SOURCE

Vue.filter('meter',function(val,unit){
  val=val || 0;
  unit=unit || 'm';
 return (val/1000).toFixed(2) + unit;
})

Vue.filter('currency',function(val,unit){
  val=val || 0;
  unit=unit || '元';
 return val + unit;
})

new Vue({
  el: '#app',
  data: {
    price: 10,
    length: 10
  }
});

<div id="app">
  <div>
    <input type="text" v-model="length" />mm 
    <p>{{length | meter('m')}}</p>
  </div>
  <input type="text" v-model="price" />{{price | currency('元')}}
</div>