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JavaScript recursive traversal and non-recursive traversal

亚连Original: 2018-06-07 10:47:093691browse

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 Refer to the following

The example of this article describes the implementation of recursive traversal and non-recursive traversal algorithm operations of multi-tree in JavaScript. Share it with everyone for your reference, the details are as follows:

Preparation work before demonstration

File structure of the demonstration project:

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

Explain each file:

index.html is the HTML file used for demonstration.
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:

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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