JS高精度加减乘除

高精度加减乘除

• 加法

  function accAdd(arg1, arg2) {
      var r1, r2, max;
      try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
      try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
      max = Math.pow(10, Math.max(r1, r2))
      return (arg1 * max + arg2 * max) / max
  }

   

• 减法

  function accSub(arg1, arg2) {
      var r1, r2, max, min;
      try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
      try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
      max = Math.pow(10, Math.max(r1, r2));
      //动态控制精度长度
      min = (r1 >= r2) ? r1 : r2;
      return ((arg1 * max - arg2 * max) / max).toFixed(min)
  }

   

 

• 乘法

function accMul(arg1, arg2) {
    var max = 0, s1 = arg1.toString(), s2 = arg2.toString();
    try { max += s1.split(".")[1].length } catch (e) { }
    try { max += s2.split(".")[1].length } catch (e) { }
    return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, max)
}

• 除法

  function accDiv(arg1, arg2) {
      var t1 = 0, t2 = 0, r1, r2;
      try { t1 = arg1.toString().split(".")[1].length } catch (e) { }
      try { t2 = arg2.toString().split(".")[1].length } catch (e) { }
      with (Math) {
          r1 = Number(arg1.toString().replace(".", ""))
          r2 = Number(arg2.toString().replace(".", ""))
          return (r1 / r2) * pow(10, t2 - t1)
      }
  }