
        
        // set our own timeout in case the socket ends some other way than what we are listening for
        var timer = setTimeout(function() {
            timer = null;
            error("local timeout");
        }, timeout);
        
        // common error handler
        function error(data) {
            if (timer) {
                clearTimeout(timer);
                timer = null;
            }
            if (!errAlready) {
                errAlready = true;
                reject(data);
                socket.disconnect();
            }
        }
        
        // errors
        socket.on("connect_error", error);
        socket.on("connect_timeout", error);
        socket.on("error", error);
        socket.on("disconnect", error);
        
    });
}

checkSocketIoConnect("http://192.168.1.10:8080").then(function() {
    // succeeded here
}, function(reason) {
    // failed here
});

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