ES6 Promise

function cook(){
console.log('开始做饭。');
var p = new Promise(function(resolve, reject){ //做一些异步操作
setTimeout(function(){
console.log('做饭完毕！');
resolve('鸡蛋炒饭');
}, 1000);
});
return p;
}

//吃饭
function eat(data){
console.log('开始吃饭：' + data);
var p = new Promise(function(resolve, reject){ //做一些异步操作
setTimeout(function(){
console.log('吃饭完毕!');
resolve('一块碗和一双筷子');
}, 2000);
});
return p;
}

function wash(data){
console.log('开始洗碗：' + data);
var p = new Promise(function(resolve, reject){ //做一些异步操作
setTimeout(function(){
console.log('洗碗完毕!');
resolve('干净的碗筷');
}, 2000);
});
return p;
}
cook()
.then(function(data){
return eat(data);
})
.then(function(data){
return wash(data);
})
.then(function(data){
console.log(data);
});