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[英]Using both anonymous functions and functions stored in variables as callback arguments JavaScript
[英]How are variables and references stored in anonymous functions in javascript?
我正在用node.js(带有socket.io)制作服务器,而这个特定问题困扰我的时间最长。 我为套接字连接制作了一个易于扩展的处理程序,以将每个不同的连接路由到一个不同的函数。
... <previous code> ...
var socketHandlers = {
'chat':chat.onMessage,
'chatNameRequest':chat.onNameRequest,
'changeRooms':commands.onPlayerRoomChange,
'commandEnter':commands.onCommandEnter
};
io.sockets.on('connection', function (socket) {
console.log("New client connected.");
// add all handlers to this socket when connected
for (var handler in socketHandlers) {
socket.on(handler, function(data) {
console.log("Resolved handler for " + handler + ", called function " + socketHandlers[handler]);
// sanitize each handler before sending it to the inner functions
// leave more specific sanitization for the inner function
data = valid.cleanData(data);
socket = valid.cleanSocket(socket);
// finally send it to the inner functions
socketHandlers[handler](socket, data);
});
}
});
但是,它似乎不起作用。 这是服务器的控制台输出:
debug - flashsocket received data packet 5:::{"args":{"name":"Timothy"},"name":"chatNameRequest"}
Resolved handler for commandEnter, called function function (socket, data) {
<function contents, etc>
如您所见,程序收到了“ chatNameRequest”请求,但错误地将其路由到“ commandEnter”。 有人可以阐明这里发生的事情吗?
查看console.log
输出的内容。 套接字收到消息commandEnter
,并将其路由到正确的处理程序。 发布客户代码?
另外,如Pointy所述,您应该研究.bind
( https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind ),因为您可能很快就会需要。
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