我使用get方式发送数据给：shouquan.php?username=hzx，帮我修改一下代码：// 根节点ID和名称var rootId = "N000";var rootName = "菜单";// 获取指定节点下的所有子节点function getChildren(nodes, id) { var result = []; for (var i = 0; i < nodes.length; i++) { var node = nodes[i]; if (node.parentIndex === id) { node.children = getChildren(nodes, node.id); result.push(node); } } return result;}// 构建 DOM 树function buildTree(parentNode, children) { for (var i = 0; i < children.length; i++) { var childNode = children[i]; var tr = $('<tr class="treegrid-' + childNode.id + '"><td>' + childNode.name + '</td></tr>'); parentNode.append(tr); if (childNode.children && childNode.children.length > 0) { var subTable = $('<table></table>'); tr.append(subTable); buildTree($('<tbody></tbody>').appendTo(subTable), childNode.children); } }}// 主程序const username = 'hzx=';var xhr = new XMLHttpRequest();xhr.onreadystatechange = function() { if (xhr.readyState == XMLHttpRequest.DONE) { if (xhr.status == 200) { var jsonData = JSON.parse(xhr.responseText); var root = { id: rootId, name: rootName, children: getChildren(jsonData, rootId) }; buildTree($('#tree tbody'), root.children); // 初始化 treegrid $('#tree').treegrid({ expanderExpandedClass: 'glyphicon glyphicon-minus', expanderCollapsedClass: 'glyphicon glyphicon-plus' }); } else { alert("请求失败：" + xhr.statusText); } }};xhr.open("GET", "shouquan.php?username=" + username, true);xhr.send();

您需要将代码中的`username`变量的值改为`hzx`，并将其作为参数拼接在请求的URL中。修改后的代码如下：

// 根节点ID和名称
var rootId = "N000";
var rootName = "菜单";

// 获取指定节点下的所有子节点
function getChildren(nodes, id) {
  var result = [];
  for (var i = 0; i < nodes.length; i++) {
    var node = nodes[i];
    if (node.parentIndex === id) {
      node.children = getChildren(nodes, node.id);
      result.push(node);
    }
  }
  return result;
}

// 构建 DOM 树
function buildTree(parentNode, children) {
  for (var i = 0; i < children.length; i++) {
    var childNode = children[i];
    var tr = $('<tr class="treegrid-' + childNode.id + '"><td>' + childNode.name + '</td></tr>');
    parentNode.append(tr);
    if (childNode.children && childNode.children.length > 0) {
      var subTable = $('<table></table>');
      tr.append(subTable);
      buildTree($('<tbody></tbody>').appendTo(subTable), childNode.children);
    }
  }
}

// 主程序
const username = 'hzx';
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
  if (xhr.readyState == XMLHttpRequest.DONE) {
    if (xhr.status == 200) {
      var jsonData = JSON.parse(xhr.responseText);
      var root = { id: rootId, name: rootName, children: getChildren(jsonData, rootId) };
      buildTree($('#tree tbody'), root.children);
      // 初始化 treegrid
      $('#tree').treegrid({
        expanderExpandedClass: 'glyphicon glyphicon-minus',
        expanderCollapsedClass: 'glyphicon glyphicon-plus'
      });
    } else {
      alert("请求失败：" + xhr.statusText);
    }
  }
};
xhr.open("GET", "shouquan.php?" + username, true);
xhr.send();