jianghh-canvas/es/event/index.js

canvas画板，支持笔写、手写、鼠标流畅绘图，自动保存，撤销重做

var o = Object.defineProperty;
var f = (i, s, t) => s in i ? o(i, s, { enumerable: !0, configurable: !0, writable: !0, value: t }) : i[s] = t;
var e = (i, s, t) => (f(i, typeof s != "symbol" ? s + "" : s, t), t);
class h {
  constructor() {
    e(this, "events");
    this.events = {};
  }
  // 订阅事件
  on(s, t) {
    this.events[s] = this.events[s] || [], this.events[s].push(t);
  }
  // 发布事件
  emit(s, ...t) {
    this.events[s] && this.events[s].forEach((n) => {
      n(...t);
    });
  }
  // 取消订阅
  off(s, t) {
    this.events[s] && (this.events[s] = this.events[s].filter((n) => n !== t));
  }
}
function c(i) {
  const s = new h();
  i.$on = s.on.bind(s), i.$emit = s.emit.bind(s), i.$off = s.off.bind(s);
}
export {
  h as EventBus,
  c as useEventBus
};