JS |方法 |在第三个函数中添加两个函数的结果 |解决方案？

Question

有人知道如何在一个方法中组合两个函数吗？我想在第三个函数中添加两个不同函数的结果并将其记录到控制台。感谢您的帮助。

function Circle (radius) {
    this.radius = radius;
    this.area = function () {
        return Math.PI * this.radius * this.radius;
        
    };
    // define a perimeter method here
    this.perimeter = function () {
        return 2 * Math.PI * this.radius;
    }
    this.logg = function() {
        return this.perimeter + this.area;
    }
};

var perimeter = new Circle(12);
perimeter.perimeter();
//doesn't work
console.log(perimeter.logg());

Answer 1

您将得到函数的toString 结果的串联。你忘了调用函数 - return this.perimeter() + this.area()

function Circle (radius) {
    this.radius = radius;
    this.area = function () {
        return Math.PI * this.radius * this.radius;
        
    };

    this.perimeter = function () {
        return 2 * Math.PI * this.radius;
    };
    
    this.logg = function() {
        return this.perimeter() + this.area();
    };
};

var perimeter = new Circle(12);
perimeter.perimeter();
//doesn't work
console.log(perimeter.logg());