Нашел метод в watch Vue.js

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stringInput (newVal, oldVal) {
  // todo: adjust timing
  // console.log('new:' + newVal)
  // console.log('old:' + oldVal)
  switch (newVal) {
    // services
    case 'Our Services':
      this.selected = 0
      break
    // projects
    case 'Projects':
      this.selected = 1
      break
    // team
    case 'Team Members':
      this.selected = 2
      break
    // pricing
    case 'Pricing':
      this.selected = 3
      break
    // else
    default:
      this.selected = 0
      break
  }
  this.showChange(this.selected)
}