The interface of JavaScript learning __javascript

Duck-type discrimination method to implement JavaScript interface:

Ya Shi Bian Li method to implement interface//interface inspection, to be able to verify the implementation of an interface, and interface all the methods//Definition interface object var Interface = function (Interfacename,methodarray
				{if (Arguments.length < 2) {throw new Error (' The instance of interface constructor must be 2 length ');
				} this.name = InterfaceName;
				This.methods = [];
				var length = Methodarray.length; for (var i = 0; i < length i + +) {if (typeof Methodarray[i]!= ' string ') {throw new Error (' The Interface met
					Hod name is error! ');
				} this.methods.push (Methodarray[i]); 
			}//Declare interface instance var compositinterface = new Interface ("Compositinterface", ["Add", "edit"]);

			var formiteminterface = new Interface ("Formiteminterface", ["Delete", "select"]); Defines the implementation class that implements the two interfaces var interfaceimp = function () {} InterfaceImp.prototype.add = function () {} interfaceimp. Prototype.edit = function () {} InterfaceImp.prototype.delete = function () {}//Intefaceimp.prototyp
E.select = function () {//}
			Verify that the interface instance implements all of the methods of the interface interface.ensureimplements = function (object) {if (Arguments.length < 2) {throw new
				Error ("interface test method, parameters can not be less than 2");
					for (var i = 1; i < arguments.length i++) {var tmpinterface = arguments[i];
						for (var j = 0, length = tmpInterface.methods.length J < length; J + +) {var methodname = tmpinterface.methods[j];  if (!object[methodname] | | typeof object[methodname]!= ' function ') {throw new Error (Object.constructor.name +
						"No interface" + Tmpinterface.name + "method" + methodname);
			}} return true;
			var instance = new Interfaceimp ();
			Interface.ensureimplements (Instance,compositinterface,formiteminterface); Instance.add ();