node.js - 如何将数组写入文件
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node.js - how to write an array to file
提问by dopplesoldner
I have a sample array as follows
我有一个示例数组如下
var arr = [ [ 1373628934214, 3 ],
[ 1373628934218, 3 ],
[ 1373628934220, 1 ],
[ 1373628934230, 1 ],
[ 1373628934234, 0 ],
[ 1373628934237, -1 ],
[ 1373628934242, 0 ],
[ 1373628934246, -1 ],
[ 1373628934251, 0 ],
[ 1373628934266, 11 ] ]
I would like to write this array to a file such as I get a file as follows
我想将此数组写入一个文件，例如我得到一个文件如下
1373628934214, 3
1373628934218, 3
1373628934220, 1
......
......
回答by mak
If it's a huuge array and it would take too much memory to serialize it to a string before writing, you can use streams:
如果它是一个巨大的数组，并且在写入之前将其序列化为字符串需要太多内存，则可以使用流：
var fs = require('fs');
var file = fs.createWriteStream('array.txt');
file.on('error', function(err) { /* error handling */ });
arr.forEach(function(v) { file.write(v.join(', ') + '\n'); });
file.end();
回答by Jairo
Remember you can access good old ECMAScript APIs, in this case, JSON.stringify().
请记住，您可以访问良好的旧 ECMAScript API，在本例中为JSON.stringify().
For simple arrays like the one in your example:
对于像您示例中的简单数组：
require('fs').writeFile(
'./my.json',
JSON.stringify(myArray),
function (err) {
if (err) {
console.error('Crap happens');
}
}
);
回答by Denys Séguret
回答by valdeci
To do what you want, using the fs.createWriteStream(path[, options])function in a ES6 way:
要执行您想要的操作，请以 ES6 方式使用fs.createWriteStream(path[, options])函数：
const fs = require('fs');
const writeStream = fs.createWriteStream('file.txt');
const pathName = writeStream.path;
let array = ['1','2','3','4','5','6','7'];
// write each value of the array on the file breaking line
array.forEach(value => writeStream.write(`${value}\n`));
// the finish event is emitted when all data has been flushed from the stream
writeStream.on('finish', () => {
console.log(`wrote all the array data to file ${pathName}`);
});
// handle the errors on the write process
writeStream.on('error', (err) => {
console.error(`There is an error writing the file ${pathName} => ${err}`)
});
// close the stream
writeStream.end();
回答by KamalDeep
We can simply write the array data to the filesystem but this will raise one error in which ',' will be appended to the end of the file. To handle this below code can be used:
我们可以简单地将数组数据写入文件系统，但这会引发一个错误，其中“,”将附加到文件末尾。要处理此问题，可以使用以下代码：
var fs = require('fs');
var file = fs.createWriteStream('hello.txt');
file.on('error', function(err) { Console.log(err) });
data.forEach(value => file.write(`${value}\r\n`));
file.end();
\r\n
\r\n
is used for the new Line.
用于新线。
\n
\n
won't help. Please refer this
不会有帮助。请参考这个
