遇到变化点封装它!
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title> change state </title>
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<meta name="generator" content="editplus" />
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<meta name="author" content="" />
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<meta name="keywords" content="" />
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<meta name="description" content="" />
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</head>
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<body>
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<input type="button" id="execBtn" value="show1" />
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<div id="show"></div>
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<script type="text/javascript">
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function Control(state){
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this.State = state;
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this.Execute = function(){
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this.State.Execute(this);
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}
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}
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function State(){
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this.Title = "title1";
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this.Execute = function(control){
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show.innerHTML = this.Title;
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execBtn.value = "show2";
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control.State = new State2();
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}
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}
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function State2(){
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this.Title = "title2";
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this.Execute = function(control){
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show.innerHTML = this.Title;
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execBtn.value = "show1";
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control.State = new State();
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}
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}
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var control;
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window.onload = function(){
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control = new Control(new State());
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control.Execute();
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}
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execBtn.onclick = function(){
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control.Execute();
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}
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</script>
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</body>
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</html>
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