<template>
  <view>
    <p>message: {{message}}</p>
    <p>message: {{reversedMessage}}</p>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        message: 'Hello'
      };
    },
    computed: {
      reversedMessage: function() {
        return this.message.split('').reverse().join('')
      }
    }
  }
</script>

Vue-computed_sed

Vue-computed_sed_02

参考：​​计算属性和侦听器​​