Summary of common object functions in JS

1. String object functions and attributes
Function:
CharAt (): returns the character at the specified position.
CharCodeAt (): returns the Unicode encoding of characters at the specified position.
Concat (): connection string.
IndexOf (): returns a string.
LastIndexOf (): Searches for strings from the back and forward.
Match (): finds matching of one or more regular expressions.
Replace (): replace the substring that matches the regular expression.
Search (): Searches for values that match the regular expression.
Slice (): extract the string segment and return the extracted part in the new string.
Split (): splits a string into a string array.
Substr (): extract a specified number of characters from the start index number.
Substring (): extract the characters between two specified index numbers in the string.
ToLowerCase (): converts a string to lowercase.
ToUpperCase (): converts a string to uppercase.
ToString (): returns a string.
Attribute:
Length: the length of the string.

2. Array object functions and attributes
Function:
Concat (): concatenate two or more arrays and return results.
Join (): put all elements of the array into a string. The elements are separated by the specified delimiter.
Pop (): deletes and returns the last element of the array.
Push (): add one or more elements to the end of the array and return a new length.
Reverse (): reverses the order of elements in the array.
Shift (): deletes and returns the first element of the array.
Slice (): returns the selected element from an existing array
Sort (): sorts the elements of an array.
Splice (): delete an element and add a new element to the array.
ToSource (): returns the source code of the object.
ToString (): converts an array to a string and returns the result.
ToLocaleString (): converts an array to a local array and returns the result.
Unshift (): add one or more elements to the beginning of the array and return a new length.
Attribute:
Length: Number of arrays

3. Time object functions and attributes
Function:
Date (): returns the Date and time of the current day.
GetDate (): returns a day (1 ~ 31 ).
GetDay (): returns a day of the week from the Date object (0 ~ 6 ).
GetMonth (): returns the month from the Date object (0 ~ 11 ).
GetFullYear (): returns the year from the Date object in four digits.
GetHours (): returns the hour of the Date object (0 ~ 23 ).
GetMinutes (): returns the minute of the Date object (0 ~ 59 ).
GetSeconds (): returns the number of seconds of the Date object (0 ~ 59 ).
GetMilliseconds (): returns the millisecond (0 ~) of the Date object ~ 999 ).
GetTime (): returns the number of milliseconds since January 1, January 1, 1970.
Parse (): returns the number of milliseconds from midnight, January 1, January 1, 1970 to the specified date (string.
SetDate (): set a day of the month in the Date object (1 ~ 31 ).
SetMonth (): set the month in the Date object (0 ~ 11 ).
SetFullYear (): set the year (four digits) in the Date object ).
SetYear (): Use the setFullYear () method instead.
SetHours (): set the hour in the Date object (0 ~ 23 ).
SetMinutes (): Set the minute in the Date object (0 ~ 59 ).
SetSeconds (): set the second in the Date object (0 ~ 59 ).
SetMilliseconds (): sets the millisecond in the Date object (0 ~ 999 ).
SetTime (): sets the Date object in milliseconds.
ToString (): converts a Date object to a string.

4. Mathematical object functions and attributes
Function:
Ceil (x): rounds up the logarithm.
Floor (x): returns the logarithm of a given number.
Max (x, y): returns the highest values in x and y.
Min (x, y): returns the lowest values in x and y.
Random (): returns 0 ~ A random number between 1.
Round (x): Rounds a number to the nearest integer.
Attribute:
PI: returns the circumference rate (approximately 3.14159 ).

5. JS global functions and attributes
Function:
DecodeURI (): Decode a URI.
DecodeURIComponent (): Decode an encoded URI component.
EncodeURI (): encodes a string into a URI.
EncodeURIComponent (): encodes a string into a URI component.
Escape (): encode a string.
Eval (): calculates the JavaScript string and runs it as script code.
IsNaN (): checks whether a value is a number.
Number (): converts an object value to a Number.
ParseFloat (): parses a string and returns a floating point number.
ParseInt (): parses a string and returns an integer.
String (): converts an object value to a String.
Unescape (): decodes a string encoded by escape.