输出到控制台和日志文件

Question

我正在捕获console.log数据并将其保存到日志文件中，但我也想在控制台中显示数据。我怎样才能做到这一点？我宁愿不要安装一个包就行。

这是我在用捕捉console.log数据：

var stdo = fs.createWriteStream('log.txt', {'flags': 'a'}); 
var write = function(write) { 
    return function(string, encoding, fd) { 
    stdo.write(string); 
    }; 
}; 
process.stdout.write = write(process.stdout.write); 

Answer 1

请检查this答案。

所以你几乎可以这样做。

const fs = require('fs'); 
 

 
let outputFileStream = fs.createWriteStream('log.txt', {'flags': 'a'}); 
 

 
const originalWrite = process.stdout.write; 
 

 
process.stdout.write = function() { 
 
    originalWrite.apply(process.stdout, arguments); 
 
    outputFileStream.write.apply(outputFileStream, arguments); 
 
}; 
 

 
//These 3 lines go both to the file and to the console. 
 
console.log('What is love'); 
 
console.log('Baby don\'t hurt me'); 
 
console.log('Don\'t hurt me'); 
 

 
//Won't get to the file. As it's a different stream. 
 
console.error('No more');