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JavaScript’s sharing of recursive traversal and non-recursive traversal algorithms for multi-trees

小云云Original: 2018-05-16 16:42:362685browse

This article mainly introduces the recursive traversal and non-recursive traversal algorithms of multi-trees implemented in JavaScript. It also analyzes in detail the recursive and non-recursive traversal techniques of JavaScript multi-trees for json nodes in the form of examples. Friends who need it can For reference, I hope it can help everyone.

Preparation work before the demonstration

File structure of the demonstration project:

index.html
jsonData.js
recurrenceTree.js
noRecurrenceTree.js

Explain each file:

index.html is the HTML used for demonstration document.
jsonData.js stores the JSON data of multi-tree.
recurrenceTree.js Recursive algorithm traverses the tree.
noRecurrenceTree.js Non-recursive algorithm for tree traversal.

jsonData.js

/**
 * 用于演示的 JSON 树形数据结构
 */
var root = {
  name:&#39;D盘&#39;,
  children:[
    {
      name:&#39;学习&#39;,
      children:[
        {
          name:&#39;电子书&#39;,
          children:[
            {
              name:&#39;文学&#39;,
              children:[
                {
                  name:&#39;茶馆&#39;
                },
                {
                 name:&#39;红与黑&#39;
                }
              ]
            }
          ]
        }
      ]
    },
    {
      name:&#39;电影&#39;,
      children:[
        {
          name:&#39;美国电影&#39;
        },
        {
          name:&#39;日本电影&#39;
        }
      ]
    }
  ]
}

index.html

<!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>

Recursive traversal

recurrenceTree.js

// 遍历单个节点
function traverseNode(node){
  var pObj = document.getElementById("app");
  pObj.innerHTML = pObj.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);

Non-recursive traversal

##noRecurrenceTree.js

// 遍历单个节点
function traverseNode2(node){
  var pObj2 = document.getElementById("app2");
  pObj2.innerHTML = pObj2.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);

Native test effect:

Related recommendations:

About non-recursive traversal example code sharing of binary trees

php uses recursive traversal to specify a folder File implementation method within the specified folder

PHP recursively traverses the file implementation method within the specified folder

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