Uncaught (in promise) TypeError: undefined has no properties

这个错误通常发生在使用Promise时，当Promise被拒绝(reject)时，没有正确处理错误导致的。具体来说，当Promise被拒绝时，如果没有使用.catch()方法来捕获错误，那么就会出现"Uncaught (in promise) TypeError: undefined has no properties"的错误。

以下是一个示例代码，演示了如何正确处理Promise的拒绝(reject)错误：

new Promise((resolve, reject) => {
  reject(new TypeError("undefined has no properties"));
}).then(res => {
  // 处理Promise的解决(resolve)结果
}).catch(err => {
  console.error(err); // 输出错误信息
});

在上面的代码中，我们使用了.catch()方法来捕获Promise的拒绝错误，并输出错误信息。这样就可以避免出现"Uncaught (in promise) TypeError: undefined has no properties"的错误。

相关问题

Uncaught (in promise) TypeError: Cannot set properties of undefined (setting 'initiaValue')

This error is indicating that you are trying to set a property called 'initiaValue' on an undefined object. This could happen if you are trying to access an object that has not been initialized or created yet.

To fix this error, you should first make sure that the object you are trying to access exists and has been properly initialized. You may also want to check the spelling of the property you are trying to set, as a typo could also cause this error.

Once you have identified the issue, you can update your code to properly initialize the object or correct any typos.

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'langs')

This error is occurring because you are trying to access the 'langs' property of an undefined variable or object.

To fix this error, you need to make sure that the variable or object you are trying to access has been properly defined and initialized before trying to access its properties.

You may want to check if the variable or object is null or undefined before trying to access its properties. You can use conditional statements to handle this case, such as:

if (myVar !== undefined && myVar.langs !== undefined) {
// access the 'langs' property
} else {
// handle the case where the variable or property is undefined
}