实验性
玩家发送聊天消息前触发的事件。
An event that fires as players enter chat messages.
若为 true，则表示在 beforeChat 事件处理器中设置为 true ，此消息不会被广播。
true
If set to true in a beforeChat event handler, this message is not broadcast out.
只读
正在广播的消息。
Message that is being broadcast.
发送聊天消息的玩家。
Player that sent the chat message.
可选
将接收此消息的玩家的可选列表。若定义了此列表，则此消息将直接发送给一个或多个玩家（即，不会广播到全局）。
Optional list of players that will receive this message. If defined, this message is directly targeted to one or more players (i.e., is not broadcast.)
玩家发送聊天消息前触发的事件。
An event that fires as players enter chat messages.