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Editor to share with you what the properties and methods of JavaScript digital objects are, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

JavaScript Number object

JavaScript has only one numeric type. JavaScript numbers can be written with or without decimal points:

Var pi=3.14; / / use var x decimal point 34; / / do not use decimal point

Very large or very small numbers can be written by scientific (exponential) counting:

Var yearly 123e5; / / 12300000var zonal 123eMur5; / / 0.00123

All JavaScript digits are 64 bits

JavaScript is not a typed language. Unlike many other programming languages:

JavaScript does not define different types of numbers, such as integers, short, long, floating point, and so on.

All numbers in JavaScript are stored as 64-bit (8-bit), floating-point numbers with root 10.

Precision.

Integers (without decimal or exponential counting) are up to 15 digits.

The maximum number of decimal places is 17, but floating-point operations are not always 100% accurate:

Var x; [xss_clean] ("

Only 17 digits: "); x xss_clean 12345678901234567890; [x +"

); [xss_clean] ("

0.2 to 0.1 = "); x to 0.2 to 0.1; [xss_clean] (x +")

); [xss_clean] ("

Can be multiplied by 10 and divided by 10: "); x = (0.2-10-0.1-10) / 10; [xss_clean] (x +"

")

Octal and hexadecimal

If the prefix is 0, JavaScript interprets the numeric constant as an octal number.

If the prefix is 0 and "x", JavaScript is interpreted as a hexadecimal number.

Var yearly 0377 th var z=0xFF

Tip: never write zeros in front of a number unless you need to convert octal.

Properties and description of Number object

Constructor: returns a reference to the Number function that created this object.

MAX_VALUE: the maximum number that can be represented.

MIN_VALUE: the smallest number that can be expressed.

NaN: non-numeric value.

NEGATIVE_INFINITY: negative infinity, which is returned on overflow.

POSITIVE_INFINITY: positive infinity, which is returned on overflow.

Prototype: gives you the ability to add properties and methods to objects.

Number object method and description

ToString (): converts a number to a string, using the specified cardinality.

ToLocaleString (): converts numbers to strings, using the local numeric format order.

ToFixed (): converts a number to a string with a specified number of digits after the decimal point of the result.

ToExponential (): converts the value of an object to an exponential counting method.

ToPrecision (): formats the number to the specified length.

ValueOf (): returns the basic numeric value of a Number object.

These are all the contents of the article "what are the properties and methods of JavaScript digital objects". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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