PubSub.js
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/**
* Created by goto9 on 2019/3/8.
*/
class PubSub {
constructor() {
this.PubSubCache = {
$uid: 0
};
}
on(type, handler) {
let cache = this.PubSubCache[type] || (this.PubSubCache[type] = {});
handler.$uid = handler.$uid || this.PubSubCache.$uid++;
cache[handler.$uid] = handler;
}
emit(type, ...param) {
let cache = this.PubSubCache[type],
key,
tmp;
if(!cache) return;
for(key in cache) {
tmp = cache[key];
cache[key].call(this, ...param);
}
}
off(type, handler) {
let counter = 0,
$type,
cache = this.PubSubCache[type];
if(handler == null) {
if(!cache) return true;
return !!this.PubSubCache[type] && (delete this.PubSubCache[type]);
} else {
!!this.PubSubCache[type] && (delete this.PubSubCache[type][handler.$uid]);
}
for($type in cache) {
counter++;
}
return !counter && (delete this.PubSubCache[type]);
}
}
export default new PubSub()