小程序数字输入框 正则验证，充值金额小数点后不能大于两位数字

import { validInputNumber } from "../../../utils/util.js"

// 分油码分配金额改变

  bindKeyInput (e) {

    this.setData({

      amountInput: validInputNumber(e.detail.value)

    })

  }

utils/util.js

// 输入框允许输入
export const validInputNumber = (num) => {
  num === undefined && (num = '')
  if (/^(\d?)+(\.\d{0,2})?$/.test(num)) { //正则验证，充值金额小数点后不能大于两位数字
    return num
  } else {
    let str1 = num.replace(/[^\d^\.]+/g, '');
    let str2 = str1.split(".");
    let str3 = '';
    if (str2.length > 1) {
      str3 = str2[1].substring(0, str2[1].length > 2 ? 2 : str2[1].length);
      return str2[0] + (str2[1].length ? "." + str3 : "")
    } else {
      return str2[0]
    }
  }
}
module.exports = {
  validInputNumber
}