node js try catch example

This article mainly introduces the functions and examples of JS exception handling, that is, try .. catch statement. For more information, see the following common sense: when a JavaScript script is executed in a browser, when a script error occurs and you do not manually capture exceptions, he will display a yellow exclamation mark under the browser. this is nor

The first common sense is that in the browser to execute the JS script, when there is a script error, and you do not manually do the exception capture, he will appear in the browser yellow exclamation mark, it is normal, this is not the most important, most importantly, the error line below all the JS code will be stopped execution, This is what we do not want to see, so, for their own written, unsure of th

Grammar:try{ //Run code here} catch(err) { //handling errors here}Note: Try...catch uses lowercase letters. Uppercase letters make an error.In JavaScript you can use Try...catch to do exception handling. For example:try {foo.bar ();}

JS error handling try .. catch use Try... catch is a very practical and safe method for capturing errors.The usage is as follows.Example reference:Http://www.cnblogs.com/newblue/archive/2006/12/28/606100.html// Exception handling test in different browsers

This example detects the value of the input variable. If the value is wrong, an exception (error) is thrown. Catch catches this error and displays a custom error message:Reference: JavaScript errors-Throw, Try, and CatchJs--try Catch Throw

In JavaScript you can use Try...catch to do exception handling. For example:try {foo.bar ();} catch (E) {alert (e.name + ":" + E.message);}The system anomalies we may get at the moment mainly include the following 6 types: Evalerror: Raised when a error occurs executing code in eval () Rangeerror: Raised when a numeric variable or parameter are outsi

Trythrownew Error ("ASDASDASD"catchthrow New Error ("ASDASDASD"In JavaScript you can use Try...catch to do exception handling. For example:Trycatch+ ":" + e.message);}The system anomalies we may get at the moment mainly include the following 6 types: Evalerror: Raised when a error occurs executing code in eval () Rangeerror: Raised when a numeric variable or parameter are outside of its valid r

This article mainly introduces a simple node. js server example. This article implements a simple helloworld example and shows how to run this server, for more information, see the following example: hello world. It seems that the first section of each language tutorial w

JS: Simple Method example for getting node elements, js node element example This example describes how to obtain node elements in JavaScrip

Example of using Node. js to implement RESTful API, node. jsrestful Basic RESTful concepts REST (Representational State Transfer) describes an architecture-style network system that first appeared in Roy Fielding's doctoral thesis in 2000. In the REST service, application status and functions can be divided into variou

This article mainly introduces how to use Meteor with Node. js Code example of real-time chat application, Node. as an asynchronous framework, js is used to compile real-time applications. For more information, see Derby. the framework for

This article mainly introduces Node. examples of simple web page capturing functions implemented by js. This article uses libraries such as PhantomJS and node-phantomjs to implement these functions. For more information, see the following: web page capturing is a well-known technology, however, there are still a lot of complexities. Simple Web crawlers are still

successfully"); Res.end ();}). Listen (8081);Next Mysql.js File connection database:Exports.reg =function(action,name,pass,email) {varMySQL = require (' MySQL '); varConnection =mysql.createconnection ({host:' localhost ', User:' Root ', Password:' 123456 ', Port:' 3306 ', Database:' Test ', }); Connection.connect (); varModsql = "INSERT into user (Name,pass,email) VALUES ('" "+name+" ', ' "+pass+" ', ' "+email+" ') "; Connection.query (Modsql,function(err, result) {if(Err) {Console

This article mainly introduces a simple node. js server example. This article implements a simple helloworld example and shows how to run this server, for more information, see the following example: hello world. It seems that the first section of each language tutorial w

This article mainly introduces Node. example of calling the mysql stored procedure in js. this article passes the test in the windows environment. This article also provides examples of creating a database, inputting data, creating a stored procedure, and calling a stored procedure, for more information, see the example