如何在 Node.js 中复制文件？

Node.js 是一个开源和跨平台的运行时环境，用于在浏览器之外执行 JavaScript 代码。 Node.js 运行在各种平台上，例如 Windows、Linux、Mac OS。

Node.js 中使用了多种方法，例如 readFile() 和 writeFile() 方法。 readFile() 和 writeFile() 方法用于将文件的内容复制到另一个文件。

解释：

• readFile(file[,option],callback )

1. file: Source filename path.
2. option: It has to encode i.e. utf8.
3. callback: The callback gets two arguments.

• writeFile(filename, data,encoding, callback)

1. filename: Filepath of the file to read.
2. data: It is the data that we want to write.
3. encoding: It is the encoding of the data.
4. callback: It will show the error or null.

执行

Javascript

var fs=require('fs'); // Import the filesystem module
  
console.log('File Reading from file.txt ..........');
  
// ReadFile method is used to read the content from file.txt
fs.readFile('file.txt','utf8',readingFile);
  
function readingFile(error,data)
{
    if(error){
        console.log(error);
    } else
    {
        console.log(data); // Printing the file.txt file's content
          
         // Creating new file - paste.txt with file.txt's content
        fs.writeFile('paste.txt',data,'utf8',writeFile);
    } 
}
  
function writeFile(error)
{
    if(error){
        console.log(error)
    } else {
        console.log('Content has been pasted to paste.txt file');
    }
}

输出

输出