<input @keyup="getNumber($event)" v-model="balance_amount" placeholder="请输入余额"/>
getNumber(e){
let value = e.target.value;
let num = value.match(/\d+(\.\d{0,2})?/)? value.match(/\d+(\.\d{0,2})?/)[0]: '';
this.balance_amount = num;
},
<input @keyup="getNumber($event)" v-model="balance_amount" placeholder="请输入余额"/>
getNumber(e){
let value = e.target.value;
let num = value.match(/\d+(\.\d{0,2})?/)? value.match(/\d+(\.\d{0,2})?/)[0]: '';
this.balance_amount = num;
},