nodejs采集替换内容文字？

const http = require('https');
const fs = require('fs');
http.get('https://baidu.com',(res)=>{
//res is the response

res.setEncoding('binary');//treat res as the binary without thinking about the enconding
var body = '';
res.on('data',(chunk)=>{
body+=chunk;
});

res.on('end',()=>{
fs.writeFile('./xxxx.js',body,'binary',()=>{
console.log('collection is completed');
});
});
});

上面代码直接整页生成。如果要在采集的时候把部分关键词替换能直接做得到。还是需要其它脚本。比如把“百度”关键词改成“千度”

const http = require('https');
const fs = require('fs');
http.get('https://baidu.com',(res)=>{
    res.setEncoding('binary');

    let body = '';

    res.on('data',(chunk)=>{
        // 在这里替换关键词
        chunk = chunk.replace(/百度/g, '千度');
        body+=chunk;
    });

    res.on('end',()=>{
        fs.writeFile('./xxxx.js',body,'binary',()=>{
            console.log('collection is completed');
        });
    });
});