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CHAPTER 2
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JavaScript Syntax
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What this chapter covers: Statements Variables and arrays Operators Conditional statements and looping statements Functions and objects
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This chapter is a brief refresher in JavaScript syntax, taking on the most important concepts.
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What you ll need
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You don t need any special software to write JavaScript. All you need is a plain text editor and a web browser. Code written in JavaScript must be executed from a document written in (X)HTML. There are three ways of doing this. You can place the JavaScript between <script> tags within the <head> of the document: <!DOCTYPE html > <html lang="en"> <head> <meta charset="utf-8"/> <title>Example</title> <script> JavaScript goes here... </script> </head> <body> Mark-up goes here... </body> </html> A much better technique, however, is to place your JavaScript code into a separate file. Save this file with the file extension .js. Traditionally you would include this in the <head> portion of the document by using the src attribute in a <script> tag to point to this file: <!DOCTYPE html> <html lang="en">
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CHAPTER 2 JAVASCRIPT SYNTAX
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<head> <meta charset="utf-8"/> <title>Example</title> <script src="file.js"></script> </head> <body> Mark-up goes here... </body> </html> However, the best technique is to place the <script> tag at the end of the document right before the closing </body> tag: <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"/> <title>Example</title> </head> <body> Mark-up goes here... <script src="file.js"></script> </body> </html> Placing the <script> tag at the end of the document lets the browser load the page faster (we'll discuss this more in 5, "Best Practices"). The <script> tags in the preceding examples don't contain the traditional type="text/javascript" attribute. This attribute is considered unnecessary as the script is already assumed to be JavaScript. If you d like to follow along and try the examples in this chapter, go ahead and create two files in a text editor. First, create a simple bare-bones HTML or XHTML file. You can call it something like test.html. Make sure that it contains a <script> tag that has a src attribute with a value like example.js. That s the second file you can create in your text editor. Your test.html file should look something like this: <!DOCTYPE html > <html lang="en"> <head> <meta charset="utf-8" /> <title>Just a test</title> </head> <body> <script src="example.js"></script> </body> </html> You can copy any of the examples in this chapter and write them into example.js. None of the examples are going to be particularly exciting, but they may be illuminating. In later chapters, we ll be showing you how to use JavaScript to alter the behavior and content of your document. For now, I ll use simple dialog boxes to display messages. Whenever you change the contents of example.js, you can test its effects by reloading test.html in a web browser. The web browser will interpret the JavaScript code immediately.
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CHAPTER 2 JAVASCRIPT SYNTAX
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Programming languages are either interpreted or compiled. Languages like Java or C++ require a compiler. A compiler is a program that translates the source code written in a high-level language like Java into a file that can be executed directly by a computer. Interpreted languages don t require a compiler they just need an interpreter instead. With JavaScript, in the context of the World Wide Web, the web browser does the interpreting. The JavaScript interpreter in the browser executes the code directly from the source. Without the interpreter, the JavaScript code would never be executed. If there are any errors in the code written in a compiled language, those errors will pop up when the code is compiled. In the case of an interpreted language, errors won t become apparent until the interpreter executes the code. Although compiled languages tend to be faster and more portable than interpreted languages, they often have a fairly steep learning curve. One of the nice things about JavaScript is that it s relatively easy to pick up. Don t let that fool you, though: JavaScript is capable of some pretty complex programming operations. For now, let s take a look at the basics.
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