javascript - 如何为 Firefox OS TCP 套接字设置超时

Question

我正在开发 firefox-os尝试通过 TCP Socket API 按顺序连接到 IP 列表的应用程序。

但是，如果在几秒钟内没有连接，或者连接处于非事件状态超过几秒钟，我想关闭套接字。

示例:

var socket = navigator.mozTCPSocket.open(IP, port);
//would like to set timeout for connection here
socket.onopen = function(event){
    var serviceRequest = new Object();
    serviceRequest.type = "myService";
    var sendStr = JSON.stringify(serviceRequest);
    sendStr+="\n";
    sendStr = sendStr.toString('utf-8');
    socket.send(sendStr);
    //and would like a timeout for receiving data here
    socket.ondata = function(event){
        //etc
    }
}

Answer 1

据我所知，没有办法指定超时。如果你想指定一个超时，你应该使用常用的javascript setTimeout，存储它的id。

使用 TCPSocket 对象上的 onopen 事件取消超时。如果超时被触发。您可以在套接字上调用 close 方法。

var socket = navigator.mozTCPSocket.open(IP, port);

var timeout = setTimeout(function () {
    socket.close()
}, timeoutDuration)

//would like to set timeout for connection here
socket.onopen = function(event){
    // Prevent from timingout if open
    clearTimeout(timeout)

    var serviceRequest = new Object();
    serviceRequest.type = "myService";
    var sendStr = JSON.stringify(serviceRequest);
    sendStr+="\n";
    sendStr = sendStr.toString('utf-8');
    socket.send(sendStr);
    //and would like a timeout for receiving data here
    socket.ondata = function(event){
        //etc
    }
}