/*1.方法调用模式：

    先定义一个对象，然后在对象的属性中定义方法，通过myobject.property来执行方法，this即指当前的myobject

    对象。*/

        var car = {

            carId:123,

            carName:"奥迪",

            carColor:"red",

            say:function(){

                console.log(this.carName+" color is "+this.carColor);

            }

        };

        car.say();

    /*2.函数调用模式

    定义一个函数，设置一个变量名保存函数，这时this指向到window对象。*/

        var mycar = function(name,color){

        　　return "my car is " +color+" and "+name ;

        }

        console.log(mycar("奥迪","红色"));

    /*3.构造器调用模式

    定义一个函数对象，在对象中定义属性，在其原型对象中定义方法。在使用prototype的方法时，必须实例化该对象才能调用其方法。*/

        var yourcar = function(name,color){

            this.name = name;

            this.color = color;

        };

        yourcar.prototype ={

            say:function(){

                console.log("your car is " +this.name + " and " +this.color);

            }

        };

        var yourcar = new yourcar("奔驰","蓝色");

        yourcar.say();

    /*4.apply,call调用模式*/

        function count(num1, num2) {

            return num1 + num2;

        }

        console.log(count.call(window, 10, 10)); //20

        console.log(count.apply(window,[10,20])); //30

        window.a=100;

        window.b=300;

        var myobject={a:40,b:50};

        var sum = function(){

        　　return this.a+this.b;

        };

        var sum1 = sum.call(window);

        // var sum2 = sum.call(myobject);

        var sum2 = sum.apply(myobject);

        console.log(sum1+"========="+sum2);

        // 发现apply()和call()的真正用武之地是能够扩充函数赖以运行的作用域，如果我们想用传统的方法实现

        window.a=100;

        window.b=300;

        var myobject={a:40,b:50};

        function sum(){

            console.log(this.a+this.b);

        }

        console.log(sum());

        myobject.sumnumber = sum;

        console.log(myobject.sumnumber());

        window.color = "red";

        var o = { color: "blue" };

        function sayColor(){

            console.log(this.color);

        }

        sayColor();

        var OSayColor = sayColor.bind(o);

        OSayColor(); //blue