[vue3 common error 1] TypeError: Cannot read property 'xxx' of null/undefined

TypeError: Cannot read property ‘xxx’ of null/undefined

This error usually occurs when trying to access a variable that does not exist, is undefined, or is empty.

Workarounds include:

• Verify that variables are declared and initialized correctly.
• Confirm that DOM elements are loaded correctly, and avoid accessing incompletely loaded elements in lifecycle hook functions.