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