console.log问题，交换二叉树左右节点，交换前后输出相同结果

Question

代码如下：

class Tree {

    constructor(left=null, right=null){

        this.v = id++;

        this.left = left;

        this.right = right;

    }

    switch() {

        if(null != this.left || null != this.right){

            let temp = this.right;

            this.right = this.left;

            this.left = temp;

        }

        if (null != this.left) {

            this.left.switch();

        }

        if (null != this.right) {

            this.right.switch();

        }

    }

}

var id = 0;

var A = new Tree();

var B = new Tree();

var C = new Tree(A, B);

var D = new Tree();

var E = new Tree(D);

var F = new Tree(C, E);

console.log(F);

F.switch();

console.log(F);

控制台为什么都输出交换后的结果？求解

Answer 1

应该是你看错了…… 你用 console.log(JSON.stringify(F)); 看看