JavaScript实现多叉树的递归与非递归遍历详解

递归遍历实现

/**
 * 用于演示的 JSON 树形数据结构
 */
var root = {
  name:'D盘',
  children:[
    {
      name:'学习',
      children:[
        {
          name:'电子书',
          children:[
            {
              name:'文学',
              children:[
                {
                  name:'茶馆'
                },
                {
                 name:'红与黑'
                }
              ]
            }
          ]
        }
      ]
    },
    {
      name:'电影',
      children:[
        {
          name:'美国电影'
        },
        {
          name:'日本电影'
        }
      ]
    }
  ]
}

<!DOCTYPE html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta name="renderer" content="webkit"/>
  <meta http-equiv="x-ua-compatible" content="ie=edge, chrome=1">
  <meta http-equiv="Cache-Control" content="max-age: 31536000">
  <title>www.jb51.net js多叉树遍历</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
  <meta name="wap-font-scale" content="no">
  <meta name="author" content="">
  <meta name="keywords" content="">
  <meta name="description" content="">
  <script type="text/javascript" src="jsonData.js"></script>
 </head>
 <body>
  递归遍历：<span id="app"></span>
  <script type="text/javascript" src="recurrenceTree.js"></script>
  <hr>
  非递归遍历：<span id="app2"></span>
  <script type="text/javascript" src="noRecurrenceTree.js"></script>
 </body>
</html>

非递归遍历实现

// 遍历单个节点
function traverseNode(node){
  var divObj = document.getElementById("app");
  divObj.innerHTML = divObj.innerHTML + " " + node.name;
}
// 递归遍历树
// 作者：张超
function traverseTree(node){
  if (!node) {
    return;
  }
  traverseNode(node);
  if (node.children && node.children.length > 0) {
    var i = 0;
    for (i = 0; i < node.children.length; i++) {
      this.traverseTree(node.children[i]);
    }
  }
}
traverseTree(root);

// 遍历单个节点
function traverseNode2(node){
  var divObj2 = document.getElementById("app2");
  divObj2.innerHTML = divObj2.innerHTML + " " + node.name;
}
// 非递归遍历树
// 作者：张超
function traverseTree2(node){
  if (!node) {
    return;
  }
  var stack = [];
  stack.push(node);
  var tmpNode;
  while (stack.length > 0) {
    tmpNode = stack.pop();
    traverseNode2(tmpNode);
    if (tmpNode.children && tmpNode.children.length > 0) {
      var i = tmpNode.children.length - 1;
      for (i = tmpNode.children.length - 1; i >= 0; i--) {
        stack.push(tmpNode.children[i]);
      }
    }
  }
}
traverseTree2(root);