js Cannot read properties of undefined (reading 'yearMouth')

出现"Cannot read properties of undefined"的错误通常是因为在访问一个未定义或未声明的变量或属性。根据引用和引用的内容，你可以按照以下两个步骤来解决这个问题：

1. 检查变量或属性的定义：确保要访问的变量或属性已经被正确地定义或声明。你可以检查代码中是否有拼写错误、是否正确导入了相关的库文件等。

2. 确定变量或属性所属的对象：根据引用的内容，当出现"Cannot read properties of undefined"错误时，你需要找到变量或属性所属的对象。你可以通过查看代码逻辑或使用调试工具来确定该对象。

如果你提供更多关于具体错误的上下文和代码片段，我可以给出更具体的解决方案。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [Cannot read properties of undefined (reading ‘resetFields‘)](https://blog.csdn.net/weixin_48616345/article/details/127932752)[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_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *2* [调试错误：Cannot read properties of undefined (reading ‘name‘)](https://blog.csdn.net/weixin_44475738/article/details/131201264)[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_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
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