vue2 watch code example

Example 1: vue computed

var vm = new Vue({
  el: '#example',
  data: {
    message: 'Hello'
  },
  computed: {
    // a computed getter
    reversedMessage: function () {
      // `this` points to the vm instance
      return this.message.split('').reverse().join('')
    }
  }
})

Example 2: vue watch

// in component
methods: {
  reverseMessage: function () {
    return this.message.split('').reverse().join('')
  }
}