var single = function (name) {
        this.name = name;
        this.instance = null;
    };
    single.prototype.getName = function (){
        alert(this.name);
    };
    single.getInstance = function (name) {
        if( !this.instance ){
            this.instance = new single(name);
        }
        return this.instance;
    };
    var a = single.getInstance(‘sev1‘);
    var b = single.getInstance(‘sev2‘);
    alert( a === b);

var creatDiv = (function () {
        var instance;
        var creatDiv = function (html) {
            if(instance){
                return instance;
            }
            this.html = html;
            this.init();
            return instance = this;
        };
        creatDiv.prototype.init = function () {
            var div = document.createElement(‘div‘);
            div.innerHTML = this.html;
            document.body.appendChild(div);
        };
        return creatDiv;
    })();
    var a = new creatDiv(‘sev1‘);
    var b = new creatDiv(‘sev2‘);
    alert( a === b );

 var creatDiv = function (html) {
            if(instance){
                return instance;
            }
            this.html = html;
            this.init();
            return instance = this;
        };

var creatDiv = function () {
        this.html = html;
        this.init();
    };
    creatDiv.prototype.init = function () {
        var div = document.createElement(‘div‘);
        div.innerHTML = this.html;
        document.body.appendChild(div);
    };

var ProxySingletonCreatDiv = (function () {
        var instance;
        return function (html) {
            if(!instance){
                instance = new creatDiv( html );
            }
            return instance;
        }
    })();
    var a = ProxySingletonCreatDiv(‘sev1‘);
    var b = ProxySingletonCreatDiv(‘sev2‘);
    alert( a === b );

var namespace = {
    a:function(){
        alert(1);
    },
    b:function(){
        alert(2);
    }
}

var user = (function () {
        var _name = ‘sven‘,
            _age = 29;
        return {
            getUserInfo : function () {
                return _name + ‘-‘ + _age;
            }
        }
    })();

var createLogin = function () {
        var div = document.createElement(‘div‘);
        div.innerHTML = ‘我是登录弹窗‘;
        div.style.display = ‘none‘;
        document.body.appendChild(div);
        return div;
    };

 var bindEvent = function () {
        $(‘div‘).one(‘click‘, function () {
            alert(‘click‘);
        })
    };
    bindEvent();
    bindEvent();
    bindEvent();

用getSingle函数也可以达到一样的效果，
    var bindEvent = getSingle(function () {
        document.getElementById(‘btn‘).addEventListener( ‘click‘, function () { //原书用的onclick，验证过这个执行几次也是执行一次，改成了事件绑定的模式
            console.log(‘ssss‘)
        });
        return true;
    });
    bindEvent()
    bindEvent()