Property or method "articleInfos" is not defined on the instance but referenced during render. Make sure that this property is reactive,

时间: 2023-09-25 07:17:18 浏览: 140

Python中对错误NameError: name ‘xxx’ is not defined进行总结

最近在使用python过重遇到这个问题，NameError: name 'xxx' is not defined，在学习python或者在使用python的过程中这个问题大家肯定都遇到过，在这里我就这个问题总结以下几种情况：错误NameError: name ‘xxx’ is not defined总结情况一：要加双引号（” “）或者（’ ‘）而没加情况二：字符缩进格式的问题情况三：`if __name__==’__main__’ :` 没有和`class类`进行对齐情况四：NameError: name ‘file’ is not defined情况五：NameError: name ‘模在Python编程过程中，遇到`NameError: name 'xxx' is not defined`的错误通常表示尝试访问一个还未定义或未导入的变量、函数、类或模块。这个错误是初学者经常遇到的问题，也是代码调试中常见的障碍。下面我们将针对标题和描述中提到的几个常见情况逐一分析，并提供解决方案。 **情况一：字符串引用错误** 在Python中，字符串需要被单引号 `' '` 或双引号 `"` 包围。如果忘记添加引号，Python将无法识别字符串，导致`NameError`。例如： ```python text = 'Hello, World!' ``` 如果你忘记了引号，就会出现`NameError: name 'Hello, World!' is not defined`。确保所有字符串都被正确地用引号括起来。 **情况二：缩进错误** Python使用缩进来组织代码块，如函数体、循环、条件语句等。如果缩进不正确，Python会无法识别代码块，从而引发`NameError`。例如： ```python def askURL(url): request = urllib.request.Request(url) try: response = urllib.request.urlopen(request) html = response.read() except urllib.error.URLError as e: if hasattr(e, "code"): print(e.code) if hasattr(e, "reason"): print(e.reason) return html ``` 如果缩进不正确，比如`global html`没有正确缩进，那么`html`在函数内部就未定义，会导致`NameError`。 **情况三：`if __name__ == '__main__'` 对齐问题** `if __name__ == '__main__'` 语句用于判断当前脚本是否作为主程序运行。如果它与类定义不在同一缩进级别，可能导致类未被正确定义和执行。正确示例： ```python class MyClass: def method(self): pass if __name__ == '__main__': obj = MyClass() obj.method() ``` 错误的对齐会导致类的方法在`if __name__ == '__main__'`外部无法访问。 **情况四：`file` 函数的使用** 在Python 3中，`file`函数已被`open`函数取代。尝试使用`file()`会引发`NameError`。应该使用`open()`来打开文件： ```python file_name = "./movie.xlsx" with open(file_name, 'wb') as fp: # 文件操作 ``` **情况五：模块导入错误** 当尝试使用未导入的模块时，也会出现`NameError`。确保在使用任何模块之前正确导入： ```python import urllib ``` 如果你的代码中有`urllib`的使用，但未导入，就会看到`NameError: name 'urllib' is not defined`。 **情况六：全局变量的使用** 如果在函数内部尝试访问未声明的全局变量，也会触发`NameError`。确保在使用全局变量之前正确声明： ```python my_global_var = 5 def my_function(): global my_global_var print(my_global_var) ``` 在函数内部使用全局变量前，需使用`global`关键字声明。 **情况七：两个.py文件间的函数或类调用** 如果你在一个Python文件（模块）中定义了函数或类，并试图在另一个文件中调用它们，必须确保已正确导入： ```python # 在file1.py def my_function(): print("Hello from file1") # 在file2.py import file1 file1.my_function() ``` 确保在调用函数或类之前正确导入相应的模块。理解和解决`NameError: name 'xxx' is not defined`的关键在于检查变量、函数、类和模块的定义、导入以及代码的缩进结构。遵循Python的语法规则，细心检查每个细节，通常可以迅速定位并修复这类错误。

这个错误是由于在渲染期间引用了一个名为"articleInfos"的属性或方法，但是在实例中没有定义它。要解决这个问题，你需要确保在Vue实例的data选项中定义了"articleInfos"属性，并且该属性是响应式的。这样Vue才能正确地检测到该属性的变化并进行重新渲染。如果你正在使用vuex，你还需要确保在store.js中正确地定义了"articleInfos"的状态和相关的mutations或actions。如果你正在使用类组件，你还需要在类中初始化该属性。123 #### 引用[.reference_title] - *1* *2* *3* [vuex报错：Property or method “$store“ is not defined on the instance but referenced during render....](https://blog.csdn.net/qq_46199553/article/details/127645971)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 100%"] [ .reference_list ]

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Property or method "articleInfos" is not defined on the instance but referenced during render. Make sure that this property is reactive,

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