Common operation methods and special characters of strings in JavaScript

This article mainly introduces the common operation methods of strings in JavaScript and js special characters. Friends in need can refer to

Let’s take a look at the common operation methods of js strings. The specific content is as follows :

Charat () to get the characters in the specific index in the string; The position where a specific string appears for the first time in the string

substring() Returns a substring of the string

slice() Returns a substring of the string, supports negative parameters ( The last character in the string is set to -1)

concat()                                                                                                                                                                                                can be used to concatenate multiple strings into one string

replace()                                                               Replace substrings with specific strings

split()                                                                       ’ s ’ s ’ s ’ s ’ s ’ s to be 1 to 1 s .            String

search() Use regular expression to search the target substring (the index is returned)

ps: JavaScript special characters

You can use backslashes in JavaScript to add special characters to text strings. Insert special characters

Backslashes are used to insert ellipses, newlines, quotation marks, and other special characters in text strings.

Please look at the following JavaScript code:

var txt="We are the so-called "Vikings" from the north."
document.write(txt)

In JavaScript, strings use single quotes or double quotes to start or end. This means that the above string will be truncated to: We are the so-called.

To solve this problem, you must add a backslash (\) before the quotation marks in "Viking". This converts each double quote into a literal string.

var txt="We are the so-called \"Vikings\" from the north."
document.write(txt)

Now JavaScript can output the correct text string: We are the so-called "Vikings" from the north.

Here is another example:

document.write ("You \& me are singing!")

The above example will produce the following output:

You & me are singing!

The table below lists The remaining special characters can be added to the text string using backslashes:

Code	Output
\'	Single quotes
\"	Double quotes
\&	and ampersand
\\	Backslash
\n	Line break
\r	Carriage return character
\t	Tab character
\b	Backspace character
\f	Form feed character

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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