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，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;
}

希望本文所述对大家JavaScript程序设计有所帮助。