Edit in JSFiddle

  const vm = new Vue({el: "#app", data: {a: null}})
  vm.a = 1
<div id='app'>
  <div class='form-horizontal'>
    <div class='form-group'>
      <div class='col-md-12'>
        <input class='form-control' v-model='a'>
      </div>
    </div>
    <div class='form-group'>
      <div class='col-md-12'>
        <label class='radio-inline'><input type='radio' v-model='a' value='1'>壱
        </label>
        <label class='radio-inline'><input type='radio' v-model='a' value='2'>弐
        </label>
        <label class='radio-inline'><input type='radio' v-model='a' value='3'>参
        </label>
      </div>
    </div>
    <div class='form-group'>
      <div class='col-md-12'>
        <input max='3' min='1' type='range' v-model='a'>
      </div>
    </div>
    <div class='form-group'>
      <div class='col-md-12'>
        <input false-value='1' true-value='2' type='checkbox' v-model='a'>
      </div>
    </div>
    <div class='form-group'>
      <div class='col-md-12'>
        <textarea class='form-control' v-model='a'>
          
        </textarea>
      </div>
    </div>
    <div class='form-group'>
      <div class='col-md-12'>
        <p class='form-control-static'>
          {{a}}
        </p>
      </div>
  </div>
</div>