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Interface Number

Add some helpful methods for Number.prototype

Hierarchy

  • Number

Index

Methods

Methods

abs

  • abs(): number

  • Returns a new abs number.
    返回绝对值

    Returns number

add

  • add(n: number | string | Number): number

  • Returns a new added number. The old number will not be changed.
    返回新增后数字，原数字不会被改变。

    Parameters

    • n: number | string | Number

      input number

    Returns number

div

  • div(n: number | string | Number): number

  • Returns a new divided number. The old number will not be changed.
    返回新增后数字，原数字不会被改变。

    Parameters

    • n: number | string | Number

      input number

    Returns number

equals

  • equals(n: number | string | Number, dLen?: number): boolean

  • Returns true if it equals an other number.
    是否相等

    Parameters

    • n: number | string | Number
    • Optional dLen: number

    Returns boolean

format

  • format(digit?: number): string

  • Returns a format number string
    每三位整数逗号分割

    Number(1).format(2); //return "1.00"
Number(-12345.6789).format(3);  //return "-12,345.679"

    Parameters

    • Optional digit: number

    Returns string

fractionLength

  • fractionLength(): number

  • Returns the length of fractional part.
    返回小数位长度

    Number(123).fractionLength(); //return 0
Number(123.4567).fractionLength(); //return 4

    Returns number

fractionalPart

  • fractionalPart(): string

  • Returns the fractional part.

    Returns string

integerLength

  • integerLength(): number

  • Returns the length of intergral part.
    返回整数位长度

    Number(0.1234).integerLength(); //return 0
Number(123.4567).fractionLength(); //return 3

    Returns number

integralPart

  • integralPart(): string

  • Returns the integral part.

    Returns string

isEven

  • isEven(): boolean

  • Is an even number?
    是否是偶数

    Returns boolean

isFinite

  • isFinite(): boolean

  • Is a finite number?
    是否有效数字

    Returns boolean

isFloat

  • isFloat(): boolean

  • Is a float number?
    是否浮点数

    Returns boolean

isInt

  • isInt(): boolean

  • Is an integer number?
    是否整数

    Returns boolean

isNaN

  • isNaN(): boolean

  • Is NaN?
    是否数字

    Returns boolean

isNegative

  • isNegative(): boolean

  • Is a negative number?
    是否负数

    Returns boolean

isOdd

  • isOdd(): boolean

  • Is an odd number?
    是否是奇数

    Returns boolean

isPositive

  • isPositive(): boolean

  • Is a positive number?
    是否正数

    Returns boolean

isZero

  • isZero(): boolean

  • Is zero?
    是否是零

    Returns boolean

mul

  • mul(n: number | string | Number): number

  • Returns a new multiplied number. The old number will not be changed.
    返回新增后数字，原数字不会被改变。

    Parameters

    • n: number | string | Number

      input number

    Returns number

round

  • round(digit?: number): number

  • Returns a new round number.
    四舍五入，保留N位小数位数

    Parameters

    • Optional digit: number

    Returns number

stringify

  • stringify(): string

  • Returns a number string.
    返回数字字符串

    Returns string

sub

  • sub(n: number | string | Number): number

  • Returns a new substracted number. The old number will not be changed.
    返回新增后数字，原数字不会被改变。

    Parameters

    • n: number | string | Number

      input number

    Returns number

toInt

  • toInt(): number

  • Returns a new integer.
    转换为整数。 注意：采取四舍五入。

    Returns number