1. // 树的结构
    2.         class TreeNode{
    3.             constructor(value){
    4.                 this.left = null
    5.                 this.right = null
    6.                 this.value = value
    7.             }
    8.         }
    10.         function reverseBTree(node) {
    11.             if(!node){
    12.                 return
    13.             }
    14.             const tmp = node.left
    15.             node.left = node.right
    16.             node.right = tmp
    17.             reverseBTree(node.left)
    18.             reverseBTree(node.right)
    19.         }