vue及js递归函数返回递归函数初始值赋值

 let paramPid=''
      function findValueInTree(source: any, callback: (value: any) => void) {
          source.forEach((it: any) => {
            if (it.children && it.children.length > 0) {
              findValueInTree(it.children, callback);
            } else {
              callback(it.value); // 当到达叶子节点时，触发回调并将值传递出去
            }
          });
        }
      findValueInTree(treeSelectData, (value) => {
          paramPid = value;
      });