object.prototype javascript确实删除了新对象

Question

http://codepen.io/haikudoichi/pen/OPYBQN

Everything seems to be working except for the delete option. When I click on the circle object, I want to be able to delete it. However it's acting funky.

Is this correct?

var sqrt = Math.sqrt((this.x - x)^2 + (this.y - y)^2);

Answer 1

I think you want to do this instead:

var sqrt = Math.sqrt(Math.pow(this.x - x, 2) + Math.pow(this.y - y, 2));

^ is the Bitwise XOR operator.

Answer 2

“ ^ ”不起作用，请尝试以下操作：

var sqrt = Math.sqrt(((this.x - x) * (this.x - x)) + ((this.y - y) * (this.y - y)));