class EventBus {
constructor() {
this.events = this.events || {}; //{key:Array}
}
/**
* @param {String} eventName
* @param {Function} callback
*/
$on(eventName, callback) {
if (this.events[eventName]) {
this.events[eventName].push(callback);
} else {
this.events[eventName] = [callback];
}
}
/**
* @param {String} eventName
* @param {Function} callback
*/
$emit(eventName, data) {
if (this.events[eventName]) {
this.events[eventName].forEach(callback => {
callback && callback(data);
});
}
}
/**
* @param {String} eventName
* @param {Function} callback
*/
$once(eventName, callback) {
let _this = this;
function handler(args) {
callback.apply(_this, [args])
_this.$off(eventName)
}
this.$on(eventName, handler)
}
/**
* @param {String} eventName
*/
$off(eventName) {
if (eventName) {
this.events[eventName] && (delete this.events[eventName]);
} else {
this.events = [];
}
}
}
手写EventBus
猜你喜欢
转载自blog.csdn.net/RedaTao/article/details/122550567
今日推荐
周排行