javascript if and else both executed

The strange if-else, javascriptif-else in javascript Recently, my head is a bit dizzy. When I write the if-else code in javascript, I actually added conditions to else. The Code is as follows: Run this script in IE9 and chrome, and no js error is

ArticleDirectory Javascript Introduction How to Implement Javascript Where to place Javascript Javascript statements Javascript Variables Javascript Operators Javascript branch statement Javascript message box

Directory1 History 2 clarifying misunderstandings 3 basic concepts 4 features 5 different from Java 6 development toolsHistoryProbably in 1992, a company called Nombas began developing an embedded scripting language called C-minus (C-minus-minus, or

1th Chapter Essence Some of the features of JavaScript feature a lot more trouble than they are worth. Some of these features are because the specification is so imperfect that it can cause portability problems; Some features can lead to the

We often see some data types in javascript, such as "undefined", "boolean", and "string, this article will help you learn the basic JavaScript data types, value types, and reference types. For more information, see this article, four basic data

Summary of little knowledge about JavaScript performance optimization, and javascript Performance Optimization With the development of the network, network speed and machine speed, more and more websites use a variety of client technologies. Ajax is

Conditional statements are used to perform different actions based on different conditions. Conditional statement Usually when writing code, you always need to perform different actions for different decisions. You can use conditional statements

Analyze the JavaScript script loading and code execution sequence in the browser, and analyze the javascript This article mainly analyzes the execution sequence of JavaScript scripts in HTML based on several methods of Introducing JavaScript to HTML

1. JavaScript overview 2. JavaScript Introduction method 3. JavaScript Language Specification 4. JavaScript Language Basics 5. JavaScript data type 6. JavaScript operators 7. JavaScript Process Control 8. JavaScript

Mustang Script Engine JSR 233 has designed a set of scripting language APIs for Java. This API provides interfaces for calling various script language engines in Java programs. Any scripting engine that implements this interface can be called in a