JavaScript學習之介面__JavaScript

鴨式辨型法實現JavaScript介面：

//ya shi bian li 法實現介面//介面檢驗，要能夠檢驗是否實現個介面，及介面中所有的方法//定義介面對象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 method name is error!');}this.methods.push(methodArray[i]);}}//聲明介面執行個體var CompositInterface = new Interface("CompositInterface",["add","edit"]); var FormItemInterface = new Interface("FormItemInterface",["delete","select"]);//定義實作類別，實現這兩個介面var InterfaceImp = function(){}InterfaceImp.prototype.add = function(){}InterfaceImp.prototype.edit = function(){}InterfaceImp.prototype.delete = function(){}// IntefaceImp.prototype.select = function(){// }//檢驗介面執行個體是否實現 介面的所有方法Interface.ensureImplements = function(object){if(arguments.length < 2){throw new Error("介面檢驗的方法，參數不能少於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 + "沒有實現介面" + tmpInterface.name +"的方法" + methodName);}}}return true;}var instance = new InterfaceImp();Interface.ensureImplements(instance,CompositInterface,FormItemInterface);instance.add();