如何在文本文件中从node.js中的特定行位置删除行

我不想在第7行之后删除所有的行。如何使用node.js和fs来实现这一点

const fs = require('fs');

文本文件（.txt）

您可以使用流，在达到所需行数后停止读取文件，并仅写入转换后的内容，即直到第n行的内容

const fs = require('fs');
const { Transform } = require('stream');


const clipLines = maxLines => {

    // Get new line character code [10, 13]
    const NEWLINES = ['\n', '\r\n'].map(item => item.charCodeAt(0));
    let sourceStream;
    let linesRemaining = maxLines;

    const transform = new Transform({

        transform(chunk, encoding, callback) {

            const chunks = [];

            // Loop through the buffer
            for(const char of chunk) {

                chunks.push(char); // Move to the end if you don't want the ending newline

                if(NEWLINES.includes(char) && --linesRemaining == 0) {  
                    sourceStream.close(); // Close stream, we don't want to process any more data.
                    break;
                }
            }

            callback(null, Buffer.from(chunks));
        }
    });

    transform.on('pipe', source => {
        sourceStream = source

        if(maxLines <= 0)
            source.close();
    });

    return transform;

}

fs.createReadStream('test.txt')
    .pipe(clipLines(7))
    .pipe(fs.createWriteStream('out.txt'))

const fs=require（'fs'）；
const{Transform}=require（'stream'）；
常数clipLines=maxLines=>{
//获取新行字符代码[10,13]
常量换行符=['\n'，'\r\n'].map（item=>item.charCodeAt（0））；
让源流；
设linesRemaining=maxLines；
常量变换=新变换({
转换（块、编码、回调）{
常量块=[]；
//循环通过缓冲区
for（块的常量字符）{
chunks.push（char）；//如果不需要结束换行符，请移到末尾
if（NEWLINES.includes（char）&&--linesRemaining==0）{
sourceStream.close（）；//关闭流，我们不想再处理任何数据。
打破
}
}
回调（null，Buffer.from（chunks））；
}
});
transform.on（'pipe'，source=>{
sourceStream=源
如果（最大线）
const fs = require('fs');
const { Transform } = require('stream');


const clipLines = maxLines => {

    // Get new line character code [10, 13]
    const NEWLINES = ['\n', '\r\n'].map(item => item.charCodeAt(0));
    let sourceStream;
    let linesRemaining = maxLines;

    const transform = new Transform({

        transform(chunk, encoding, callback) {

            const chunks = [];

            // Loop through the buffer
            for(const char of chunk) {

                chunks.push(char); // Move to the end if you don't want the ending newline

                if(NEWLINES.includes(char) && --linesRemaining == 0) {  
                    sourceStream.close(); // Close stream, we don't want to process any more data.
                    break;
                }
            }

            callback(null, Buffer.from(chunks));
        }
    });

    transform.on('pipe', source => {
        sourceStream = source

        if(maxLines <= 0)
            source.close();
    });

    return transform;

}

fs.createReadStream('test.txt')
    .pipe(clipLines(7))
    .pipe(fs.createWriteStream('out.txt'))