var fs = require('fs');
fs.createReadStream('test.log').pipe(fs.createWriteStream('newLog.log'));
在节点v8.5.0中，添加了copyFile
const fs = require('fs');
// destination.txt will be created or overwritten by default.
fs.copyFile('source.txt', 'destination.txt', (err) => {
if (err) throw err;
console.log('source.txt was copied to destination.txt');
});
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