//声明一个类,与普通的类的声明不一样,
function Girl() {
//将类的事件声明成一个私有的属性,里面是一个对象
this._events = {}
} /*
{
"失恋":["哭","吃","购物"]
}
*/ Girl.prototype.on = function (eventName,callback) {
if (this._events[eventName]){
//如果已经在里面了,说明不是第一次失恋了
this._events[eventName].push(callback);
} else{
this._events[eventName] = [callback,];
}
}; Girl.prototype.emit = function (eventName,...args) {
if (this._events[eventName]){
this._events[eventName].forEach(cb=>cb(...args));
}
}; // 声明一个实例
let girl = new Girl();
let cry = (who)=>{console.log(who+"哭")};
let eat = (who)=>{console.log(who+"吃")};
let shoping = (who)=>{console.log(who+"购物")}; //监听
girl.on("失恋",cry);
girl.on("失恋",eat);
girl.on("失恋",shoping); //触发的时候传入应的数据,后面的多个参数就是数据
girl.emit("失恋","殷超"); /*
监听一个"失恋"的这样一个事件,但是这个事件里面包含多个操作。
是一个数组 ["哭","吃","购物"]
*/