JavaScript常用的2种定义类的方式

function Car(sColor, iDoors, iMpg) { 
this .color = sColor;

this .doors = iDoors;

this .mpg = iMpg;

this .drivers = new Array(“Mike”, “Sue”);

}

Car.prototype.showColor = function () {

alert( this .color);

};

var oCar1 = new Car(“red”, 4 , 23 );

var oCar2 = new Car(“blue”, 3 , 25 );

oCar1.drivers.push(“Matt”);

alert(oCar1.drivers); // outputs “Mike,Sue,Matt”

alert(oCar2.drivers); // outputs “Mike,Sue”

function Car(sColor, iDoors, iMpg) { 
this .color = sColor;

this .doors = iDoors;

this .mpg = iMpg;

this .drivers = new Array(“Mike”, “Sue”);

if ( typeof Car._initialized == “undefined”) {

Car.prototype.showColor = function () {

alert( this .color);

} ;

Car._initialized = true ;

}

}