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

版本历史

版本	变更
v18.0.0	Passing an invalid callback to the `callback` argument now throws `ERR_INVALID_ARG_TYPE` instead of `ERR_INVALID_CALLBACK`.
v16.0.0	The error returned may be an `AggregateError` if more than one error is returned.
v10.0.0	The `callback` parameter is no longer optional. Not passing it will throw a `TypeError` at runtime.
v7.0.0	The `callback` parameter is no longer optional. Not passing it will emit a deprecation warning with id DEP0013.
v0.8.6	新增于: v0.8.6

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

截断文件。除了可能的异常外，没有其他参数会传递给完成回调函数。第一个参数也可以传入文件描述符。在这种情况下，会调用 fs.ftruncate()。

【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 'node: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('node: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');
});

传递文件描述符已被弃用，将来可能会导致抛出错误。

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

有关更多详细信息，请参阅 POSIX truncate(2) 文档。

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