Function.prototype.apply(thisArg,argArray);
Function.prototype.call(thisArg[,arg1[,arg2…]]);

 <script type="text/javascript">//定义一个函数func1，具有属性p和方法A
        function func1() {this.p = "func1-";this.A = function (arg) {alert(this.p + arg);}}//定义一个函数func2，具有属性p和方法B
        function func2() {this.p = "func2-";this.B = function (arg) {alert(this.p + arg);}}var obj1 = new func1();var obj2 = new func2();obj1.A("byA"); //显示func1-byAobj2.B("byB"); //显示func2-byBobj1.A.apply(obj2, ["byA"]); //显示func2-byA，其中[“byA”]是仅有一个元素的数组，下同obj2.B.apply(obj1, ["byB"]); //显示func1-byBobj1.A.call(obj2, "byA"); //显示func2-byAobj2.B.call(obj1, "byB"); //显示func1-byB</script>

function sum(a,b){
return a+b;
}
alert(sum.length);

 <script type="text/javascript"><!--//创建两个空对象var obj1 = new Object();var obj2 = new Object();//给两个对象都添加属性p，并分别等于1和2obj1.p = 1;obj2.p = 2;//给obj1添加方法，用于显示p的值obj1.getP = function () {alert(this.p); //表面上this指针指向的是obj1
        }//调用obj1的getP方法
        obj1.getP();//使obj2的getP方法等于obj1的getP方法obj2.getP = obj1.getP;//调用obj2的getP方法
        obj2.getP();
//--></script>

var user={
name:"jack", //定义了name属性，初始化为jack
favoriteColor:["red","green","black","white"],//定义了颜色喜好数组
hello:function(){ //定义了方法hello
alert("hello,"+this.name);
},
sex:"male" //定义了性别属性sex，初始化为sex
}
user.hello();       //"hello,jack"

var user={
name:"jack", //定义了name属性，初始化为jack
favoriteColor:["red","green","black","white"],//定义了颜色喜好数组
hello:function(){ //定义了方法hello
alert("hello,"+name);
},
sex:"male" //定义了性别属性sex，初始化为sex
}
user.hello();      //"hello,"

name="hongda";
var user={
name:"jack", //定义了name属性，初始化为jack
favoriteColor:["red","green","black","white"],//定义了颜色喜好数组
hello:function(){ //定义了方法hello
alert("hello,"+name);
},
sex:"male" //定义了性别属性sex，初始化为sex
}
user.hello();          //"hello,hongda"

  name = "hongda";var user = {name: "jack", //定义了name属性，初始化为jackfavoriteColor: ["red", "green", "black", "white"], //定义了颜色喜好数组hello: function () { //定义了方法helloname = "hongdadada";alert("hello," + name);},sex: "male" //定义了性别属性sex，初始化为sex
        }user.hello();     //"hello,hongdadada"

 function fun() {name = "hongdada";function show() {  //没有意义alert(name);}}var f = new fun();console.dir(f);

 function fun() {this.name = "hongdada";this.show=function show() {alert(name);}}var f = new fun();console.dir(f);

function func(a,b){
alert(a);
alert(b);
for(var i=0;i<arguments.length;i++){
alert(arguments[i]);
}
}
func(1,2,3);   //1,2,1,2,3

 <script type="text/javascript">function dwn(s) {document.write(s + "<br/>");}//定义一个多边形（Polygon）类型
        function Polygon() {//存放多边形的顶点var m_points = [];m_points = Array.apply(m_points, arguments);//用上面介绍的那种方式定义getter
            function GETTER() { };GETTER.prototype = m_points[0];this.firstPoint = new GETTER();//公有属性this.length = {valueOf: function () { return m_points.length },toString: function () { return m_points.length }}//添加一个或多个顶点this.add = function () {m_points.push.apply(m_points, arguments);}//取得序号为idx 的顶点this.getPoint = function (idx) {return m_points[idx];}//设置特定需要的顶点this.setPoint = function (idx, point) {if (m_points[idx] == null) {m_points[idx] = point;}else {m_points[idx].x = point.x;m_points[idx].y = point.y;}}}//构造一个三角形pvar p = new Polygon({ x: 1, y: 2 }, { x: 2, y: 4 }, { x: 2, y: 6 });dwn(p.length);           //3dwn(p.firstPoint.x);     //1dwn(p.firstPoint.y);     //2p.firstPoint.x = 100; //不小心写了它的值dwn(p.getPoint(0).x); //1 不会影响到实际的私有成员delete p.firstPoint.x; //恢复dwn(p.firstPoint.x);    //1p.setPoint(0, { x: 3, y: 4 }); //通过setter 改写了实际的私有成员dwn(p.firstPoint.x); //3 getter 的值发生了改变dwn(p.getPoint(0).x);  //3</script>

 function dwn(s) {document.write(s + "<br/>");}function App() {var fun={};var arr = Array.apply(null, arguments);var arr2 = Array.apply(arr2, arguments);var arr3 = Array.apply(fun, arguments);var arr4 = Array.apply(window, arguments);dwn(arr);dwn(arr2);dwn(arr3);dwn(arr4);}App(1, 2, 3, 4, 5, 6, 7, 8);

   function Class1() {this.name = "class1";this.showNam = function () {alert(this.name);}}function Class2() {this.name = "class2";}var c1 = new Class1();var c2 = new Class2();c1.showNam.call(c2);    //class2

   function Class1() {this.showTxt = function (txt) {alert(txt);}}function Class2() {Class1.call(this);}var c2 = new Class2();c2.showTxt("cc");     //cc

function Class1() {this.showTxt1 = function (txt) {alert("Class1:"+txt);}}function Class0() {this.showTxt0 = function (txt) {alert("Class0:"+txt);}}function Class2() {Class0.call(this);Class1.call(this);}var c2 = new Class2();c2.showTxt0("cc");c2.showTxt1("cccc");

var Class = {create: function() {return function() {this.initialize.apply(this, arguments);}}
}

  var vehicle=Class.create();vehicle.prototype = {initialize: function (type) {this.type = type;},showSelf: function () {alert("this vehicle is " + this.type);}}var moto=new vehicle("Moto");
moto.showSelf();