使用Promise代替进行回调

asyncTask1(data, function (data1){

    asyncTask2(data1, function (data2){

        asyncTask3(data2, function (data3){
                // .... 魔鬼式的金字塔还在继续
        });

    });

});

class Person {
    int age;
    String name;

    Person setAge(int age) {
        this.age = age;
        return this;
    }

    Person setName(String name) {
        this.name = name;
        return this;
    }
}
//使用时
Person p=new Person().setAge(20).setName("haha");