Javascript TypeError:无法读取属性'；名称'；node.js中未定义的

您的循环中有几个问题：

D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:132
  throw err;
  ^

TypeError: Cannot read property 'name' of undefined
at getPaths (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\routes.js:124:54)
at D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\routes.js:24:4
at D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\routes.js:112:3
at result (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:414:17)
at executeCallback (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:406:9)
at handleCallback (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:128:55)
at cursor.close (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\operations\cursor_ops.js:218:62)
at handleCallback (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:128:55)
at completeClose (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\cursor.js:887:14)
at _endSession (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\cursor.js:898:37)

---

你确定不想比较它们吗？因为现在，您正在设置category.id并在函数中返回它。因此，如果

pathIds[i]

等于0，则提供给

find

的函数将返回false，否则返回true。这真的是你想要的吗

您有一个循环，只打印

currentCategory

的第一个值。它是在循环中修改的，所以将console.log移动到那里以查看betterI see now-第一个循环是可以的，但是在该循环之后，代码执行会变得异步。有没有一种方法可以在接下来的循环中重用currentCategory对象？您能提供更多的代码吗？与使用PathID数组和subCategory对象调用getPaths函数类似，始终存在与条件匹配的元素。这应该不是问题。如果一个类别没有任何子类别怎么办？在这种情况下，find将返回undefined，您将在下一次循环迭代中得到错误。我修复了它。谢谢！！：）循环出现问题，导致未定义的值。

D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:132
  throw err;
  ^

TypeError: Cannot read property 'name' of undefined
at getPaths (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\routes.js:124:54)
at D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\routes.js:24:4
at D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\routes.js:112:3
at result (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:414:17)
at executeCallback (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:406:9)
at handleCallback (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:128:55)
at cursor.close (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\operations\cursor_ops.js:218:62)
at handleCallback (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\utils.js:128:55)
at completeClose (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\cursor.js:887:14)
at _endSession (D:\repos\onlineStore\borrislava-onlinestore\Backup\Work\node_modules\mongodb\lib\cursor.js:898:37)

for (i=0; i<pathIds.length; i++) {
    pathDirs += pathIds[i];
    paths[i] = {dir : pathDirs, name : currentCategory.name};
    currentCategory = currentCategory.categories.find(function(category){
        return category.id = pathIds[i];
    });
}

return category.id = pathIds[i]