事件的添加，触发，删除

function Events(){
}
Events.prototype.on=function(action,func){
this[action] = func;
}
Events.prototype.trigger= function (action) {
if(this.hasOwnProperty(action)){
this[action]();
}
}
Events.prototype.off = function(action){
if(this.hasOwnProperty(action)){
delete this[action];
}
}

var object = new Events();
//
object.on('sleep',function(){
console.log('sleep');
})
object.trigger('sleep');

object.off('sleep');

object.trigger('sleep');