操作，命令，执行分离。 把操作封装成命令，然后执行、 //javascript 模式var cannon = {// 大炮shot: function(){console.log('大炮射击');}
操作，命令，执行分离。
把操作封装成命令，然后执行、
//javascript 模式var cannon = { // 大炮 shot: function(){ console.log('大炮射击'); }};var plane = { // 飞机 bomb: function(){ console.log('飞机投弹'); }, retreat: function(){ console.log('飞机撤退'); }};var PlaneCommand = function(obj){ return { execute: function(){ obj.bomb(); }, undo: function(){ obj.retreat(); } }}var CannonCommand = function(obj){ return { execute: function(){ obj.shot(); } }}var setCommand = function(btn1, command){ btn1.onclick = function(){ command.apply(this, arguments); }}// 创建按钮var createButton = function(name){ var btn = document.createElement('button'); btn.innerHTML = name; return document.body.appendChild(btn);}var cannonCommand = CannonCommand(cannon);var planeCommand = PlaneCommand(plane);var btn1 = createButton('飞机轰炸');var btn2 = createButton('飞机撤退');var btn3 = createButton('大炮射击');setCommand(btn1, planeCommand.execute);setCommand(btn2, planeCommand.undo);setCommand(btn3, cannonCommand.execute);
