JS gets elements using getElementById (), Getelementsbyname (), getElementsByTagName () usage and differences

Web standards can access any of the tags in Documnent through getElementById (), Getelementsbyname (), and getElementsByTagName (): 1 getElementById ("ID ") getElementById () can access a specific element in the Documnent, as the name implies, by

js--How to discriminate null undefined

The information collected is as follows:1. Judge undefined:? 1234 vartmp = undefined; if(typeof(tmp) == "undefined"){ alert("undefined"); } Description: typeof returned a string of six possible types: "Number",

PHP Coding Specifications and recommendations

php coding specifications and recommendations # # # Encoding Specification-PHP code files must start with the ```Not ending```-PHP code files must be encoded with UTF-8 without BOM.```Example sublime, setting increased, "show_encoding": True```-the

ASP. Npoi Export the xlsx format file, open the file "Excel has completed file-level validation and repair." Some parts of this workbook may have been repaired or discarded "

Npoi Export the xlsx format file, the following conditions can occur:Click "Yes":The export code is as follows:/// ///write DataTable data to Excel and download/// /// DataTable /// file name /// Template Path ///

Jsoup Parsing HTML

Parsing and traversing an HTML documenthow to parse an HTML document :The code is as follows:String html = "first parse"+ "parsed HTML into a doc.";Document doc = jsoup.parse (HTML);Its parser can do everything possible from the HTML document you

Linux file archiving, compression and upload, download

1. File archivingDefined: File archiving, which is to turn multiple files into an archive file 2.Tar C # #创建 -j XZ Format Compression F Specify the archive file name T Display the

jquery Operations Select Dropdown box multiple methods (check, value, assignment, etc.)

Query gets the text and value of the Select selection: Syntax Explanation: 1. $ ("#select_id"). Change (function () {//code ...}); Adds an event for select, triggering 2 when one of the items is selected. var checktext=$ ("#select_id"). Find

Using Commons-fileupload to implement file upload analysis

Turn from: Use Commons-fileupload to implement file uploadJ AVA Web developers can use the Apache File Upload component to receive browser-uploaded files, which are composed of multiple classes, but for Java Web developers who use the component to

Compile and install httpd-2.4.28 in CENTOS6

Method One,1, install the development Environment Package group and related packages:Yum Groupinstall "Development Tools"Yum Install Pcre-devel openssl-devel expat-devel2. Download the source code and unzip it:RZ Import Source CodeTar xvf httpd-2.4.2

HTTPS free certificate, free SSL certificate, freessl.org request a variety of free certificates

With the development of the Internet, it has been deeply in all aspects of people's lives, it can be said that we are inseparable from the Internet. In the face of human dependence, Internet security is increasingly important, personal privacy is

Bzoj 1030: [JSOI2007] Text generator

1030: [JSOI2007] Text generator time limit:1 Sec Memory limit:162 mbsubmit:5204 solved:2147[submit][status][discuss]descriptionJsoi to the players zyx a task, the production of a "text generator" computer software: The user of the software is some

Fatal error:call to undefined function curl_init () workaround

Problem Description:In the Windows SERVER 2012RC OS, PHP 5.6.3 Environment, set up the PHP runtime environment. But in the callCurl_init ()Method is an error.Check, php.ini in the Extension=php_curl.dll in front of the semicolon has been removed,

Vue.js Common Instruction Summary (v-if//v-show//v-else//v-for//v-bind//v-on, etc.)

Sometimes too many instructions will cause the mistake, remember the problem, so this article in the memory of the time will be interspersed with memory, cross-alignment, not easy to make mistakes.This article mainly tells about six

Asp. NET no magic--asp.net MVC IoC

The previous article describes how MVC creates a controller through Controllerfactory and Controlleractivator, And how the controller through Controllerbase this template to complete the expansion of the function and business execution. This series

"Learning Notes" urllib2 and use of cookies

Because of some relationship, I need to discard the lovely requests library and then use URLLIB2, have to say, the function, or requests powerful Ah, cookie,session,put,option and so on,,,,Well, back to the point, due to functional needs, I need to

ANGULAR4 Background Management System Building (10)-a generic component that can upload files across domains

Write very slowly, unconsciously this is the tenth article. But I have so many other things that I can only write. Now ANGULAR4 or angular2 popular way to upload is ng2-file-upload. It has a very powerful function. But I'm not configured to be able

What is the difference between HTTPS and HTTP? How to convert HTTP to HTTPS

I do not know if you have noticed the HTTP part of the input URL, when you open the site to operate sometimes automatically jump to HTTPS format, this is why? What is the difference between HTTP and HTTPS? How to convert HTTP to HTTPS, for these

Configure a flexible configuration file using Web. config transformation

When publishing an ASP, the Web. config for the development environment and publishing environment is often different, such as ConnectionString. If you often have a publishing requirement, you often need to modify the Web. config file, which is

The method of judging null, undefined and nan in JS

wrote a str = "s" + +;Then nan appeared for a while.The information collected is as follows:1. Judge undefined:? 1234 vartmp = undefined; if(typeof(tmp) == "undefined"){ alert("undefined"); } Description: typeof

Asp. NET no magic--asp.net MVC route matching and processing

The route of ASP. NET MVC is a core of MVC application and the entry of MVC application processing, as a developer, under normal circumstances just need to define the entity, business logic, and then in the MVC controller to call, view to show,

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