alert is not defined node js

The console. time Method in node. js is used in node. js scenarios. Method description: Start Time, which corresponds to console. timeEnd and records the time period. Syntax: Copy codeThe Code is as follows:Console. time (labe

The console. timeEnd method in node. js is used in node. js scenarios. Method description: Completion time: the time spent between console. time and console. timeEnd. Syntax: Copy codeThe Code is as follows:Console. timeEnd (l

Definition: node. js is a JavaScript running platform running on the server side using the Google V8 engineFeatures: 1. asynchronous I/O (non-blocking I/O) 2. Event-drivenWhat is asynchronous I/O (non-blocking I/O)?To understand what asynchronous I/O is (non-blocking I/O), y

For example:if (!MYVAR01) alert ("Error occurred");The code has an exception directly because the variable MYVAR01 does not declare if ("undefined" = = typeof MyVar01) alert ("Error occurred");That's not going to happen.and: Var MyVar01; if (undefined = = MyVar01) alert ("Error occurred");The code runs correctly if ("undefined" = typeof MyVar01)

The console. assert method in node. js is used in node. js scenarios. Method description: This method is the same as assert. OK. If the expression evaluates to false, an AssertionError will be thrown along with the message) Syn

Undefined errors are often encountered in js Code. The following section describes why such errors occur and how to handle them, if a variable is declared through var but the variable is not initialized in js, the value of the variable is undefined. In this case, determine w

Node. js is suffixed with. html and node. jsejs when the ejstemplate is used. . 1. Define ejs in the header of app. js: Copy codeThe Code is as follows:Var ejs = require ('ejs '); 2

Node. js is a simple example of checking whether a port is occupied. node. jsport Preface In network technology, a Port has two meanings: one is a physical Port, for example, ADSL Modem, Hub, switch, router

Original address: http://blog.csdn.net/ywl570717586/article/details/53130863There is always an error in handling the onclick function in the HTML tag today: uncaught Referenceerror:dosave is not defined (...)Looking for a long while did not find the wrong, and finally found that I was wrong, the correct wording as follows:Html:[HTML]View plain copy inpu

Today, processing the onclick function in HTML tags always complains: uncaught referenceerror:dosave is not defined (...) Looking for a long time did not find fault in where, finally found that I am writing wrong, the correct wording is as follows: Html: Js: Dosave = function () {

In node. js development, the Node Supervisor is used to modify the monitoring file and automatically restart the application. In the development or debugging of Node. when you modify a js application, you always need to press CTRL

In node. js (express), Jcrop is used to cut and upload images. node. jsjcrop Requirements To put it simply, you need to upload an avatar and save the cropped parts as the Avatar. Step 1: select the image: Step 2: Display and crop in the pop-up window: Step 3: click "save" to upload the file to the server. Implementat

JavaScript you don't Know (middle)--ToBooleanThe values in JavaScript can be divided into the following two categories:1. A value that can be coerced into a type that is False2. Other (values that are cast to true for the coercion type)false Values ---the following are the false values defined in the ES specification of JS: Undefined Null False

There is a document that defines a function func (), while embedding an IFRAME in the document, the method of calling the parent window in this iframe: Parent.func (), originally I thought this function's environment is in this IFRAME itself inside , the test found that although this function was called in the IFRAME, the operating environment is still in the par

Hello.jsfunction Hello () { alert (' hello ');}Hello.htmlDOCTYPE HTML>HTMLLang= "en">Head> MetaCharSet= "UTF-8"> title>Titletitle> ScriptID= "Hello"src= "Hello.js">Script>Head>Body>Body>Script>hello (); if (-[1,]) {document.getElementById ('Hello'). Remove (); } Else{document.getElementById ('Hello'). RemoveNode (true); } setTimeout (function() {hello (); }, +);Script>HTML>Will execute: Chrome,firefox,ie 11,operaNot performed: SafariTest t

One day, I hurried off from work and forced to close DW. That was the case later. The pop-up dialog box always says c: \ ProgramFiles \ Macromedia \ Dreamweaver 8 \ Configuration \ shared \ common \ scripts \ dwscriptsextdata. JS errors, resulting in the inability to copy and paste. At first, I thought the JS file was damaged, and it took more than an hour to download and replace it. Then we found out the

In Linux, node. js is used to extract the content of Word (doc/docx) and PDF text, and node. jsdocx Preface To create a full-text search engine, you need to extract documents such as word/pdf. There are some open source solutions such as xpdf for pdf. However, Word documents are more complex. Extract PDF text XPDF

The http. get method in node. js is described as follows: node. jshttp. get Method description: Most requests do not contain GET requests of the Request body. Node. js provides a simpler method for requests. The difference between

The http. request Method in node. js is described in node. jsrequest. Method description: The function room acts as a client to initiate a request to the HTTP server. Syntax: Copy codeThe Code is as follows:Http. get (options, callback) Because this method belongs to the htt

The http. response. end method in node. js is described in node. jshttp. get. Method description: End the response and tell the client that all messages have been sent. When all the content to be returned is sent, the function must be called once. If you do not call this fun