ES6 Promise 시작

  var promise=new Promise(function(resolve,reject){
  	if(/* */){
  		resolve(value);	//resolve Promise pending resolve, , 
  	}else{
  		reject(error);	//reject Promise pending rejected, , 
  	}
  })

  promise.then(function(value){
  	//success code ...
  },function(err){	// 
  	//error code ...    
  })

  getJSON('/post/1.json').then(function(post) {
  	return getJSON(post.commentURL);
  }).then(function(comments) {
  	// some code
  }).catch(function(error) {
  	//  Promise , getJSON then
  });

 let thenable = {
 	then: function(resolve, reject) {
 		resolve(42);
 	}
 };
 let p1 = Promise.resolve(thenable);
 p1.then(function(value) {
 	console.log(value); // 42
 });

 setTimeout(function(){	// 
 	console.log('three');
 },0)
 Promise.resolve().then(function(){	// 
 	console.log('two');
 })
 console.log('one');	// 
 // :one two three

  const thenable = {
  	then(resolve, reject) {
  		reject(' ');
  	}
  };
  Promise.reject(thenable)
  .catch(e => {
  	console.log(e === thenable)	//Promise.reject(thenable) thenable catch e, reject 
  })
  // true

 asyncFunc()
 	.then(f1)
 	.catch(r1)
 	.then(f2)
 	.done();
 // done 
 Promise.prototype.done=function(onFulfilled, onRejected){
 	this.then(onFulfilled, onRejected)	// then , onFulfilled, onRejected 
 		.catch(function(reason){
 			setTimeout(() => {throw reason},0)
 		})
 }

  const f = () => console.log('now');
  Promise.resolve().then(f);
  console.log('next');
  // next
  // now
  // f , Promise , 

 const f = () => console.log('now');
 (async () => f())();	
 // , async , f , then .
 // async() = > f()  f() , promise.catch 
 console.log('next');
 // now
 // next
 // 
 (async() => f())()
 	.then(...)
 	.catch(...)

 const f = () => console.log('now');
 (
 	() => new Promise(
 		resolve => resolve(f())
 	)
 )();
 console.log('next');
 // now
 // next
 		
  , Promise.try(f)