JS String Learning Notes

Several functions are commonly used:

CharAt () returns the character at the specified position.

Concat () connection string, similar to +.

IndexOf () returns the index position of the specified string. Note is a string.

Match () finds the matching of one or more regular expressions. The regular is not used ....

SUBSTR () extracts the specified number of characters from the starting index number in the string. For example: Str1.substr (0,1) 1 characters starting at index 0, that is, the first character. The second parameter is optional.

SUBSTRING () extracts the characters between two specified index numbers in a string.

Cases:

var str1= "Hello";
document.write (str1.substring (0,2)); will return he, notice that the return is not hel

Some of the other operations are to display strings in a number of different formats.

Here's a w3school about string manipulation.

String Object Properties

Properties	Description
Constructor	A reference to the function that created the object
Length	The length of the string
Prototype	Allows you to add properties and methods to an object

String Object method

Method	Description
Anchor ()	Creates an HTML anchor.
Big ()	Displays the string in a large font.
Blink ()	Displays the flashing string.
Bold ()	Use bold to display the string.
CharAt ()	Returns the character at the specified position.
charCodeAt ()	Returns the Unicode encoding of the character at the specified position.
Concat ()	The connection string.
Fixed ()	Displays the string as a typewriter text.
FontColor ()	Displays the string using the specified color.
FontSize ()	Displays the string using the specified dimensions.
fromCharCode ()	Creates a string from character encoding.
IndexOf ()	Retrieves a string.
Italics ()	Use italic to display strings.
LastIndexOf ()	The string is searched forward from the back.
Link ()	Displays the string as a link.
Localecompare ()	Compares two strings in a local-specific order.
Match ()	Finds a match for one or more regular expressions.
Replace ()	Replace the substring that matches the regular expression.
Search ()	Retrieves a value that matches a regular expression.
Slice ()	Extracts a fragment of a string and returns the extracted part in a new string.
Small ()	Use a small font size to display the string.
Split ()	Splits a string into an array of strings.
Strike ()	Use strikethrough to display strings.
Sub ()	Displays the string as subscript.
SUBSTR ()	Extracts a specified number of characters from the starting index number in a string.
SUBSTRING ()	Extracts the characters between two specified index numbers in a string.
SUP ()	Displays the string as superscript.
toLocaleLowerCase ()	Converts the string to lowercase.
toLocaleUpperCase ()	Converts the string to uppercase.
toLowerCase ()	Converts the string to lowercase.
toUpperCase ()	Converts the string to uppercase.
Tosource ()	Represents the source code for the object.
ToString ()	Returns a string.
ValueOf ()	Returns the original value of a string object.

JS String Learning Notes