Numerical extension of 27es6

1、Number.EPSILON yes JavaScript The minimum precision of the representation (EPSILON The value of is close to 2.22044……E-16, Used to determine the precision of floating point numbers )

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2、 Binary system 、 Octal and hexadecimal

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3、Number.isFinite Check whether a value is finite

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4、Number.isNaN Check whether a value is NaN

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5、Number.parseInt  Number.parseFloat String to integer

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6、Number.isInteger Judge whether a number is an integer

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7、Math.trunc Erase the decimal part of the number

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8、Math.sign Judge whether a number is positive , negative , still 0

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