//html部分
<button id="execute">open Tv</button>
<button id="undo">close Tv</button>
//js部分
var Tv={
open:function(){
console.log("open tv");
},
close:function(){
console.log("close tv");
}
}
var createCommand=function(receiver){
var execute=function(){
return receiver.open();//执行命令,打开Tv
}
var undo=function(){
return receiver.close();//执行命令,关闭Tv
}
return {
execute:execute,
undo:undo
}
}
var setCommand=function(command){
document.getElementById("execute").onclick=function(){
command.execute();//输出打开Tv
}
document.getElementById("undo").onclick=function(){
command.undo();//输出关闭Tv
}
}
setCommand(createCommand(Tv));