javascript io.sockets.on() 之外的 socket.send
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/8281382/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
socket.send outside of io.sockets.on( )
提问by Nyxynyx
I have a loop that querys a database continuously. When the query returns a result, the node.js app will send a message to every client connected to the node server via socket.io v0.8.
我有一个连续查询数据库的循环。当查询返回结果时，node.js 应用程序将通过 socket.io v0.8 向连接到节点服务器的每个客户端发送一条消息。
Problem:io.sockets.broadcast.send('msg')is called in the middle of a setInterval()loop so it is not within an io.sockets.on()'s callback function and thus this will not work. When io.sockets.send('msg')is used, no message seems to be sent to the client.
问题：io.sockets.broadcast.send('msg')在setInterval()循环中间调用，因此它不在io.sockets.on()的回调函数内，因此这将不起作用。当io.sockets.send('msg')使用时，没有消息似乎被发送到客户端。
Node.js code
Node.js 代码
setInterval(function() {
util.log('Checking for new jobs...');
dbCheckQueue(function(results) {
if (results.length) {
io.sockets.broadcast.send('hello');
}
});
}, 10*1000);
However, if the setIntervalis to be called from within io.sockets.on('connection',..), every connected client will create an additional loop!
但是，如果setInterval要从内部调用io.sockets.on('connection',..)，则每个连接的客户端都会创建一个额外的循环！
Node.js code
Node.js 代码
io.sockets.on('connection', function(socket) {
setInterval(function() {
util.log('Checking for new jobs...');
dbCheckQueue(function(results) {
if (results.length) {
io.sockets.send('hello');
}
});
}, 10*1000);
});
Clientside JS
客户端JS
socket.on('hello', function() {
console.log('HELLO received');
})
*How can I get a SINGLE loop to run, but still be able to send a message to all connected clients?
*如何让单循环运行，但仍然能够向所有连接的客户端发送消息？
回答by Nyxynyx
I think that this will successfully solve your problem
我认为这将成功解决您的问题
io.sockets.emit('hello')
