<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>

<div id="app">

  {{ message | capitalize('!',label,1<2?true:false) | capitalize2}}

</div>

new Vue({

  el: '#app',

  data: {

    message: 'runcodex',

     label:'———'

  },

  filters: {

    capitalize: function (value,value2,value3,value4) {

      if (!value) return ''

      value = value.toString()

        console.log('capitalize1调用');

      return value.charAt(0).toUpperCase() + value.slice(1)+value2+value3+value4;

    },

       capitalize2: function (value) {

      if (!value) return ''

      value = value.toString()

           console.log('capitalize2调用');

      return value.charAt(0)+value.charAt(1).toUpperCase() + value.slice(2);

    }

  }

})