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| var Emitter=function(){
this._listeners={};
};
//注册事件
Emitter.prototype.on=function(eventName,callback){
var listeners=this._listeners[eventName]||[];
listeners.push(callback);
this._listeners[eventName]=listeners;
}
//触发事件
Emitter.prototype.emit=function(eventName){
var args=Array.prototype.slice.apply(arguments).slice(1),
listeners=this._listeners[eventName],
self=this;
if(!Array.isArray(listeners))return;
listeners.forEach(function(callback){
try{
callback.apply(this,args);
}catch(e){
console.error(e);
}
});
}
//实例
var emitter=new Emitter();
emitter.on('event',function(arg1,arg2){
console.log('get event',arg1,arg2);
})
console.log('emit event');
emitter.emit('event','arg1','arg2');
|
