How to operate JS strings and special characters

This time I will show you how to operate JS strings and special characters, and what are the precautions for operating JS strings and special characters. The following is a practical case, let's take a look.

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

charAt()                                                                                                                                                                             # ) Converts all characters of the string to uppercase letters;

indexOf() Returns the first occurrence of a specific string in the string

substring() Returns a substring of the string

slice()                                                                                                                                                                                                                                 that are used to combine multiple characters are all used to assemble multiple characters. Add strings together to form a string

replace() Replace a substring in the string with a specific string

split() Split a string into multiple strings , you can specify the delimiter

match() Use regular expression to search the target substring

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

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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