how to implement v-on:change="" ?

[arisdevx]

when i create the new function like checkData() using onChange method, but not effect

[ddlaat]

When looking at the code I see that an event is emitted called input. So you should be able to catch that event by adding this:

<v-select @input="checkData" />

And your checkData() function should look similar to this:

checkData(value) {
    console.log(value)
  }