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function EventBusClass() {
this.msgQueues = {};
}
EventBusClass.prototype = {
// 将消息保存到当前的消息队列中
on: function(msgName, func) {
if (Object.prototype.hasOwnProperty.call(this.msgQueues, msgName)) {
if (typeof this.msgQueues[msgName] === 'function') {
this.msgQueues[msgName] = [this.msgQueues[msgName], func];
} else {
this.msgQueues[msgName] = [...this.msgQueues[msgName], func];
}
} else {
this.msgQueues[msgName] = func;
}
},
// 消息队列中仅保存一个消息
one: function(msgName, func) {
// 无需检查msgName是否存在
this.msgQueues[msgName] = func;
},
// 发送消息
emit: function(msgName, msg) {
if (!Object.prototype.hasOwnProperty.call(this.msgQueues, msgName)) {
return;
}
if (typeof this.msgQueues[msgName] === 'function') {
this.msgQueues[msgName](msg);
} else {
this.msgQueues[msgName].map((fn) => {
fn(msg);
});
}
},
// 移除消息
off: function(msgName) {
if (!Object.prototype.hasOwnProperty.call(this.msgQueues, msgName)) {
return;
}
delete this.msgQueues[msgName];
}
};
// 将EventBus放到window对象中
const EventBus = new EventBusClass();
export default EventBus;