ang-tool/test.html

JavaScript常用方法的封装|Encapsulation of common JavaScript methods

<!-- <script>
  function add (num1, num2) {






    function helperNumberDecimal (numStr) {
      return (numStr.split('.')[1] || '').length
    }
    /**
     * 数值转字符串，科学计数转字符串
     * @param { Number } num 数值
     *
     * @return {Number}
     */
    function toNumberString (num) {
      var rest = '' + num
      var scienceMatchs = rest.match(/^([-+]?)((\d+)|((\d+)?[.](\d+)?))e([-+]{1})([0-9]+)$/)
      if (scienceMatchs) {
        var isNegative = num < 0
        var absFlag = isNegative ? '-' : ''
        var intNumStr = scienceMatchs[3] || ''
        var dIntNumStr = scienceMatchs[5] || ''
        var dFloatNumStr = scienceMatchs[6] || ''
        var sciencFlag = scienceMatchs[7]
        var scienceNumStr = scienceMatchs[8]
        var floatOffsetIndex = scienceNumStr - dFloatNumStr.length
        var intOffsetIndex = scienceNumStr - intNumStr.length
        var dIntOffsetIndex = scienceNumStr - dIntNumStr.length
        if (sciencFlag === '+') {
          if (intNumStr) {
            return absFlag + intNumStr + helperStringRepeat('0', scienceNumStr)
          }
          if (floatOffsetIndex > 0) {
            return absFlag + dIntNumStr + dFloatNumStr + helperStringRepeat('0', floatOffsetIndex)
          }
          return absFlag + dIntNumStr + helperNumberOffsetPoint(dFloatNumStr, scienceNumStr)
        }
        if (intNumStr) {
          if (intOffsetIndex > 0) {
            return absFlag + '0.' + helperStringRepeat('0', Math.abs(intOffsetIndex)) + intNumStr
          }
          return absFlag + helperNumberOffsetPoint(intNumStr, intOffsetIndex)
        }
        if (dIntOffsetIndex > 0) {
          return absFlag + '0.' + helperStringRepeat('0', Math.abs(dIntOffsetIndex)) + dIntNumStr + dFloatNumStr
        }
        return absFlag + helperNumberOffsetPoint(dIntNumStr, dIntOffsetIndex) + dFloatNumStr
      }
      return rest
    }



    function helperNumberAdd (addend, augend) {
      var str1 = toNumberString(addend)
      var str2 = toNumberString(augend)
      var ratio = Math.pow(10, Math.max(helperNumberDecimal(str1), helperNumberDecimal(str2)))
      return (multiply(addend, ratio) + multiply(augend, ratio)) / ratio
    }







    return helperNumberAdd(toNumber(num1), toNumber(num2))
  }


</script> -->