javascript鴨弁別式模擬インターフェース

var Interface = function(name,methods){

    if(arguments.length != 2){

        throw new Error("Interface constructor called with" + arguments.length+"arguments,but expected exactly 2.");

    }

    

    this.name;

    this.methods = [];

    for(var i = 0,len = methods.length; i < len; i++){

        if(typeof methods[i] !== 'string'){

            throw new Error("Interface constructor expects method names to be passed in a STRING");

        }

        this.methods.push(methods[i]);

    }

};

//define a interface: var NewInterface = interface('NewInterface',[funa,funb...]);

Interface.ensureImplements = function(object){

    if(arguments.length < 2){

        throw new Error("Function Interface.ensureImplements called with" + arguments.length + "arguments,but expected at least 2.");

    }

    

    for(i = 1,len = arguments.length; i < len; i++){

        var interface = arguments[i];

        if(interface.constructor !== Interface){

            throw new Error("Function Interface.ensureImplements expects arguments two and above to be instance of Interface.");

        }

        for(var j = 0,methodsLen = interface.methods.length;j < methodsLen;j++){

            var method = interface.methods[j];

            if(!object[method] || typeof object[method] !== 'function'){

                throw new Error("Function Interface.ensureImplements:does not implement the " + interface.name + "interface.Method" + method + "was not found.");

            }

        }

    }

}

//Interface.ensureImplements(object,interface_a,interface_b);

var NewInterface = interface('NewInterface',[funa,funb...]);

    NewInterface
      

Interface.ensureImplements(object,interface_a,interface_b);
  object              【             ，  javascript       】。