关于javascript:小程序校验input输入小数点后两位

nameInput(e){
    let nameValue;
    if (/^(\d?)+(\.\d{0,2})?$/.test(e.detail.value)) {nameValue = e.detail.value;} else {nameValue = e.detail.value.substring(0, e.detail.value.length - 1);
    }
    this.setData({nameValue: nameValue})
},