fs.appendFileSync(path, data[, options])
path
<string> | <Buffer> | <URL> | <number> 文件名或文件描述符data
<string> | <Buffer>options
<Object> | <string>encoding
<string> | <null> 默认值:'utf8'
mode
<integer> 默认值:0o666
flag
<string> 请参阅对文件系统flags
的支持。 默认值:'a'
。
同步地将数据追加到文件中,如果文件尚不存在则创建该文件。
data
可以是字符串或 <Buffer>。
mode
选项仅影响新创建的文件。
有关详细信息,请参阅 fs.open()
。
import { appendFileSync } from 'node:fs';
try {
appendFileSync('message.txt', 'data to append');
console.log('The "data to append" was appended to file!');
} catch (err) {
/* 处理错误 */
}
如果 options
是字符串,则它指定编码:
import { appendFileSync } from 'node:fs';
appendFileSync('message.txt', 'data to append', 'utf8');
可以将 path
指定为已打开用于追加(使用 fs.open()
或 fs.openSync()
)的数字文件描述符。
文件描述符不会自动关闭。
import { openSync, closeSync, appendFileSync } from 'node:fs';
let fd;
try {
fd = openSync('message.txt', 'a');
appendFileSync(fd, 'data to append', 'utf8');
} catch (err) {
/* 处理错误 */
} finally {
if (fd !== undefined)
closeSync(fd);
}
path
<string> | <Buffer> | <URL> | <number> filename or file descriptordata
<string> | <Buffer>options
<Object> | <string>encoding
<string> | <null> Default:'utf8'
mode
<integer> Default:0o666
flag
<string> See support of file systemflags
. Default:'a'
.
Synchronously append data to a file, creating the file if it does not yet
exist. data
can be a string or a <Buffer>.
The mode
option only affects the newly created file. See fs.open()
for more details.
import { appendFileSync } from 'node:fs';
try {
appendFileSync('message.txt', 'data to append');
console.log('The "data to append" was appended to file!');
} catch (err) {
/* Handle the error */
}
If options
is a string, then it specifies the encoding:
import { appendFileSync } from 'node:fs';
appendFileSync('message.txt', 'data to append', 'utf8');
The path
may be specified as a numeric file descriptor that has been opened
for appending (using fs.open()
or fs.openSync()
). The file descriptor will
not be closed automatically.
import { openSync, closeSync, appendFileSync } from 'node:fs';
let fd;
try {
fd = openSync('message.txt', 'a');
appendFileSync(fd, 'data to append', 'utf8');
} catch (err) {
/* Handle the error */
} finally {
if (fd !== undefined)
closeSync(fd);
}