utils.js

加减乘除运算

/**
 * @description: 加法运算
 * @param {*} arg1
 * @param {*} arg2
 * @param {*} number 展示小数点后位数
 * @return {*}
 */
export function operationAdd(arg1, arg2, number = 2) {
  let l1 = 0,
    l2 = 0,
    m,
    c;
  try {
    l1 = arg1.toString().split(".")[1].length;
  } catch (e) {}
  try {
    l2 = arg2.toString().split(".")[1].length;
  } catch (e) {}
  c = Math.abs(l1 - l2);
  m = Math.pow(10, Math.max(l1, l2));
  if (c > 0) {
    let cm = Math.pow(10, c);
    if (l1 > l2) {
      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(".", ""));
  }
  const sum = (arg1 + arg2) / m;
  let max = 0;
  try {
    max = sum.toString().split(".")[1].length;
  } catch (error) {}
  return sum.toFixed(number);
  // return max > number ? sum.toFixed(number) : sum;
}

/**
 * @description: 减法运算
 * @param {*} arg1
 * @param {*} arg2
 * @param {*} number 展示小数点后位数
 * @return {*}
 */
export function operationSub(arg1, arg2, number = 2) {
  let l1 = 0,
    l2 = 0,
    m,
    n;
  try {
    l1 = arg1.toString().split(".")[1].length;
  } catch (e) {
    l1 = 0;
  }
  try {
    l2 = arg2.toString().split(".")[1].length;
  } catch (e) {
    l2 = 0;
  }
  m = Math.pow(10, Math.max(l1, l2)); //last modify by deeka //动态控制精度长度
  n = l1 >= l2 ? l1 : l2;
  const sum = (arg1 * m - arg2 * m) / m;
  let max = 0;
  try {
    max = sum.toString().split(".")[1].length;
  } catch (error) {}
  return sum.toFixed(number);
  // return max > number ? sum.toFixed(number) : sum.toFixed(n);
}

/**
 * @description: 乘法运算
 * @param {*} arg1
 * @param {*} arg2
 * @param {*} number 展示小数点后位数
 * @return {*}
 */
export function operationMul(arg1, arg2, number = 2) {
  let m = 0,
    l1 = 0,
    l2 = 0,
    s1 = arg1.toString(),
    s2 = arg2.toString();
  try {
    m += s1.split(".")[1].length;
    l1 = arg1.toString().split(".")[1].length;
  } catch (e) {
    l1 = 0;
  }
  try {
    m += s2.split(".")[1].length;
    l2 = arg2.toString().split(".")[1].length;
  } catch (e) {
    l2 = 0;
  }
  const sum =
    (Number(s1.replace(".", "")) * Number(s2.replace(".", ""))) /
    Math.pow(10, m);
  let max = 0;
  try {
    max = sum.toString().split(".")[1].length;
  } catch (error) {}
  return sum.toFixed(number);
  // return max > number ? sum.toFixed(number) : sum;
}

/**
 * @description: 除法运算
 * @param {*} arg1
 * @param {*} arg2
 * @param {*} number 展示小数点后位数
 * @return {*}
 */
export function operationDiv(arg1, arg2, number = 2) {
  let l1 = 0,
    l2 = 0,
    r1,
    r2;
  try {
    l1 = arg1.toString().split(".")[1].length;
  } catch (e) {}
  try {
    l2 = arg2.toString().split(".")[1].length;
  } catch (e) {}
  r1 = Number(arg1.toString().replace(".", ""));
  r2 = Number(arg2.toString().replace(".", ""));
  const sum = (r1 / r2) * Math.pow(10, l2 - l1);
  let max = 0;
  try {
    max = sum.toString().split(".")[1].length;
  } catch (error) {}
  return sum.toFixed(number);
  // return max > number ? sum.toFixed(number) : sum;
}

数字添加千分位分隔符

/**
 * 添加千分位
 * @param {Object} value
 */
export const formatThousands = (value) => {
  if (value === undefined || value === null || value == "0") {
    value = "0.00";
  }
  if (!isNaN(value)) {
    value = value + "";
  }
  let re = /\d{1,3}(?=(\d{3})+$)/g;
  let n1 = value.replace(/^(\d+)((\.\d+)?)$/, function (s, s1, s2) {
    return s1.replace(re, "$&,") + s2;
  });
  return n1;
};

获取几个月前的日期

// 获取几个月前的日期
export function getRecentMonth(monthNum = 0) {
  let date = new Date();
  date.setMonth(date.getMonth() - monthNum, 1);
  return {
    year: date.getFullYear(),
    month: date.getMonth() + 1,
  };
}