# 十四.模版方法模式
- 模版方法模式在一个方法中定义一个算法的骨架，而将一些步骤的实现延迟到子类中
- 模版方法使得子类可以在不改变算法结构的情况下，重新定义算法中某些步骤的具体实现
- 一般有两部分组成，第一部分是抽象父类，第二部分是具体的实现子类
- 好莱坞原则，子类放弃了控制权，改由父类来调用
- 发布订阅
- 回调函数
# 1.类图
# 2.代码
class Person {
dinner(){
this.buy()
this.cook()
this.eat()
}
buy()
cook()
eat()
}
class Xiaomin extends Person {
buy(){
console.log('买黄瓜')
}
cook(){
console.log('拍黄瓜')
}
eat(){
console.log('吃黄瓜')
}
}
let x = new Xiaomin()
x.dinner()
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# 3.场景
# 3.1 提示框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<link rel="stylesheet" href="3.css" />
</head>
<body>
<script src="3.js"></script>
<script>
let dialog = new ConfirmDialog({
title: "标题",
content: "内容",
});
</script>
</body>
</html>
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class Dialog{
constructor(options) {
this.title = options.title||'标题';
this.content = options.content||'内容';
this.onConfirm = options.onConfirm||this.hide;
this.onCancel = options.onCancel||this.hide;
this.init();
this.initEventHandler();
}
init() {
this.panel=document.createElement('div');
this.panel.className='dialog';
this.titleP=document.createElement('p');
this.titleP.innerHTML=this.title;
this.panel.appendChild(this.titleP);
this.contentP=document.createElement('p');
this.contentP.innerHTML=this.content;
this.panel.appendChild(this.contentP);
this.confirmBtn=document.createElement('button');
this.confirmBtn.className='button confirm-button';
this.confirmBtn.innerHTML='确定';
this.panel.appendChild(this.confirmBtn);
this.cancelBtn=document.createElement('button');
this.cancelBtn.className='button cancel-button';
this.cancelBtn.innerHTML='取消';
this.panel.appendChild(this.cancelBtn);
document.body.appendChild(this.panel);
}
inithttp://image.bubuko.com/info/201807/20180712173511381297.pngntListener('click',() => {
this.onConfirm();
this.hide();
});
this.cancelBtn.addEventListener('click',() => {
this.onCancel();
this.hide();
});
}
show() {
this.panel.style.display='block';
}
hide() {
this.panel.style.display='none';
}
}
class ContentDialog extends Dialog{
init() {
super.init();
this.titleP.parentNode.removeChild(this.titleP);
}
}
class ConfirmDialog extends Dialog{
init() {
super.init();
this.cancelBtn.parentNode.removeChild(this.cancelBtn);
}
}
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.dialog{
width:400px;
height:300px;
position: absolute;
padding:20px;
top:50%;
left:50%;
margin-left:-200px;
margin-top:-150px;
border:1px solid#000;
background-color: #EEE;
border-radius: 5px;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
.dialog button{
width:100px;
height:30px;
position: absolute;
border: none;
outline: none;
}
.dialog .confirm-button {
right:140px;
bottom:20px;
}
.dialog .cancel-button {
right:20px;
bottom:20px;
}
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