Vue filters过滤器的使用方法

<div id="app">
  {{message | filters2| filters3(true,priceCount)}}
</div>

var app = new Vue({
  el: "#app",
  data: {
    message: 199,
    priceCount:.8
  },
  filters:{
    filters2:function (arg) {
      console.log("arg:"+arg)
      if(arg>100){
        return arg-8;
      }else {
        return arg;
      }
    },
    filters3:function (arg_1,arg_2,arg_3) {
      var result;
      console.log("arg_1:"+arg_1)
      console.log("arg_2:"+arg_2)
      console.log("arg_3:"+arg_3)
      if(arg_2){
        result = arg_1arg_3;
        console.log("result"+result);
        return result;
      }else{
        result =arg_1;
        console.log("result"+result);
        return result
      }

    }
  }
});