Promise

http://www.hangge.com/blog/cache/detail_1638.html

//做饭

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);

});