Javascript:正确全局化 Websocket 发送功能

Question

我正在使用 WebSocket 并尝试能够在我的整个应用程序中随时发送套接字数据。当我尝试从另一个函数中访问发送命令时，我收到:

Uncaught InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable.

这只会在我调用函数时发生，这就是我设置 websocket 的方式:

Main.socket = (function() {
var socket = new WebSocket("ws://server:port");

socket.onopen = function() {  
    console.log("Socket has been opened!");  
}

function send() {
    socket.send('test');
}

return {
    socket: socket,
    send: send
}
})();

我能够在全局范围内调用该函数，而且当我从一个函数中使用 console.log Main.socket 时，它能够看到套接字。但是当我调用发送函数时，我得到了那个错误。

Answer 1

这是等待网络套接字连接上线的替代解决方案，将您的调用替换为:

function send() {
    web_socket.send('test');
}

用这个:

function send(msg) {

    wait_for_socket_connection(socket, function() {
        socket.send(msg);
    });
};

function wait_for_socket_connection(socket, callback){

    setTimeout(
        function(){
            if (socket.readyState === 1) {
                if(callback !== undefined){
                    callback();
                }
                return;

            } else {

                console.log("... waiting for web socket connection to come online");

                wait_for_socket_connection(socket,callback);
            }
        }, 5);
};