我已经阅读了Node.js的文档，除非我错过了一些东西，否则它不会告诉某些操作中的参数包含什么，特别是fs.mkdir()。正如您在文档中看到的，它不是很多。
目前，我有这段代码，它试图创建一个文件夹或使用一个现有的:
fs.mkdir(path,function(e){
if(!e || (e && e.code === 'EEXIST')){
//do something with contents
} else {
//debug
console.log(e);
}
});
但我想知道这是正确的方法吗?检查代码EEXIST是知道文件夹已经存在的正确方法吗?我知道我可以在创建目录之前执行fs.stat()，但这已经是两次对文件系统的访问了。
其次，是否有一个完整的或至少更详细的Node.js文档，其中包含错误对象包含什么，参数表示什么等细节。
当前回答
你可以用这个:
if(!fs.existsSync("directory")){
fs.mkdirSync("directory", 0766, function(err){
if(err){
console.log(err);
// echo the result back
response.send("ERROR! Can't make the directory! \n");
}
});
}
其他回答
如果你想要一个快速而脏的眼线笔，使用这个:
fs.existsSync("directory") || fs.mkdirSync("directory");
您可以使用File System模块完成所有这些操作。
const
fs = require('fs'),
dirPath = `path/to/dir`
// Check if directory exists.
fs.access(dirPath, fs.constants.F_OK, (err)=>{
if (err){
// Create directory if directory does not exist.
fs.mkdir(dirPath, {recursive:true}, (err)=>{
if (err) console.log(`Error creating directory: ${err}`)
else console.log('Directory created successfully.')
})
}
// Directory now exists.
})
您甚至不需要检查目录是否存在。下面的代码还保证目录已经存在或已创建。
const
fs = require('fs'),
dirPath = `path/to/dir`
// Create directory if directory does not exist.
fs.mkdir(dirPath, {recursive:true}, (err)=>{
if (err) console.log(`Error creating directory: ${err}`)
// Directory now exists.
})
您还可以使用fs-extra，它提供了许多常用的文件操作。
示例代码:
var fs = require('fs-extra')
fs.mkdirs('/tmp/some/long/path/that/prob/doesnt/exist', function (err) {
if (err) return console.error(err)
console.log("success!")
})
fs.mkdirsSync('/tmp/another/path')
文档地址:https://github.com/jprichardson/node-fs-extra#mkdirsdir-callback
你可以用这个:
if(!fs.existsSync("directory")){
fs.mkdirSync("directory", 0766, function(err){
if(err){
console.log(err);
// echo the result back
response.send("ERROR! Can't make the directory! \n");
}
});
}
下面是我用来创建目录的ES6代码(当它不存在时):
const fs = require('fs');
const path = require('path');
function createDirectory(directoryPath) {
const directory = path.normalize(directoryPath);
return new Promise((resolve, reject) => {
fs.stat(directory, (error) => {
if (error) {
if (error.code === 'ENOENT') {
fs.mkdir(directory, (error) => {
if (error) {
reject(error);
} else {
resolve(directory);
}
});
} else {
reject(error);
}
} else {
resolve(directory);
}
});
});
}
const directoryPath = `${__dirname}/test`;
createDirectory(directoryPath).then((path) => {
console.log(`Successfully created directory: '${path}'`);
}).catch((error) => {
console.log(`Problem creating directory: ${error.message}`)
});
注意:
In the beginning of the createDirectory function, I normalize the path to guarantee that the path seperator type of the operating system will be used consistently (e.g. this will turn C:\directory/test into C:\directory\test (when being on Windows) fs.exists is deprecated, that's why I use fs.stat to check if the directory already exists If a directory doesn't exist, the error code will be ENOENT (Error NO ENTry) The directory itself will be created using fs.mkdir I prefer the asynchronous function fs.mkdir over it's blocking counterpart fs.mkdirSync and because of the wrapping Promise it will be guaranteed that the path of the directory will only be returned after the directory has been successfully created
