WebMar 15, 2024 · The readFileSync by default returns the content in the Buffer format. To get the content in normal string format, we need to pass the utf8 encoding as a parameter. Change the code. // import the fs module const fs = require ( "fs" ); // read file synchronously const readData = fs. readFileSync ( "./data.txt" , "utf8" ); console .log ( readData ); WebJan 12, 2024 · readFileSync() is synchronous and blocks execution until finished. These return their results as return values. readFile() are asynchronous and return immediately while they function in the background. You pass a callback function which gets called when they finish. let's take an example for non-blocking.
Difference between readFile() and readFileSync() - Stack Overflow
WebApr 10, 2024 · 这个错误提示是由于在 ReadCode 函数中，使用了字符串拼接符号 '+' 连接了读取文件的返回值和一个换行符号，导致返回值不是预期的字符串类型，而是一个包含了换行符号的 Buffer 对象。方法读取文件，并将返回值的编码设置为 'utf-8'，以确保返回值是一个字符串类型，可以正常进行字符串拼接。 Webfs.readFileSync(path[, options]) fs.readlink(path[, options], callback) fs.readlinkSync(path[, options]) fs.readSync(fd, buffer, offset, length, position) fs.realpath(path[, options], callback) fs.realpathSync(path[, options]) fs.rename(oldPath, newPath, callback) fs.renameSync(oldPath, newPath) fs.rmdir(path, callback) fs.rmdirSync(path) eagletwe.com
nodejs 回调错误Callback must be a function. Received undefined
WebJul 28, 2024 · Here’s an example using readFileSync: const fs = require('fs'); try { const file = fs.readFileSync('notes/index.txt'); // pass in the path to the file console.log(file.toString()) // it returns a buffer, convert it back to string } catch (e) { console.log(e) // logs any error encountered with reading the file } Here’s an example using readFile: WebMar 16, 2024 · Our list () function returns a copy of the array that’s used by the class. It makes a copy of the array by using JavaScript’s destructuring syntax. We make a copy of the array so that changes the user makes to the array returned by list () does not affect the array used by the Todos object. Note: JavaScript arrays are reference types. WebApr 11, 2024 · Node.js 文件系统（fs 模块）模块中的方法分成两类，一类是同步，另一类是异步，例如读取文件内容的函数有异步的 fs.readFile() （其中回调函数是异步方法） 和同步的fs.readFileSync()。 异步的方法函数... eagle turkey