ES6---Promise 4:

    var p1 = new Promise((resolve, reject) => {
    });
    var p2 = p1.then(
        result => { },
        error => { }
    );
    //可以看到p1和p2都是promise，还可以看到状态
    console.log(p1);
    console.log(p2);

    var p1 = new Promise((resolve, reject) => {
        resolve(‘成功了‘);
    });
    var p2 = p1.then(
        result => {
            console.log(‘2‘);
        },
        error => { }
    );

    console.log(p1);
    console.log(p2);

    var p1 = new Promise((resolve, reject) => {
        resolve(‘成功了‘);//运行在主线程
    }).then(
        result => {
            console.log(‘2‘);//运行在微任务列表
        },
        error => { }
    );
    console.log(‘abc‘);

    //传值的问题
    var p1 = new Promise((resolve, reject) => {
        resolve(‘成功了‘);//运行在主线程
    }).then(
        result => {
            console.log(‘微任务接收数据:‘ + result);//运行在微任务列表
        },
        error => { }
    );
    console.log(‘abc‘);

    var p1 = new Promise((resolve, reject) => {
        resolve(‘成功了‘);//运行在主线程
    }).then(
        result => {
            console.log(‘微任务接收数据:‘ + result);//运行在微任务列表
        },
        error => { }
    ).then(
        result => {
            console.log(3);
        },
        error => { }
    )
    console.log(‘abc‘);

    var p1 = new Promise((resolve, reject) => {
        resolve(‘成功了‘);//运行在主线程
    }).then(
        result => {
            console.log(‘微任务接收数据:‘ + result);//运行在微任务列表
        },
        error => { }
    ).then(
        result => {
            console.log(3 + result);
        },
        error => { }
    )
    console.log(‘abc‘);

    var p1 = new Promise((resolve, reject) => {
        resolve(‘成功了‘);//运行在主线程
    }).then(
        result => {
            console.log(‘微任务接收数据:‘ + result);//运行在微任务列表
            //这里怎么传值？答案用return
            return ‘bbbb‘;
        },
        error => { }
    ).then(
        result => {
            console.log(3 + result);//Na  N
        },
        error => { }
    )
    console.log(‘abc‘);