如何使方法和功能工作 - Javascript

Question

以下方法和函數不工作，有人可以幫助我嗎？

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. 

現在寫了以下功能：

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). 

我的代碼：

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); 

非常感謝你提前！

Answer 1

我編輯您的代碼：

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); 

因此， ：

你好，我的名字是萊昂納多

你好，我的名字是珍妮弗

你好，我的名字叫塞繆爾·

你好，我的名字是梅麗爾

你好，我的名字是John

錯！ 錯！
錯！
Meryl
錯！
萊昂納多 48.4

Answer 2

的說法是person對象，但你是指一些actors未在函數內部的任何地方定義，因此改爲person.firstName & person.lastName

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

JSFIDDLE