Question

我是编程新手。我下面的javascript代码没有将我的area值渲染为4，因为我没有声明相同的值。有人请告诉我应该在哪里声明height和width的值？

class polygon {
    constructor(){
        this.name= "polygon";
        
    }
}

var object= new polygon();
console.log(object.name);

class square extends polygon {
    constructor(length) {

      super(length,length);
      
      this.name = 'Square';
     }
  
    get area() {
      return this.height * this.width;
    }
  
    set area(value) {
      this.value = area;
    } 
  }

  var obj= new square();
  var x = new area(2,2);
  console.log(obj.name);
  console.log(x);

Answer 1

尝试一下。如果要将高度和宽度作为单独的变量，则应将其包括在多边形中，并为正方形分配相同的高度和宽度。

class polygon {
  constructor(height, width) {
    this.name = "polygon";
    this.height = height;
    this.width = width;
  }
}

var object = new polygon();
console.log(object.name);

class square extends polygon {
  constructor(length) {
    super(length, length);

    this.name = "Square";
  }

  get area() {
    return this.height * this.width;
  }

  set area(value) {
    this.value = area;
  }
}

var obj = new square();
var x = new square(2);
console.log(x.name);
console.log(x.area);

我应该如何传递派生类的值？

1 个答案: