javascript object 文字 — 公式

Question

I'm supposed to declare an object literal, accepting a parameter that gets the radius of the circle. Then returns the area of the circle. Not sure how to implement the formula A = PIr^2 This is what I have so far. Am I in the right direction?

Answer 1

I am not sure why you have the a and b property. What is its purpose? Do you want something like this?

 var MathUtility = { getAreaOfCirlceForRadius: function(radius) { return Math.PI * radius * radius; }, getRadiusOfCircleForArea: function(area) { return Math.sqrt(area / Math.PI); } }; console.log(MathUtility.getRadiusOfCircleForArea(12.566370614359172)); console.log(MathUtility.getAreaOfCirlceForRadius(2));