How to fix the error of hasOwnProperty in JavaScript?

In JavaScript, hasOwnProperty is a prototype method of an object used to determine if the object contains a specific property (excluding properties on the prototype chain). It is important to make sure the object calling this method is a valid object.

If an error occurs when calling the hasOwnProperty method, it may be because the object calling the method is not a valid object or the object does not exist. In this situation, the issue can be resolved by:

1. possesses a property
2. What type of.
3. There is no response required.
4. There is no specific definition for that.

if (typeof obj === 'object' && obj !== null) {
    // 调用 hasOwnProperty 方法
} else {
    console.error('对象无效');
}

1. owns Property
2. Does the object contain property?
3. “Object”
4. property

const obj = { key: 'value' };
if (obj.hasOwnProperty('key')) {
    console.log('对象包含属性 key');
} else {
    console.log('对象不包含属性 key');
}

By following the methods mentioned above, it ensures the correct usage of the hasOwnProperty method and prevents any errors from occurring. If the issue persists, please examine other parts of the code to pinpoint the cause of the error.