《javascript设计模式》--接口

关于javascript设计模式书中的接口，记录如下

//TODO  增加了一个判断条件，可以只在生产环境中调用

 

var Interface = function(name,methods){
  if(arguments.length != 2){
   throw new Error('Interface constructor call with' + arguments.length + 'arguments,but expecter exactly 2.')
   }
   this.name = name;
   this.methods = [];
   for(var i = 0, len = methods.length; i < len; i++){
     if(typeof methods[i] !== 'string'){
       throw new Error('Imterface constructor expects method names as to be passed in as a string.')
     }
     this.methods.push(methods[i]);
   }
};
//static class method
Interface.ensureImplements = function(obj){
  if(arguments.length < 2){
    throw new Error('Function Interface.ensureImplements called with'+arguments.length +'arguments,but expected at least 2');
  }
  for(var 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 instances of Interface.')
     }
     for(var j = 0, methodsLen = interface.methods.length; j < methodsLen; j++){
       var method = interface.methods[j];
       if(!obj[method] || typeof obj[method] !== 'function'){
         throw new Error('Function Interface.ensureImplements: obj does\'s implement the '+ interface.name + ' interface.Method '+method +' was\'s found')
       }
    }
  }
  //TODO  pass
  return true;
};

用法如下：

//TODO define Interface
var Composite = new Interface('Composite',['add','remove','getChild']);
var FormItem = new Interface('FormItem',['save']);

//TODO  checkout implements
function addForm(formInstace,isDevelop){
  isDevelop && Interface.ensureImplements(formInstace, Composite, FormItem)
  //其他使用add,remove,getchild,save函数的代码段
}
//CompositeForm class
var CompositeForm = function(id, method, action){};
CompositeForm.prototype = {
  add: function(){},
  remove:function(){},
  getChild:function(){}
  ,save:function(){}
};

var testCompositeForm = new CompositeForm()
addForm(testCompositeForm,true)

 1 //TODO define Interface
 2 var Composite = new Interface('Composite',['add','remove','getChild']);
 3 var FormItem = new Interface('FormItem',['save']);
 4 
 5 //TODO  checkout implements
 6 function addForm(formInstace,isDevelop){
 7   isDevelop && Interface.ensureImplements(formInstace, Composite, FormItem)
 8   //其他使用add,remove,getchild,save函数的代码段
 9 }
10 //CompositeForm class
11 var CompositeForm = function(id, method, action){};
12 CompositeForm.prototype = {
13   add: function(){},
14   remove:function(){},
15   getChild:function(){}
16   ,save:function(){}
17 };
18 
19 var testCompositeForm = new CompositeForm()
20 addForm(testCompositeForm,true)