菜鸟教程在线编辑器

AI 编程工具
 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<h2>JavaScript 类继承</h2>

<p>JavaScript 类继承使用 extends 关键字。</p>
<p>"super" 方法用于调用父类的静态方法。</p>

<p id="demo"></p>
<p id="demo2"></p>
<script>
class Rectangle {
  constructor() {}
  static logNbSides() {
    return 'I have 4 sides';
  }
}
 
class Square extends Rectangle {
  constructor() {}
  static logDescription() {
    return super.logNbSides() + ' which are all equal';
  }
}

document.getElementById("demo").innerHTML = Square.logDescription(); // 'I have 4 sides which are all equal'
</script>

</body>
</html>
              