JavaScript树的深度优先遍历和广度优先遍历算法示例

本文实例讲述了JavaScript树的深度优先遍历和广度优先遍历算法。分享给大家供大家参考，

本文实例讲述了JavaScript树的深度优先遍历和广度优先遍历算法。分享给大家供大家参考，具体如下：

1、深度优先遍历的递归写法

function deepTraversal(node) {
 var nodes = [];
 if (node != null) {
 nodes.push(node);
 var children = node.children;
 for (var i = 0; i < children.length; i++)
 deepTraversal(children[i]);
 }
 return nodes;
}

2、深度优先遍历的非递归写法

function deepTraversal(node) {
 var nodes = [];
 if (node != null) {
 var stack = [];
 stack.push(node);
 while (stack.length != 0) {
 var item = stack.pop();
 nodes.push(item);
 var children = item.children;
 for (var i = children.length - 1; i >= 0; i--)
 stack.push(children[i]);
 }
 }
 return nodes;
}

3、广度优先遍历的递归写法：

报错：Maximum call stack size exceeded(…)

function wideTraversal(node) {
 var nodes = [];
 var i = 0;
 if (!(node == null)) {
 nodes.push(node);
 wideTraversal(node.nextElementSibling);
 node = nodes[i++];
 wideTraversal(node.firstElementChild);
 }
 return nodes;
}

4、广度优先遍历的非递归写法

function wideTraversal(selectNode) {
 var nodes = [];
 if (selectNode != null) {
 var queue = [];
 queue.unshift(selectNode);
 while (queue.length != 0) {
 var item = queue.shift();
 nodes.push(item);
 var children = item.children;
 for (var i = 0; i < children.length; i++)
 queue.push(children[i]);
 }
 }
 return nodes;
}