使用 Node.js 檔案系統操作時，選擇正確的檔案寫入方法可以顯著影響應用程式的效能。讓我們探討兩種常見的方法：fs.createWriteStream() 和 fs.writeFileSync()。
| Feature | fs.createWriteStream(path).write(buffer) | fs.writeFileSync(path, buffer) |
|---|---|---|
| Synchronicity | Asynchronous | Synchronous |
| Blocking | Non-blocking | Blocking |
| Performance | Better for large files or frequent writes | Better for small, infrequent writes |
| Memory Usage | More memory-efficient for large files | Loads entire content into memory |
| Error Handling | Requires callback or event listeners | Throws errors directly |
| Use Case | Streaming large files, real-time data | Quick, simple writes, small files |
| Control Flow | Continues execution immediately | Waits until write is complete |
| Backpressure Handling | Handles backpressure automatically | N/A |
基於流的方法非常適合處理大檔案或需要頻繁寫入資料時：
const fs = require('fs')
// Content to write
const content = 'Hello, Node.js file system!'
// Create a write stream
const writeStream = fs.createWriteStream('example1.txt')
// Write to the file
writeStream.write(content, 'UTF8')
// End the stream
writeStream.end()
// Handle finish event
writeStream.on('finish', () => {
console.log('Write completed.')
})
// Handle error event
writeStream.on('error', (err) => {
console.error('An error occurred:', err.message)
})
console.log('Program continues executing immediately.')
對於小檔案的簡單一次性寫入，同步方法可能更簡單：
const fs = require('fs')
// Content to write
const content = 'Hello, Node.js file system!'
try {
// Write to the file synchronously
fs.writeFileSync('example2.txt', content, 'UTF8')
console.log('Write completed.')
} catch (err) {
console.error('An error occurred:', err.message)
}
console.log('This line waits for the write operation to complete.')
這兩種方法在 Node.js 開發中都佔有一席之地。 createWriteStream 在涉及大檔案或頻繁寫入的場景中表現出色，而 writeFileSync 則非常適合簡單的小檔案操作。根據您的特定使用案例進行選擇，並考慮檔案大小、寫入頻率和效能要求等因素。
以上是Node.js 檔案寫入方法 - createWriteStream 與 writeFileSync的詳細內容。更多資訊請關注PHP中文網其他相關文章！
