const MoneyTest = /((^[1-9]\d*)|^0)(\.\d{0,2}){0,1}$/;
// 金額添加千分位
const comdify = function (n) {
  if(!n) return n;
  let str = n.split('.');
  let re = /\d{1,3}(?=(\d{3})+$)/g;
  let n1 = str[0].replace(re, "$&,");
  return str.length > 1 && str[1] ? `${n1}.${str[1]}` : `${n1}.00`;
};
//去除千分位中的‘，'
const delcommafy = function (num){
  if(!num) return num;
  num = num.toString();
  num = num.replace(/,/gi, '');
  return num;
};
const valdateFn = function (rule,val,cb) {
  setTimeout(() => {
    if(val) {
      let inputVal = delcommafy(val);
      if (rule.test(inputVal)) {
        cb()
      } else {
        cb('只能是數(shù)字金額,最多兩位小數(shù)')
      }
    }
    cb()
  })
}
// 驗證金額數(shù)字可以為負數(shù)
const moneyValid = function (rule,val,cb) {
  valdateFn(/((^-?[1-9]\d*)|^-?0)(\.\d{0,2}){0,1}$/,val,cb);
};
// 驗證金額數(shù)字不可以為負數(shù)
const moneyNValid = function (rule,val,cb) {
  valdateFn(MoneyTest,val,cb);
};
// 獲取輸入框的值
const getInputValue = function (el) {
  let inputVal = el.target.value || '';
  return comdify(delcommafy(inputVal));
};

<el-input v-model.trim="form.pastAdjustFee" @blur="inputMoney($event,'pastAdjustFee')"></el-input>

data(){
 return {
 form:{
  pastAdjustFee:''
 }
 }
}
methods:{
 inputMoney(el,name) {
     this.form[name] = getInputValue(el);
   }
}