Javascript number object

ArticleDirectory

• Number object Method
• Number Object Attributes

Javascript has only one numeric type. It is represented as a 64-bit floating point number internally, the same as Java's double. Unlike most otherProgramming Language, It does not separate the integer type, so 1 and 1.0 are the same value. This provides great convenience, because it completely avoids short integer overflow. Everything you need to know is that it is a number. This avoids a lot of errors caused by the number type.

Number object Method

FF: Firefox, ie: Internet Explorer

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Method	Description	FF	IE
Tostring	Converts a number to a string and uses the specified base number.	1.0	4.0
Tolocalestring	Converts a number to a string in the format of a local number.	1.0	4.0
Tofixed	Converts a number to a string. The result is a number of the specified digits after the decimal point.	1.0	5.5
Toexponential	Converts a number to a string and returns an exponential notation. the decimal point has a specified decimal number.	1.0	5.5
Toprecision	Converts a number to a string that contains a valid number of specified digits. The exponential or fixed-point counting method is used to determine the value of a number and the specified number of valid digits.	1.0	5.5
Tosource ()	Representing the objectSource code	1.0	-
Valueof	Returns the basic numeric value of A number object.	1.0	4.0

Number Object Attributes

attribute	description	FF	ie
max_value	the maximum number that can be expressed.	1.0	4.0
min_value	the smallest number that can be expressed.	1.0	4.0
Nan	non-numeric value.	1.0	4.0
negative_infinity	negative infinity. This value is returned when overflow occurs.	1.0	4.0
positive_infinity	positive infinity. This value is returned when overflow occurs.	1.0	4.0

VaR isnumber = function (n) {return typeof n = 'number' & isfinite (n );}
 

 
Alert (0.1 + 0.2) = 0.3) // false
 

Obtain Random Number

 
Function getrandom (Min, max) {return math. Floor (math. Random () * (max-min + 1) + min ;}
 

There is a special value in Javascript called infinity. It represents a number too big
For JavaScript to handle. Infinity is indeed a number, as typing typeof infinity
In the console will confrm. You can also quickly check that a number with 308 Zeros
Is OK, but 309 Zeros is too much. To be precise, the biggest number javascript can
Handle is 1.7976931348623157e + 308 while the smallest is 5e-324.

Convert JavaScript decimal to binary, convert binary to decimal

 var random = (function () {var seed = 49734321; return function () {// Robert Jenkins '32 bit integer Hash function. seed = (seed + 0x7ed55d16) + (seed <12) & 0 xffffffff; seed = (seed ^ 0xc761c23c) ^ (seed >>> 19 )) & 0 xffffffff; seed = (seed + 0x165667b1) + (seed <5) & 0 xffffffff; seed = (seed + 0xd3a2646c) ^ (seed <9 )) & 0 xffffffff; seed = (seed + 0xfd7046c5) + (seed <3) & 0 xffffffff; seed = (seed ^ 0xb55a4f09) ^ (seed >>> 16) & 0 xffffffff; Return (Seed & 0 xfffffff)/0x10000000 ;}) (); console. log (random () console. log (random () console. log (random () console. log (random () console. log (random () console. log (random () console. log (random () console. log (random () console. log (random () console. log (random ()