The best practice for InpuNumber in iView to limit decimal places, others are rubbish

Problem scenario:

• After setting the precision of the InputNumber component , each input will automatically fill in and cause the cursor to move back, affecting the input experience.

//步骤一
<FormItem prop="hitThreshold" label="命中率阈值">
    <InputNumber 
     ref="number" 
     v-model="modalForm.hitThreshold" 
     :formatter="formatter" 
     :min="0" 
     placeholder="命中率阈值"/>
</FormItem>

//步骤三（工具函数）
const formatter=(VauleNumber,length=3)=>{
  let newNumber= null;
  if(!isNaN(VauleNumber)){
    if (VauleNumber >= 0) {
      let reg = /.*\..*/
      if (reg.test(VauleNumber)&&String(VauleNumber).split(".")[1].length>length) {
        newNumber= parseFloat(VauleNumber).toFixed(length)
      } else {
        newNumber= VauleNumber
      }
    }
    return newNumber
  }
  return 0
}


//步骤二
data() {
    return {
      modalForm:{hitThreshold:null},
      modalRule:{...自己表单字段}
    };
  },
 mounted(){
    //重置掉当前组件的函数
    this.$refs.number.setValue=function(val){
      this.$nextTick(() => {
        this.currentValue = val;
        this.$emit('input', val);
        this.$emit('on-change', val);
        this.dispatch('FormItem', 'on-form-change', val);
      });
    }
  },
  methods: {
    formatter(VauleNumber){
      return formatter(VauleNumber,2);
    }
  }