Node.js stats.dev 属性
原文:https://www.geeksforgeeks.org/node-js-stats-dev-property/
stats.dev 属性是 fs 的一个内置应用编程接口。Stats 类用于获取文件所在设备的数字(number / bigint)标识。
语法:
stats.dev;
参数:该属性不接受任何参数。
返回值:返回一个数字或 BigInt 值，代表文件所在设备的标识。
下面的例子说明了 stats.dev 属性在 Node.js 中的使用:
例 1:
// Node.js program to demonstrate the
// stats.dev Property
// Accessing fs module
const fs = require('fs');
// Calling fs.Stats stats.dev
// using stat for file
fs.stat('./filename.txt', (err, stats) => {
if (err) throw err;
console.log("using stat: the numeric "
+ "identity of the device is "
+ stats.dev);
});
//using lstat for file
fs.lstat('./filename.txt', (err, stats) => {
if (err) throw err;
console.log("using lstat: the numeric "
+ "identity of the device is "
+ stats.dev);
});
//using stat for directory
fs.stat('./', (err, stats) => {
if (err) throw err;
console.log("using stat: the numeric "
+ "identity of the device is "
+ stats.dev);
});
//using lstat for directory
fs.lstat('./', (err, stats) => {
if (err) throw err;
console.log("using lstat: the numeric "
+ "identity of the device is "
+ stats.dev);
});
输出:
using stat: the numeric identity of the device is 891323748
using lstat: the numeric identity of the device is 891323748
using stat: the numeric identity of the device is 891323748
using lstat: the numeric identity of the device is 891323748
例 2:
// Node.js program to demonstrate the
// stats.dev Property
// Accessing fs module
const fs = require('fs').promises;
// Calling stats.dev property from
// fs.Stats class
(async () => {
const stats = await fs.stat(
'./fs_stat_dev.txt');
//using stat synchronous
console.log("The numeric identity "
+ "of the device is " + stats.dev);
})().catch(console.error)
输出:
The numeric identity of the device is 891323748
注意:以上程序使用node filename.js命令编译运行，正确使用 file_path。
参考资料:https://nodejs . org/API/fs . html # fs _ stats _ dev
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