如何使方法和函数工作 - Javascript

Question

以下方法和功能不起作用，有人可以帮帮我吗？

hasMoreOscarsThan - this method accepts one actor object as a parameter and
    returns true if the actor has more Oscars than the one that is passed as
    a parameter and false otherwise.

现在编写以下函数：

getActorByName - this function expects a string as a parameter and returns
    the object in the actors array whose name property is equal to the
    string that is passed in (if there is one).

我的代码：

function Person(firstName, lastName, age, numOscars) {

    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
    this.numOscars = numOscars;
    this.hello = function() { console.log("Hello, my name is " + this.firstName); }
    this.hasMoreOscarsThan = function(x, y) {
        if (this.numOscars > this.numOscars) {
            return this.firstName;
        } else {
            return "False!";
        }
    }

};


var actors = new Array();
actors[0] = new Person("Leonardo", "DiCaprio", 41, 1);
actors[1] = new Person("Jennifer", "Lawrence", 25, 1);
actors[2] = new Person("Samuel L.", " Jackson", 67, 0);
actors[3] = new Person("Meryl", "Streep", 66, 3);
actors[4] = new Person("John", "Cho", 43, 0);

actors.forEach(function(item) {
    item.hello();
})

actors.forEach(function(item) {
    item.hasMoreOscarsThan();
})


function getActorByName(person) {
    console.log(actors.firstName + " " + actors.lastName);
}


function list() {
    var actorsLength = actors.length;
    for (var i = 0; i < actorsLength; i++) {
        getActorByName(actors[i]);
    }
}


var search = function(lastName) {
    var actorsLength = actors.length;
    for (var i = 0; i < actorsLength; i++) {
        if (lastName == actors[i].lastName) {
            getActorByName(actors[i]);
        }
    }
}


search("DiCaprio");

var getAverageAge;

getAverageAge = (actors[0].age + actors[1].age + actors[2].age + actors[3].age + actors[4].age) / actors.length;
console.log(getAverageAge);

提前非常感谢！！！

Answer 1

我编辑了你的代码：

function Person(firstName, lastName, age, numOscars) {

    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
    this.numOscars = numOscars;
    this.hello = function() { console.log("Hello, my name is " + this.firstName); }
    this.hasMoreOscarsThan = function(x) { // x is a compare parameter
        if (this.numOscars > x) { // comparing numOscars with argument x
            return this.firstName;
        } else {
            return "False!";
        }
    }

};


var actors = new Array();
actors[0] = new Person("Leonardo", "DiCaprio", 41, 1);
actors[1] = new Person("Jennifer", "Lawrence", 25, 1);
actors[2] = new Person("Samuel L.", " Jackson", 67, 0);
actors[3] = new Person("Meryl", "Streep", 66, 3);
actors[4] = new Person("John", "Cho", 43, 0);

actors.forEach(function(item) {
    item.hello();
})

actors.forEach(function(item) {
    console.log(item.hasMoreOscarsThan(2)); // I put compare argument 2 and print result to console
})


function getActorByName(person) {
    console.log(person.firstName + " " + person.lastName); // changed actors to person
}


function list() {
    var actorsLength = actors.length;
    for (var i = 0; i < actorsLength; i++) {
        getActorByName(actors[i]);
    }
}


var search = function(lastName) {
    var actorsLength = actors.length;
    for (var i = 0; i < actorsLength; i++) {
        if (lastName == actors[i].lastName) {
            getActorByName(actors[i]);
        }
    }
}


search("DiCaprio");

var getAverageAge;

getAverageAge = (actors[0].age + actors[1].age + actors[2].age + actors[3].age + actors[4].age) / actors.length;
console.log(getAverageAge);

结果：

你好，我叫莱昂纳多

你好，我叫詹妮弗

你好，我是塞缪尔 L。

你好，我叫梅丽尔

你好，我叫约翰

错误！ 假的！
假的！
梅丽尔
假的！
莱昂纳多·迪卡普里奥 48.4

Answer 2

参数是personobject，但你指的是一些actors，它没有在函数内部的任何地方定义，所以改为person.firstName&person.lastName

function getActorByName(person) {
    console.log(person.firstName + " " + person.lastName);
}

JSFIDDLE