!DOCTYPE htmlhtml head meta charset=UTF-8 titletitle head body script class Father constructor thisx=x; thisy=y; sum consolelogthisx+thisy class Son extends Father c

日期: 2024-12-23

标签: 科技

<p>代码没有明显的语法错误，但是在Father类的构造函数中，this.x和this.y是没有被定义的。也就是说，构造函数应该接收x和y作为参数，并将它们赋值给this.x和this.y。修改后的代码如下：</p>
<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			class Father{
			constructor(x, y){
				this.x = x;
				this.y = y;
			}
<pre><code>		sum(){
			console.log(this.x + this.y)
		}
		}
		class Son extends Father{
			constructor(x, y){
</code></pre>
<p>//					this.x=x;
//					this.y=y;
//					调用父类的构造方法,将参数x,y传给了父类的constructor
super(x, y)
}
}</p>
<pre><code>		var son = new Son(1, 2);
		son.sum();
		
	&lt;/script&gt;
&lt;/body&gt;
</code></pre>
</html

!DOCTYPE htmlhtml head meta charset=UTF-8 titletitle head body script class Father constructor thisx=x; thisy=y; sum consolelogthisx+thisy class Son extends Father c

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