以下為構(gòu)造函數(shù)方法創(chuàng)建類：

復制代碼 代碼如下:

function className (prop_1, prop_2, prop_3) {
this.prop1 = prop_1;
this.prop2 = prop_2;
this.prop3 = prop_3;}

復制代碼 代碼如下:

var obj_1 = new className(v1, v2, v3)
var obj_2 = new className(v1, v2, v3)

復制代碼 代碼如下:

function className (prop_1, prop_2, prop_3) {
this.prop1 = prop_1;
this.prop2 = prop_2;
this.prop3 = prop_3;
this.func = function new_meth (property) {
//coding here
}
}

在JavaScript里，對象的屬性默認都是全局的，也就是說，對象內(nèi)外都可以直接訪問該屬性。上面例子里this.prop1, this.prop2, this.prop3都是全局屬性。

如何定義私有屬性呢？使用var，下面的例子里，price就變成了私有屬性！

復制代碼 代碼如下:

function Car( listedPrice, color ) {
var price = listedPrice;
this.color = color;
this.honk = function() {
console.log("BEEP BEEP!!");
};
}

復制代碼 代碼如下:

this.getPrice = function() {
//return price here!
return price;
--------------------------------------------------------------------------------

使用以下語法繼承：

復制代碼 代碼如下:

ElectricCar.prototype = new Car();

復制代碼 代碼如下:

myElectricCar instanceof Car

復制代碼 代碼如下:

// 使用構(gòu)造函數(shù)定義一個新的對象
function ElectricCar( listedPrice ) {
this.electricity=100;
var price = listedPrice;
}

// 使新對象繼承Car
ElectricCar.prototype = new Car();

// 為新對象添加方法
ElectricCar.prototype.refuel = function(numHours) {
this.electricity =+ 5*numHours;
};

復制代碼 代碼如下:

function Car( listedPrice ) {
var price = listedPrice;
this.speed = 0;
this.numWheels = 4;

this.getPrice = function() {
return price;
};
}

Car.prototype.accelerate = function() {
this.speed += 10;
};

function ElectricCar( listedPrice ) {
var price = listedPrice;
this.electricity = 100;
}
ElectricCar.prototype = new Car();

// 重寫accelerate方法
ElectricCar.prototype.accelerate = function() {
this.speed += 20;
};
// 添加新方法decelerateElectricCar.prototype.decelerate = function(secondsStepped) {
this.speed -= 5*secondsStepped;
};

myElectricCar = new ElectricCar(500);

myElectricCar.accelerate();
console.log("myElectricCar has speed " + myElectricCar.speed);
myElectricCar.decelerate(3);
console.log("myElectricCar has speed " + myElectricCar.speed);