javascript - 使用构造函数创建对象数组

Question

我想要一个包含 Person 对象的 People 数组，以便我可以从数组索引访问该对象中的字段。

通常我会选择对象集合或列表等。

你能帮我完成这个工作吗？...

var people = [];

var person = {
    firstName:"John",
    age:50
  };



function newPerson(){       
    var p = new person();   //<<< #1. Is this a good approach in JS?
    p.firstName = "Fred";
    p.age = 21;

    people.push(p);
}


function totalAge(){

    var totalAge =0; 
    for (i = 0; i < people.length; i++){
        totalAge += people[i].age;   //<<<<< #2. This is the kind of access I want.
    }
}

Answer 1

试试这个，JsBin sourses

    var people = [];

    function Person(name, age){  // Function constructor
      this.name = name;          // do not forget 'this.'
      this.age = age;
    }

    function addPerson(name,age){    
        var p = new Person(name,age); // here we create instance
        people.push(p);
    }

    addPerson("Petia", 80);
    addPerson("Vasia", 20);


    function totalAge(){
        var total = 0;      // do not name local variables same as function
        var i;             // use var for i variable, otherwise it would be global variable 
        for (i = 0; i < people.length; i++){
            total += people[i].age; 
        }
        return total;
    }

    var total = totalAge();
    console.log(total);