node js error class

Node. js implements port forwarding and node. js port forwarding This article shares the node. js port forwarding implementation code for your reference. The specific content is as follows: #!/sbin/

This article mainly introduces Node. how to Use the domain module in js exception handling. The memory leakage problems are mentioned at the end of this article. It is worth noting that if you need a friend, you can refer to the domain module provided by NodeJS, it can simplify Exception Handling for asynchronous code. Before introducing this module, we need to first understand the concept of "domain. Simpl

HandlingReq.on (' Error ',function(err) {if(err.code== "Econnreset") {Console.log (' [Downloadpic]socket port connection timed out. ‘); Console.log (ERR); }Else{Console.log (' [Downloadpic] Request error occurred, Err.code: ' +Err.code); Console.log (ERR); } }); //End of Requestreq.end ();}//--------------------------------------//Program Entry//--------------------------------------fun

Details about Node. js serialization Process Control and node. js serialization Serial task: the task that needs to be followed is called a serial task. You can use the callback method to execute several asynchronous tasks in sequence. However, if there are too many tasks, you must organize them. Otherwise, excessive c

This article mainly introduces Node. methods for securely calling system commands in js (to avoid injection security vulnerabilities). This article describes the security issues that may occur when connecting strings, for more information about how to use Node, see this article. js calls system commands to avoid common

Detailed explanation of Node. JS file system parsing instances, node. js instances 1. Node. js File System Var fs = require ("fs ") 2. asynchronous and synchronous Functions that read file content include asynchronous fs. read

Node. js and C can traverse the largest file in the folder and output the path, size, and node. js path. Node. js Traverse the maximum file in the folder and output the path, size Implementation Code: /* Traverse the maximum file

');Var buffer = new Buffer (8 ); Var mineType = mime. lookup (new_file_path );Var fileType = mime. extension (mineType ); Fs. readSync (fd, buffer, 0, 8, 0 );Var newBuf = buffer. slice (0, 4 );Var head_1 = newBuf [0]. toString (16 );Var head_2 = newBuf [1]. toString (16 );Var head_3 = newBuf [2]. toString (16 );Var head_4 = newBuf [3]. toString (16 );Var head_iden = head_1 + head_2; Var tempFileType = FILE_TYPE_CONFIG [head_iden];If (! TempFileType ){Head_iden + = head_3; TempFileType = FILE_TY

) {console. log (error);} else {console. log (result );} // Close the database link to db. close () ;}); // mongoose findvar criteria = {title: 'emtity _ demo_title '}; // query condition var fields = {title: 1, content: 1, time: 1}; // The Field var options ={}; mongooseModel. find (criteria, fields, options, function (error, result) {if (error) {console. log (

By default, the transmission process of Nodejs read/write stream is transmitted in the form of buffer, unless you set other encoding formats for it. For details, refer. The stream in Node. js is very powerful. It provides support for processing potential large files and abstracts data processing and transmission in some scenarios. Because it is so easy to use, we often write some tool functions/libraries ba

This article mainly introduces node in detail. key code for js port forwarding. If you are interested, refer to this article to share with you node. js port forwarding implementation code for your reference. The specific content is as follows: #!/sbin/node var net = requir

This article describes how to use socket in Node. js to create private chat rooms and public chat rooms. For more information, see: In the previous article, we will introduce the use of Angular, Nodejs, and socket. i/O builds chat rooms and multi-user chat rooms. This article continues to introduce Node. use socket in js