u-input输入小数限制只输入两位小数并且失去焦点自动补零

html

<u-form-item label="资产原值" prop="price" borderBottom>
    <u--input border="none" 
        type="digit" @blur="priceBlur" 
       :maxlength="maxlength" 
       v-model="dataForm.price" 
       placeholder="请输入资产原值">
     </u--input>
</u-form-item>

js中
写一个watch监听

watch: {
        'dataForm.price': {
            handler(val) {
                if (!val) return;
                if (val.includes('.')) {
                    //小数点后的位数
                    let numAfterDot = val.toString().split('.')[1].length;
                    //小数点前的位数
                    let numBeforeDot = val.toString().split('.')[0].length;
                    //最大长度等于小数点前的位数+3（小数点加小数点后两位）
                    this.maxlength = numBeforeDot + 3;
                    //小数点后的位数大于2，截取
                    if (numAfterDot > 2) {
                        this.dataForm.price = val.substr(0, numBeforeDot + 3);
                    }
                } else {
                    //没有小数点不限制输入大小
                    this.maxlength = -1;
                }
            },
            // 这个属性一定要加
            immediate: true
        }
    },

        //输入框失去焦点时触发
        priceBlur() {
            let val = this.dataForm.price;
            console.log(val);
            if (!val.includes('.')) {
                this.dataForm.price += '.00';
            } else if (val.includes('.')) {
                let numDian = val.toString().split('.')[1].length;
                if (numDian === 1) {
                    this.dataForm.price += '0';
                }
            }
        },