addition operation in javascript

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1) Intro Not long ago I set up a technology group in a MM asked a question like this, she posted the code as follows: var a = 1;function hehe (){Window.alert (a);var a = 2;Window.alert (a);}Hehe (); The results of the execution are as follows:

Starting with JDK 6, Java is already bundled with the JavaScript engine, which is based on Mozilla's rhino. This feature allows developers to embed JavaScript code in Java and even call Java from embedded JavaScript. In addition, it provides the

Starting with JDK 6, Java is already bundled with the JavaScript engine, which is based on Mozilla's rhino. This feature allows developers to embed JavaScript code in Java and even call Java from embedded JavaScript. In addition, it provides the

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

Go1. What is the JavaScript parsing engine?In short, the JavaScript parsing engine is a program that can "read" JavaScript code and accurately give the result of the code running. Let's say that when you write var a = 1 + 1 , so a piece of code that

[JavaScript] addition, deletion, modification, and query of webpage nodes, javascript nodes I. Basic Concepts This part is the so-called "html dom". The so-called html dom is the Web page loading rule. It is a rule, which is also the basic formula

JavaScript = operation details, javascript Operation Details As you know, = in JavaScript is a complicated operation. Its operation rules are very strange and easy to make mistakes, making it one of the "worst features" in JavaScript. After

JavaScript single threadThe JavaScript language runs in a browser in a single thread. Speaking of a single thread, you have to start with the operating system process. Both processes and threads are operating systems. A process is an execution

From: http://student.csdn.net/space.php? Uid = 45106 & Do = Blog & view = me Chapter 2 Some of the essential JavaScript features bring much more trouble than they do. Some of these features may cause portability problems due to imperfect