javascript - 我的带有对象和方法的 JavaScript 代码无法正常工作

Question

我现在正在使用 JavaScript，自从我研究对象以来已经过去了几天，所以我决定尝试制作自己的对象。问题是我的代码并不能真正工作。它只打印第一个对象。我确信我会在这里得到很好的答案，因为当我学习和实验 HTML5 和 CSS 时，这个地方对我帮助很大。非常感谢!

var person_1st = {
  name: "Plamen",
  surname: "Dobrev",
  age: "14",
  favourite_colour: "blue"
};

document.write(person_1st.name + "<br />" + person_1st.surname + "<br />" + person_1st.age + "<br />" + person_1st.favourite_colour);



function person_2nd(name, surname, age, favourite_colour) {
  this.name = name;
  this.surname = surname;
  this.age = age;
  this.favourite_colour = favourite_colour;
  this.new_favourite_colour = function(favourite_colour) {
    this.favourite_color = favourite_colour;
  };
};

var person_2nd_Plamen = new person_2nd("Plamen", "Dobrev", 14, "blue");
person_2nd_Plamen.new_favourite_color("red");
document.write(person_2nd_Plamen.name + "<br />" + person_2nd_Plamen.surname + "<br />" + person_2nd_Plamen.age + "<br />" + person_2nd_Plamen.favourite_colour);




function person_3rd(name, surname, age, favourite_colour) {
  this.name = name;
  this.surname = surname;
  this.age = function(age) {
    this.age = age;
  };
  this.favourite_colour = favourite_colour;
};

var person_3rd_Plamen = new person_3rd("Plamen", "Dobrev", 14, "blue");
person_3rd_Plamen.age(15);
document.write(person_3rd_Plamen.name + "<br />" + person_3rd_Plamen.surname + "<br />" + person_3rd_Plamen.age + "<br />" + person_3rd_Plamen.favourite_colour);



function person_4th(name, surname, age, favourite_colour) {
  this.name = name;
  this.surname = surname;
  this.age = new_age;
  this.favourite_colour = favourite_colour;
};

function new_age() {
  return 15;
};

var person_4th_Plamen = new person_4th("Plamen", "Dobrev", 14, "blue");
document.write(person_4th_Plamen.name + "<br />" + person_4th_Plamen.surname + "<br />" + person_4th_Plamen.age + "<br />" + person_4th_Plamen.favourite_colour);

Answer 1

尝试这样的事情来理解:

function Person() {
  this.name;
  this.surname;
  this.age;
  this.favourite_colour;
  this.assign = function(n, s, a, fc) {
    this.name = n;
    this.surname = s;
    this.age = a;
    this.favourite_colour = fc;
  }
}
var p = new Person(); // create object
p.assign("Plamen", "Dobrev", "18", "blue")
alert(p.name);

var p = [];
p.push(new Person());
p[0].assign("Plamen", "Dobrev", "18", "blue"); // first index
alert(p[0].age); // get age of first index for example