A detailed look at the \u escape character in JavaScript

Escape characters are a very useful concept in computer programming. There are many escape characters used in JavaScript, the most commonly used of which is the \u escape character. In this article, we will discuss the \u escape character in JavaScript in detail.

In JavaScript, the \u escape character is used to represent Unicode encoding. Unicode is an encoding scheme that maps all characters to a unique encoding value. Unicode encoding covers all character sets around the world, so it can be used to represent characters in any language. In short, if you want to use a character but it's not available on the keyboard, you can represent it via Unicode encoding.

For example, if you want to express the Chinese character "好" in JavaScript, its Unicode encoding is \u597d, then you can write like this:

var str = '\u597d';
console.log(str); // 输出: 好

In the above example, We defined a variable str, which was assigned the value \u597d, which is the Unicode encoding of "good". Then we printed str on the console, and the result was the word "good".

In addition, the \u escape character can also be used to represent some special characters, such as:

• \u0000: null character
• \u0009: horizontal format Table character
• \u000a: Line feed character
• \u000d: Carriage return character
• \u0022: Double quotation mark
• \u0027: Single quotation mark
• \u005c: Backslash

If you want to use these characters in JavaScript, you can represent them by their Unicode encoding.

For example, if you want to insert a double quote into a string, you can write it like this:

var str = '这是一个双引号：\u0022';
console.log(str); // 输出: 这是一个双引号："

In the above example, we defined a string whose value is "This is a double quote: \u0022", where "\u0022" represents the Unicode encoding of the double quote.

It should be noted that in JavaScript, Unicode encoding must be represented by four digits. For example, "\u597d" means "good", and "\u97d" cannot be recognized.

In addition to \u escape characters, there are also some escape characters that are also widely used:

• \n: Line feed character
• \r: Carriage return character
• \t: Tab character
• \b: Backspace character
• \f: Feed character
• \: Backslash character
• \': single quotation mark
• \": double quotation mark

These escape characters allow you to express some special characters, spaces or carriage returns and line feeds in the string etc. For example:

var str = '第一行\n第二行';
console.log(str); // 输出: 第一行
                  //       第二行

In the above example, we defined a string, which is assigned the value "first line\nsecond line", where "\n" represents the newline character, and finally Output two lines of text on the console, namely "first line" and "second line".

Summary:

In JavaScript, the \u escape character is used to represent Unicode Encoding can represent characters in any language. In addition, there are other escape characters used to represent special characters, spaces, carriage returns, line feeds, etc. Being proficient in these escape characters will allow you to operate better String.

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