javascript - Two-way binding problem of vue dynamic data

Question

Form form two-way binding problem, the object defined in my data is dynamically generated,

in the form form

This is not possible for two-way binding

This definition is okay. What is the reason?
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Answer 1

理解下官网文档中这句话Link description

Since Vue will perform the getter/setter conversion process on the attribute when initializing the instance, the attribute must exist on the data object in order for Vue to convert it, so that it can be responsive