nodejs settings Chinese

Node.js is a JavaScript runtime environment based on the Chrome V8 engine that makes it easy to build high-performance web applications. It is widely used for server-side development and building various web applications. In the Node.js program, Chinese needs to be processed, so the relevant Chinese environment needs to be set up. This article will introduce how to set up a Chinese environment in Node.js.

1. Set the character encoding

In Node.js, you can use the following code to set the character encoding:

process.env.LANG = 'en_US.UTF-8';

The above code will set the LANG environment variable to en_US.UTF -8, which will ensure that the entire program uses UTF-8 character encoding. If you do not set the encoding, you may encounter problems with garbled characters or incompatible character encodings.

2. Use iconv-lite library

iconv-lite is an important library for handling character encoding in Node.js. It can easily convert strings from one character encoding to another. To use the iconv-lite library in Node.js, you need to install the library first. You can install it through the following command:

npm install iconv-lite --save

After the installation is complete, introduce the library into the code:

const iconv = require('iconv-lite');

Use iconv-lite library, can perform the following operations:

1. Convert a string from one encoding to another

const str = '中文字符串';
const strGbk = iconv.encode(str, 'gbk');
const strUtf8 = iconv.decode(strGbk, 'utf8');
console.log(strUtf8);

The above code will first convert the str string Encode to GBK encoding and then decode the GBK encoded string to UTF-8 encoding to convert from one encoding to another.

2. Read data from the file and convert the encoding

const fs = require('fs');
const content = fs.readFileSync('test.txt');
const contentUtf8 = iconv.decode(content, 'utf8');
console.log(contentUtf8);

The above code will read the content from the test.txt file and convert it from GBK encoding to UTF -8 encoding for easier subsequent manipulation.

3. Convert string to Buffer type

const str = '中文字符串';
const buf = iconv.encode(str, 'utf8');
console.log(buf);

The above code will encode the str string into Buffer type to facilitate processing of binary data in Node.js.

3. Use the fs module to process Chinese

The fs module in Node.js can be used to read and write files, process directories and other operations. When using the fs module to read and write Chinese files, you need to pay attention to some issues, such as file encoding, file path, etc.

1. Read Chinese files

const fs = require('fs');
const iconv = require('iconv-lite');

const content = fs.readFileSync('test.txt');
const contentUtf8 = iconv.decode(content, 'utf8');
console.log(contentUtf8);

The above code will read the content from the test.txt file and convert it from GBK encoding to UTF-8 encoding.

2. Write Chinese file

const fs = require('fs');
const iconv = require('iconv-lite');

const content = '中文字符串';
const contentGbk = iconv.encode(content, 'gbk');
fs.writeFileSync('test.txt', contentGbk);

The above code will encode the content string into GBK encoding and write it to the test.txt file.

4. Use the readline module to read files line by line

In Node.js, you can use the readline module to read files line by line to facilitate processing of large files. When reading files containing Chinese, you need to pay attention to the file encoding so that each line of string can be read correctly.

const readline = require('readline');
const fs = require('fs');
const iconv = require('iconv-lite');

const rl = readline.createInterface({
  input: fs.createReadStream('test.txt').pipe(iconv.decodeStream('gbk'))
});

rl.on('line', (line) => {
  console.log(`读取到一行：${line}`);
});

The above code will read data line by line from the test.txt file and convert each line of string into UTF-8 encoding for processing.

5. Conclusion

Node.js is a very popular JavaScript running environment and is widely used in server-side development and web application construction. When using Node.js for Chinese processing, you need to set the correct character encoding, use relevant libraries for encoding conversion, and pay attention to file encoding and other issues. Through the introduction of this article, I believe that readers have a deeper understanding of Chinese processing in Node.js, and can carry out corresponding development work more conveniently.

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