Vue 银行卡限制输入

<el-input v-model="form.bankCard" type="text" style="width: 400px;" placeholder="请输入银行卡账号" :maxlength="23"></el-input>

watch实时监控

watch: {
        ['form.bankCard'](val) {
            this.$nextTick(() => {
                this.form.bankCard = val.replace(/\D/g,'').replace(/....(?!$)/g,'$& ');
            });
        }
    }