node.js如何将文件一次性转化为可写流

可以使用Node.js内置的fs模块来读取文件并将其转化为可写流。具体步骤如下：

1. 创建可写流

const fs = require('fs');
const writeStream = fs.createWriteStream('output.txt');

2. 读取文件

const readStream = fs.createReadStream('input.txt');

3. 将读取到的数据通过管道(pipe)传入可写流中

readStream.pipe(writeStream);

完整代码示例如下：

const fs = require('fs');

const writeStream = fs.createWriteStream('output.txt');
const readStream = fs.createReadStream('input.txt');

readStream.pipe(writeStream);