var nickNames = {};handleMessageBroadcasting = function(socket, nickNames){ socket.on('message', function(message){ socket.broadcast.to(message.room).emit('message', { text: nickNames[socket.id] + ': ' + message.text }); });};handleMessageBroadcasting(socket, nickNames);上面handleMessageBroadcasting函数内部用到了nickNames,我是将nickNames当参数传入再使用呢?还是直接当成全局变量来使用好呢?为什么?
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