JavaScript树的深度优先遍历和广度优先遍历算法示例

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：

```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;
}

```