<!DOCTYPE html>
<html>
    <head>
        <meta charset=utf-8>
    </head>
    <body>
    	
        <script type="text/javascript">
            class Rectangle {
                // 补全代码
                constructor(height,width){
                    this.height = height;
                    this.width = width;
                    this.area = height * width;
                }
                
            }
        </script>
    </body>
</html>