index.vue?9cc6:353 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'row')

This error occurs when the code is trying to access the 'row' property of an undefined object. This can happen if the object has not been properly initialized or if the code is trying to access an object that does not exist. To fix this error, you need to ensure that the object is properly initialized and that all necessary properties are defined. You can also add error handling code to catch any potential errors and prevent the code from crashing.

相关问题

FirstPage.vue?597e:115 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'dateTime')

这段错误信息 `Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'dateTime')` 是在前端JavaScript开发中常见的运行时错误，通常发生在使用Vue.js框架的项目中。错误指出在执行一个Promise时，尝试访问一个未定义（undefined）对象的`dateTime`属性，这导致了类型错误（TypeError）。

错误发生在`FirstPage.vue`的第115行。在JavaScript中，`Promise`对象用于表示异步操作的最终完成（或失败）及其结果值。当Promise被拒绝（rejected）时，会抛出一个错误，如果这个错误没有被捕获处理，就会显示为“Uncaught (in promise)”。

这个问题通常发生的原因有：
1. 试图访问一个可能未被初始化或赋值为`null`的对象的属性。
2. 在数据获取之前就尝试访问了数据，例如在异步操作（如API调用）还未完成时就尝试访问返回的数据。

解决这类问题的方法包括：
1. 检查`dateTime`属性所属的对象是否在访问之前已经确保定义并且不是`undefined`。
2. 在访问`dateTime`属性之前，使用条件语句（如`if`）检查该对象是否存在。
3. 使用`try...catch`语句捕获并处理Promise的拒绝，防止错误冒泡到全局。

index.vue?400f:878 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'code')

This error means that you are trying to access a property called 'code' on an object that is undefined. This can happen if you are trying to access a property of an object before it has been properly initialized, or if the object was not created at all.

To fix this error, you should check that the object exists before trying to access its properties. You can do this using an if statement or the optional chaining operator (?.). For example:

if (myObject && myObject.code) {
// do something with myObject.code
}

// or

const code = myObject?.code;
if (code) {
// do something with code
}

By doing this, you can avoid trying to access properties on undefined objects and prevent this type of error from occurring.