1.价格、金额
let reg = /((^[1-9]\d*)|^0)(\.\d{0,2}){0,1}$/
2.正整数和0
let reg = /^(0|\+?[1-9][0-9]*)$/
3.0-100的整数(包括0和100)
let percent = /^(?:[1-9]?\d|100)$/