/*Basic Singleton*/var Singleton = ｛         attribute1：true,         attribute2:10,         method1:function(){},　　　　　method2:function(){}｝;

var box = {        width:0,        height:0,        getArea:function(){            return this.width*this.height;//js中对象成的访问必须是显示的，即this是不能省略的，报错        },        init:function(w,h){        //    width = w;        //    height = h;这种方式相当于定义了两个全局变量，（没加var声明的变量为全局变量）        //    并不是对对象width和height的赋值        //下面是正确的            this.width = w;            this.height = h;        }    }//box划分了一个命名空间，命名空间里的变量只在空间里有效

var box = {        width:0,        height:0,        getArea:function(){            return width*height;        },        init:function(w,h){            width = w;            height = h;        }    }window.onload = function(){        width = 0;        height = 0;        //or box.init(0,0);        var init = box.getArea();    alert(init);}

var circle = (function(){//pravite member!    var r = 5;    var pi = 3.1416;//后面用分号    return{//public member        getArea:function(){            return r*r*pi;//访问私有成员不要加this        },//后面用逗号        //如果想改变r和pi的值，只能通过设置一个公有的函数来实现        init:function(setR){            r = setR;        }    }})()window.onload = function(){    circle.r = 0;//无法访问私有成员,相当于又为circle创建了一个共有成员r    alert(circle.getArea());        circle.init(0);//通过公有的工具函数便可以访问了。    alert(circle.getArea());    };

// 利用单体的分支技术来定义XHR（XMLHttpRequest）对象,必须要用闭包才可以实现var XHR = (function(){    //The three branches    var standard = {        cXHR:function(){                return new XMLHttpRequest();            }        };    var activeXNew = {        cXHR:function(){                return new ActiveXObject(‘Msxml2.XMLHttp‘);            }        };    var activeXOld = {        cXHR:function(){                return new ActiveXObject(‘Microsoft.XMLHttp‘);            }        };    //To assign(分配) the branch, try each method;return whatever doesn‘t fail    var testObject;    try{        testObject = standard.cXHR();        return standard;// return this branch if no error was thrown     }catch(e){        try{            testObject = activeXNew.cXHR();            return activeXNew;        }catch(e){            try{                testObject = activeXOld.cXHR();                return activeXOld;            }catch(e){                throw new Error(‘Create the XMLHttpRequestObject failed!‘);                }        }    }})();window.onload = function(){    alert(XHR.cXHR());    }