lenye_base/number_format.js

基础方法

'use strict';

/**
 * https://locutus.io/php/
 */
// eslint-disable-next-line max-params
var numberFormat = (number, decimals, decPoint, thousandsSep) => {
  //   example 1: bbo.math.numberFormat(1234.56)
  //   returns 1: '1,235'
  //   example 2: bbo.math.numberFormat(1234.56, 2, ',', ' ')
  //   returns 2: '1 234,56'
  //   example 3: bbo.math.numberFormat(1234.5678, 2, '.', '')
  //   returns 3: '1234.57'
  //   example 4: bbo.math.numberFormat(67, 2, ',', '.')
  //   returns 4: '67,00'
  //   example 5: bbo.math.numberFormat(1000)
  //   returns 5: '1,000'
  //   example 6: bbo.math.numberFormat(67.311, 2)
  //   returns 6: '67.31'
  //   example 7: bbo.math.numberFormat(1000.55, 1)
  //   returns 7: '1,000.6'
  //   example 8: bbo.math.numberFormat(67000, 5, ',', '.')
  //   returns 8: '67.000,00000'
  //   example 9: bbo.math.numberFormat(0.9, 0)
  //   returns 9: '1'
  //  example 10: bbo.math.numberFormat('1.20', 2)
  //  returns 10: '1.20'
  //  example 11: bbo.math.numberFormat('1.20', 4)
  //  returns 11: '1.2000'
  //  example 12: bbo.math.numberFormat('1.2000', 3)
  //  returns 12: '1.200'
  //  example 13: bbo.math.numberFormat('1 000,50', 2, '.', ' ')
  //  returns 13: '100 050.00'
  //  example 14: bbo.math.numberFormat(1e-8, 8, '.', '')
  //  returns 14: '0.00000001'
  var _number = String(number).replace(/[^0-9+\-Ee.]/g, '');

  var _decimals = decimals;
  var n = !isFinite(Number(_number)) ? 0 : Number(_number);
  var prec = !isFinite(Number(_decimals)) ? 0 : Math.abs(_decimals);
  var sep = typeof thousandsSep === 'undefined' ? ',' : thousandsSep;
  var dec = typeof decPoint === 'undefined' ? '.' : decPoint;
  var s = '';

  var toFixedFix = function (n, prec) {
    if (String(n).indexOf('e') === -1) {
      return Number(Math.round(n + 'e+' + prec) + 'e-' + prec);
    } else {
      var arr = String(n).split('e');
      var sig = '';

      if (Number(arr[1]) + prec > 0) {
        sig = '+';
      }

      return Number(Math.round(Number(arr[0]) + 'e' + sig + (Number(arr[1]) + prec)) + 'e-' + prec).toFixed(prec);
    }
  }; // @todo: for IE parseFloat(0.55).toFixed(0) = 0;


  s = (prec ? toFixedFix(n, prec).toString() : String(Math.round(n))).split('.');

  if (s[0].length > 3) {
    s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep);
  }

  if ((s[1] || '').length < prec) {
    s[1] = s[1] || '';
    s[1] += new Array(prec - s[1].length + 1).join('0');
  }

  return s.join(dec);
};

module.exports = numberFormat;