function myfun1(){    //这是私有属性    var private1 = "这是私有属性1";    var privateMethod = function(){        alert(private1);    }    //这是实例属性    this.publicvar = "这是实例属性1";    this.public1 = function(){        privateMethod();    }}//-//--------------//-//--------------------------------- var newfun1 = new myfun1();newfun1.public1(); //这是私有属性alert(newfun1.publicvar);//这是实例属性alert(newfun1.private1); // undefined   newfun1.privateMethod(); //运行错误//--//--//---///------------------------------------------//--//--//---///-------------------执行1-------------------//--//--//---///------------------------------------------function myfun2(){}myfun2.staticvar = "这是静态属性2";myfun2.staticmethod = function(){    alert(myfun2.staticvar);}//--//--//---///------------------------------------------//--//--//---///-------------------执行2-------------------//--//--//---///------------------------------------------var newfun2 = new myfun2();//newfun2.staticmethod();//运行错误;alert(newfun2.staticvar);//undefined//------//-------------//-------------------------------//静态私有成员var myfun3 = (function(){    function privateProperty(){        }    privateProperty.staticvar = "这是静态私有成员3";    privateProperty.staticmethod = function(){        alert(privateProperty.staticvar);    }    privateProperty.staticmethod();    return privateProperty})();alert(newfun3.staticvar);//这是静态私有成员3//---//--------//-----------------//-------------//静态类var funcount = 0;var myfun4 = new function(){    funcount++;    this.printCount = function(){        alert(funcount);    }}myfun4.printCount(); //输出1;myfun4.printCount(); //输出1;myfun4.prototype.amethod = function(){    alert("原型对象4");}//运行错误var newfun4 = new myfun4();newfun4.amethod();//------------------//---------------------------------//运行错误,说明myfun3创建并实例化之后就不能再为它添加方法,属性new myfun3.constructor().printCount();//如果你确实想实例化,这样也可以.//原型继承var myfun5 = function(){}myfun5.prototype.myfun5_extend = function(){    alert("这是原型继承的5");}var myfun5_sub = function(){}myfun5_sub.prototype = new myfun5();var newfun5 = new myfun5_sub();newfun5.myfun5_extend(); //这是原型继承的//调用继承var myfun6 = function(){    this.method_p = function(){        alert("这是调用继承的6");    }}var myfun6_sub = function(){    myfun6.call(this);}var newfun6 = new myfun6_sub();newfun6.method_p();//这是调用继承的//覆盖var myfun7 = function(){    this.method = function(){        alert("这是父对象方法7");    }}var myfun7_sub = function(){    this.method = function(){        alert("这是子对象方法8");    }}myfun7_sub.prototype = new myfun7();var newfun7 = new myfun7_sub();newfun7.method(); //这是子对象方法,父对象方法被覆盖了.//多态function myfun8(a, b){    var a = a;    var b = b;    if (typeof a == "number" && typeof b == "number") {        alert(a * b);    } else if (typeof a == "string" && typeof b == "string") {        alert(a + b);    } else {        alert("输入错啦");    }}myfun8(3, 4); // 输出12;myfun8("hi,", "你好");//输出hi,你好;myfun8("hi", 5);//输入错啦.