解决js计算0.1时不准确问题

const compute = {
  // 加法运算
  accAdd(arg1, arg2) {
    let r1;
    let r2;
    let m;
    let c;
    try {
      r1 = arg1.toString().split('.')[1].length;
    } catch (e) {
      r1 = 0;
    }
    try {
      r2 = arg2.toString().split('.')[1].length;
    } catch (e) {
      r2 = 0;
    }
    c = Math.abs(r1 - r2);
    m = 10 ** Math.max(r1, r2);
    if (c > 0) {
      let cm = 10 ** c;
      if (r1 > r2) {
        arg1 = Number(arg1.toString().replace('.', ''));
        arg2 = Number(arg2.toString().replace('.', '')) * cm;
      } else {
        arg1 = Number(arg1.toString().replace('.', '')) * cm;
        arg2 = Number(arg2.toString().replace('.', ''));
      }
    } else {
      arg1 = Number(arg1.toString().replace('.', ''));
      arg2 = Number(arg2.toString().replace('.', ''));
    }
    return (arg1 + arg2) / m;
  },
  // 减法计算
  accSub(arg1, arg2) {
    let r1;
    let r2;
    let m;
    let n;
    try {
      r1 = arg1.toString().split('.')[1].length;
    } catch (e) {
      r1 = 0;
    }
    try {
      r2 = arg2.toString().split('.')[1].length;
    } catch (e) {
      r2 = 0;
    }
    m = 10 ** Math.max(r1, r2); // last modify by deeka //动态控制精度长度
    n = r1 >= r2 ? r1 : r2;
    return ((arg1 * m - arg2 * m) / m).toFixed(n);
  },
  // 乘法运算
  accMul(arg1, arg2) {
    let m = 0;
    let s1 = arg1.toString();
    let s2 = arg2.toString();
    try {
      m += s1.split('.')[1].length;
    } catch (e) {}
    try {
      m += s2.split('.')[1].length;
    } catch (e) {}
    return (Number(s1.replace('.', '')) * Number(s2.replace('.', ''))) / 10 ** m;
  },
  // 除法运算
  accDiv(arg1, arg2) {
    let t1 = 0;
    let t2 = 0;
    let r1;
    let r2;
    try {
      t1 = arg1.toString().split('.')[1].length;
    } catch (e) {}
    try {
      t2 = arg2.toString().split('.')[1].length;
    } catch (e) {}
    r1 = Number(arg1.toString().replace('.', ''));
    r2 = Number(arg2.toString().replace('.', ''));
    return (r1 / r2) * 10 ** (t2 - t1);
  }
};

module.exports = compute;