2.3.3 快捷方式
向默认命名空间中的所有客户端广播
io.sockets.emit('eventname',"eventdata");io.emit('eventname','eventdata')启动服务端
const io = require('socket.io');
const socket=io.listen(80,{/*选项*/});const io=require('socket.io');
const socket=io({/*选项*/})
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