fs.truncate(path[, len], callback)

• path <string> | <Buffer> | <URL>
• len <integer> 默认值: 0
• callback <Function>
  • err <Error>

截断文件。 除了可能的异常之外，没有为完成回调提供任何参数。 文件描述符也可以作为第一个参数传入。 在这种情况下，fs.ftruncate() 被调用。

import { truncate } from 'fs';
// 假设 'path/file.txt' 是普通文件。
truncate('path/file.txt', (err) => {
  if (err) throw err;
  console.log('path/file.txt was truncated');
});const { truncate } = require('fs');
// 假设 'path/file.txt' 是普通文件。
truncate('path/file.txt', (err) => {
  if (err) throw err;
  console.log('path/file.txt was truncated');
});

不推荐传入文件描述符，并且可能会导致将来抛出错误。

有关更多详细信息，请参阅 POSIX truncate(2) 文档。

• path <string> | <Buffer> | <URL>
• len <integer> Default: 0
• callback <Function>
  • err <Error>

Truncates the file. No arguments other than a possible exception are given to the completion callback. A file descriptor can also be passed as the first argument. In this case, fs.ftruncate() is called.

import { truncate } from 'fs';
// Assuming that 'path/file.txt' is a regular file.
truncate('path/file.txt', (err) => {
  if (err) throw err;
  console.log('path/file.txt was truncated');
});const { truncate } = require('fs');
// Assuming that 'path/file.txt' is a regular file.
truncate('path/file.txt', (err) => {
  if (err) throw err;
  console.log('path/file.txt was truncated');
});

Passing a file descriptor is deprecated and may result in an error being thrown in the future.

See the POSIX truncate(2) documentation for more details.