//定義組合對象var Folder = function (name) {this.name = name;this.parent = null;this.files = [];};Folder.prototype.add = function (file) {file.parent = this;if(this.files.indexOf(file) === -1){this.files.push(file);}else{console.log('/''+file.name+'/'已存在,添加失敗');}};Folder.prototype.scan = function () {if(this.parent){console.log('開始掃描/''+this.parent.name+'/': '+this.name);}else{console.log('開始掃描根目錄: '+this.name);}//關(guān)鍵在這里，調(diào)用所有它的葉對象的接口方法scan()for(var i = 0, file; file = this.files[i++];){file.scan();}};Folder.prototype.remove = function (file) {var n = this.files.indexOf(file);if(n === -1){console.log('無法刪除: /''+file.name+'/'不存在:');}if(n >= 0){this.files.splice(n,1);console.log('成功刪除:'+file.name);}};//定義葉對象var File = function (name) {this.name = name;this.parent = null;};File.prototype.add = function () {console.log('不能添加在文件下面');};File.prototype.scan = function () {console.log(this.parent.name+': '+this.name);};File.prototype.remove = function (file) {console.log('無法刪除: /''+file.name+'/'不存在:');};//測試var folder = new Folder('目錄');var folder1 = new Folder('學(xué)習(xí)質(zhì)料');var folder2 = new Folder('javascript');var file1 = new File('Node.js');var file2 = new File('qq.jpg');folder.add(folder1);folder.add(folder1);folder.add(folder2);folder1.add(file1);folder2.add(file2);//'學(xué)習(xí)質(zhì)料'添加成功//'學(xué)習(xí)質(zhì)料'已存在,添加失敗//'javascript'添加成功//'Node.js'添加成功//'qq.jpg'添加成功folder.remove(folder1);folder.remove(folder1);file1.remove(file1);//成功刪除:學(xué)習(xí)質(zhì)料//無法刪除: '學(xué)習(xí)質(zhì)料'不存在://無法刪除: 'Node.js'不存在:folder.scan(); //這里相當(dāng)于執(zhí)行了一個宏命令//開始掃描根目錄: 目錄//開始掃描'目錄': javascript//javascript: qq.jpg