var p = new Promise(function(resolve, reject) { setTimeout(resolve, 500, "start"); });

p.then(
    function(v) {
        console.log(v);
        return Promise.reject("a");
    },
    function(v) {
        console.log(v);
        return Promise.reject("A");
    }
).then(
        function(v) {
        console.log(v);
        return Promise.reject("b");
    },
    function(v) {
        console.log(v);
        return Promise.resolve("B");
    }
).then(
    function(v) {
        console.log(v);
        return Promise.reject("c");
    },
    function(v) {
        console.log(v);
        return Promise.reject("C");
    }
).then(
    function(v) {
        console.log(v);
        return Promise.reject("d");
    },
    function(v) {
        console.log(v);
        return Promise.reject("D");
    }
);

var p = new Promise(function(resolve, reject) { setTimeout(resolve, 6000, "one"); });

p.then(
    function(v) {
        console.log(v);
        return new Promise(function(resolve, reject) { setTimeout(resolve, 1000, "two"); });
    }
).then(
    function(v) {
        console.log(v);
        return new Promise(function(resolve, reject) { setTimeout(resolve, 1, "three"); });
    }
).then(
     function(v) {
        console.log(v);
    }
);

var p1 = new Promise(function(resolve, reject) { setTimeout(resolve, 1000, "11111"); });
var p2 = new Promise(function(resolve, reject) { setTimeout(resolve, 100, "22222"); });
var p3 = new Promise(function(resolve, reject) { setTimeout(resolve, 1500, "33333"); });

Promise.all([p1, p2, p3]).then(function(values) {
    // ["11111", "22222", "33333"] 
    console.log(values);
});

var p4 = new Promise(function(resolve, reject) { setTimeout(resolve, 2000, "aaaaa"); });
var p5 = new Promise(function(resolve, reject) { setTimeout(reject, 2600, "bbbbb"); });
var p6 = new Promise(function(resolve, reject) { setTimeout(resolve, 200, "ccccc"); });

Promise.all([p4, p5, p6]).then(function(values) {
    console.log(values);
}, function(values) {
    // bbbbb 
    console.log(values);
});

var p = new Promise(function(resolve, reject) { setTimeout(resolve, 500, "start"); });

p.then(function(v) {
    console.log("A");
    console.log(v);
    return Promise.reject("a");
}).then(function(v) {
    console.log("B");
    console.log(v);
    return Promise.resolve("b");
}).catch(function(v) {
    console.log("C")
    console.log(v);
});

//A
//start
//C
//a

var p1 = new Promise(function(resolve, reject) { setTimeout(resolve, 1500, "A"); });
var p2 = new Promise(function(resolve, reject) { setTimeout(resolve, 1000, "B"); });
var p3 = new Promise(function(resolve, reject) { setTimeout(resolve, 2000, "C"); });

Promise.race([p1, p2, p3]).then(function(v) {
    console.log(v);
});

//B