edu-textbook/projects/textbook/src/services/compute.ts

/* 加减乘除精度计算 */
//相加
export const addNum = function addNum(arg1: number, arg2: number): number {
  arg1 = arg1 ? arg1 : 0;
  arg2 = arg2 ? arg2 : 0;
  let r1, r2, m, 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 = Math.pow(10, Math.max(r1, r2));
  if (c > 0) {
    let cm = Math.pow(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
export const subtraction = function subtraction(
  num1: number,
  num2: number
): number {
  var r1, r2, m, floatNum;
  try {
    r1 = num1.toString().split('.')[1].length;
  } catch (e) {
    r1 = 0;
  }
  try {
    r2 = num2.toString().split('.')[1].length;
  } catch (e) {
    r2 = 0;
  }
  m = Math.pow(10, Math.max(r1, r2));
  return (num1 * m - num2 * m) / m;
};

//相乘
export const multiply = function multiply(arg1: number, arg2: number): number {
  arg1 = arg1 ? arg1 : 0;
  arg2 = arg2 ? arg2 : 0;
  let r1, r2, m, 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 = Math.pow(10, Math.max(r1, r2) * 2);
  if (c > 0) {
    let cm = Math.pow(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;
};

//相除
export const accDiv = function accDiv(arg1: number, arg2: number): number {
  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) {}
  r1 = Number(arg1.toString().replace('.', ''));
  r2 = Number(arg2.toString().replace('.', ''));
  let n = (r1 / r2) * Math.pow(10, t2 - t1);
  return Math.round(n)
}