escape characters in javascript

In daily development, we often need to use strings in JavaScript, and there are some special characters in strings that require escape characters to be correctly expressed. This article will introduce you to common escape characters in JavaScript.

1. What are escape characters?

Escape characters are a way of using characters or strings to represent some control characters that cannot be entered or expressed directly through the keyboard. It is common in character constants or strings in programming languages. When using it, you need to add "" (backslash) before the character or string to escape.

2. Common escape characters in JavaScript

1. ' Single quotes

In JavaScript, strings must use single quotes or double quotes bracketed. If you want to use single quotes in a string, you need to use the escape character ', for example:

const str = 'I don't know.';
console.log(str); // I don't know.

2. " Double quotes

Similarly, if you want When using double quotes in a string, you need to use escape characters", for example:

const str = "I said "Hello World!"";
console.log(str); // I said "Hello World!"

3. \ Backslash

Include backslashes in the string When , you need to use escape characters, because backslash is used to represent escape characters in JavaScript. For example:

const str = "C:\Program Files\Microsoft Visual Studio";
console.log(str); // C:Program FilesMicrosoft Visual Studio

4. Line break

Use
in the string to represent the newline character, so that the string can be divided into multiple lines for output. For example:

const str = "Hello
World!";
console.log(str); // Hello
                 // World!

5. Tab character

is used in the string to represent the tab character, which can align the text according to a certain width when output. For example:

const str = "Code    Runner!";
console.log(str); // Code    Runner!

6. Carriage return character

In the string, it represents the carriage return character. Its function is to move the current position to the beginning of the line without proceeding. Line break. For example:

const str = "HelloWorld!";
console.log(str); // World!

The reason for this output result is: after outputting "", the cursor returned to the beginning of the line, so "Hello" was overwritten.

7. The backspace character

is used in strings to represent the backspace character. Its function is to delete one character to the left. It is commonly used in processing input errors. For example:

const str = "HelloWorld!";
console.log(str); // HellWorld!

3. Summary

In JavaScript, escape characters need to be used when the string contains special characters. When expressing strings, mastering common escape characters can make the code more concise and standardized. Therefore, it is very important to master the use of escape characters.

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