惰性实例化

JS

var myNamespace = function() {
    var Configure = function() {
        var privateName = "someone's name";
        var privateReturnName = function() {
            return privateName;
        }
        var privateSetName = function(name) {
            privateName = name;
        }
        //返回单例对象
        return {
            setName : function(name) {
                privateSetName(name);
            },
            getName : function() {
                return privateReturnName();
            }
        }
    }
    //储存configure实例
    var instance;
    return {
        getInstance : function() {
            if(!instance) {
                instance = Configure();
            }
            return instance;
        }
    }
}();
//使用方法上就需要getInstance这个函数作为中间量
myNamespace.getInstance().getName();

//惰性实例化的变体
var myNamespace2 = function() {
    var Configure = function() {
        var privateName = "someone's name";
        var privateReturnName = function() {
            return privateName;
        }
        var privateSetName = function(name) {
            privateName = name;
        }
        //返回单例对象
        return {
            setName : function(name) {
                privateSetName(name);
            },
            getName : function() {
                return privateReturnName();
            }
        }
    }
    //储存configure的实例
    var instance;
    return {
        init : function() {
            //如果不存在实例，就创建单例实例
            if(!instance) {
                instance = Configure();
            }
            //创建Configure单例
            for(var key in instance) {
                if(instance.hasOwnProperty(key)) {
                    this[key] = instance[key];
                }
            }
            this.init = null;
            return this;
        }
    }
}();
//使用方式：
myNamespace2.init();
myNamespace2.getName();