js 输入数与标准数位数比较补0去0问题

function name(a, b) {
    if (a.indexOf(".") == -1 && b.indexOf(".") == -1) return a
    let c = ""
    a = a.indexOf(".") > -1 ? a : a.padEnd(a.length + 1, '.0')
    c = a.replace(/(0+)$/g, "").padEnd(b.length, '0')
    return c
  }