[Vue]”TypeError: Cannot read property ‘0’ of undefined

This error occurred because Vue rendered the DOM before retrieving the data

For example, < div > {{formList. Name [0]}} < div >

This error is reported when no data is requested, and can be resolved by adding a judgment using V-if

<div v-if='{{formList.name[0]}}'>{{formList.name[0]}}<div>

Or use timer wrapping when requesting data in Mounted