angular 7 TypeError:无法读取未定义的属性'hasOwnProperty‘

Angular 7 TypeError: Cannot read property 'hasOwnProperty' is a common error in Angular applications. It occurs when you try to access the 'hasOwnProperty' property of an undefined object. This error usually indicates that you are trying to access a property of an object that does not exist or is not defined.

To fix this error, you need to identify the source of the undefined object and ensure that it is properly initialized or defined before accessing its properties. Here are some steps you can follow to troubleshoot and resolve this issue:

1. Check the code where the error is occurring: Look for the line of code where the error is being thrown. This will help you identify the object that is causing the issue.
2. Verify object initialization: Make sure that the object you are trying to access is properly initialized. Check if it is assigned a value or if it is null or undefined.
3. Use conditional checks: Before accessing any property of an object, use conditional checks to ensure that the object exists and is not null or undefined. You can use the 'if' statement or the optional chaining operator (?.) to perform these checks.
4. Debugging: Use the browser's developer tools or a debugging tool to step through your code and track the values of variables and objects. This will help you identify where the object is becoming undefined.
5. Review your code logic: Double-check your code logic to ensure that you are correctly handling object initialization and property access. Make sure you are not assuming the existence of an object without proper validation.

In terms of recommended Tencent Cloud products related to Angular 7 development, you can consider using the following:

1. Tencent Cloud Serverless Cloud Function (SCF): SCF allows you to run your Angular 7 application in a serverless environment, providing automatic scaling and high availability. You can find more information about SCF here.
2. Tencent Cloud COS (Cloud Object Storage): COS provides scalable and secure object storage for your Angular 7 application's static assets, such as images, videos, and files. You can learn more about COS here.

Remember to adapt these recommendations to your specific requirements and consult the official Tencent Cloud documentation for detailed usage instructions.