facade-signalr-client/dist/events/index.js

facade signalr client

class EventBus {
    constructor() {
        /**
         * 注册监听事件
         * @param {string} eventName 事件名称
         * @param {ICallback} callback 回调函数
         */
        this.on = (eventName, callback) => {
            if (!this.callbacks[eventName]) {
                this.callbacks[eventName] = [];
            }
            this.callbacks[eventName].push(callback);
        };
        /**
         * 关闭监听事件
         * @param {string} eventName 事件名称
         * @param {ICallback} callback 回调函数
         */
        this.off = (eventName, callback) => {
            const events = this.callbacks[eventName];
            if (!events) {
                return;
            }
            let index = -1;
            for (let i = 0; i < events.length; i++) {
                if (events[i] === callback) {
                    index = i;
                    break;
                }
            }
            if (index < 0) {
                return;
            }
            this.callbacks[eventName].splice(index, 1);
        };
        /**
         * 触发事件
         * @param {string} eventName 事件名称
         * @param {T} args 事件入参
         */
        this.trigger = (eventName, ...args) => {
            const events = this.callbacks[eventName];
            if (!events || !events.length) {
                return;
            }
            for (const callback of events) {
                callback.apply(this, args);
            }
        };
        this.callbacks = {};
    }
}
export default new EventBus();
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