Javascript[object. Properties] Highlights of the three

javascript| objects

String Object

A String object provides a number of ways to manipulate the contents of a string.

Property

Length string, that is, the number of characters in the string.

Method

Big (), Blink (), bold (), fixed (), italics (), small (), sub (), Strike (), SUP (), fontcolor (color), fontsize (size)

The above method adds the appropriate HTML markup for the string.

CharAt (index) returns the character at index in the string.

IndexOf (Searchvalue,[fromindex]) This method searches the string for the first occurrence of the searchvalue. If a fromindex is given, the

The position within the string begins the search, and when Searchvalue is found, returns the position of the first character of the string.

LastIndexOf (Searchvalue,[fromindex]) searches searchvalue from the tail of the string and reports the first instance found.

SUBSTRING (INDEXA,INDEXB) gets the substring from indexa to INDEXB.

toLowerCase (), toUpperCase () converts all characters in the string to uppercase and lowercase.

Date Object

To use the Date object, you must be a date instance:

Variable name =new Date ();

Method

Getday (), GetDate (), getHours (), getminutes (), getmonth (), getseconds (), GetTime (),

getTimezoneOffset (), getyear ()

and Setday ...

toGMTString () returns the current time in GMT format. (sun,12 Feb 1999 14:19:22 GMT)

toLocaleString returns the current time in locale format. (03/11/99 14:19:22)

Parse (date) converts a normal date string to Hao second

Math Object

Property

LN10 (natural logarithm of 10)

PI (3.1415926 ...)

Sqrt1_2 (square root of 1/2)

Method

ABS (x) returns the absolute value of X

ACOs (x) returns the arc cosine value of X

ASIN (x) returns the arc sin value of x

Atan (x) returns the arc tangent value of X

Ceil (x) returns the smallest integer greater than or equal to X

COS (x) returns the cosine value of X

EXP (x) returns the X-second side of E

Floor (x) returns the largest integer less than or equal to X

Log (x) returns X's

Max (x,y) returns a large value in X,y

MIN (x,y) returns the decimal value in X,y

POW (x,y) returns the Y-second side of X

Round (x) rounded to the nearest integer, (less than or equal to 0.5 decimal places)

Sin (x) returns the sin value of x

SQRT (x) returns the square root of X

Tan (x) returns the tangent value of X

form, thereby giving the settime () a parameter.