element el-input directive数字进行控制

<tr v-for="(item,index) in form.valuation_rules" :key="index">  
  <td class="center" >    
   <el-input v-if="form.valuation_type==1" v-numberInt:0="item.first_fee" v-model.trim="item.first_amount"></el-input>  
   <el-input v-else v-model.trim="item.first_amount" v-numberInt:2="item.first_fee"></el-input>  
  </td>   
  <td class="center"> 
   <el-input v-model.trim="item.first_fee" v-numberInt:2="item.first_fee"></el-input>   </td>  
  <td class="center"> {{item.additional_amount}} 
  </td> 
  <td class="center">  
   <el-input v-model.trim="item.additional_fee" v-numberInt:2="item.additional_fee"></el-input>
  </td>
 </tr>

Vue.directive('numberInt', { bind: function(el, binding, vnode) { 
  const element = el.getElementsByTagName('input')[0] 
  const len = binding.arg  // 初始化设置 
  element.value = Number(element.value ).toFixed(len)  // 失焦时候格式化
  element.addEventListener('blur', function() { 
  if (isNaN(element.value)) {   
    vnode.data.model.callback(0)  
   } else {   
    vnode.data.model.callback(Number(element.value).toFixed(len)) 
   }  
   }) 
 }})