在javascript中调用私有函数

Question

I'm trying to make private functions in Javascript. Here is my code:

function Person() {
  this.id = 5;
};

Person.prototype = {
  getId: function() {
    return this.id;
  },
  walk: function() {
    alert("i am private");
  },
  eat: function() {
    alert("i am public");
  }
};

I want to make walk function private one and eat function is public .

Answer 1

There is no constructions in JavaScript to define real private methods for class, but you can do so:

var Person = (function () {
    var Person = function () {
        this.id = 5;
    };

    var walk = function () {
        alert("i am private");
    };

    Person.prototype = {
        constructor: Person,
        getId: function (){
            return this.id;
        },
        eat: function () {
            alert("i am public");
        }
    };

    return Person;
}());