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1. introduction to java script
This document provides an introduction to JavaScript. It explains that JavaScript is a scripting language that can be executed without compilation directly in web browsers. It distinguishes scripting languages from traditional programming languages in that scripts provide instructions to users while programs provide instructions to other programs. The document demonstrates how to include JavaScript code in an HTML page using <script> tags and covers basic JavaScript syntax like semicolons, quotes, and case sensitivity. It also shows how to use common JavaScript functions like alert and document.write.
1. introduction to java script
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- 2. What is aScripting Language? ● A scripting language is a computer language with a series of commands within a file that is capable of being executed without being compiled. ● The best example of a client side scripting language is JavaScript.
- 3. What is thedifference between a scripting language and a traditional programming language? "A script is what you give the actors. A program is what you give the audience." -- Larry Wall
- 4. The way JavaScriptworks...
- 5. How to getJavaScript into our page
- 6. Syntax Fun ● Eachstatement ends in a semicolon ● Whitespace doesn’t matter (almost everywhere) ● Surround strings of characters with double quotes(or single, both work, just be consistent). ● JavaScript, unlike HTML markup, is case sensitive
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- 8. Create an alert ●The browser gives you a quick way to alert your users through the alert function. Just call alert with a string containing your alert message, and the browser will give your user the message in a nice dialog box. ● alert really should be used only when you truly want to stop everything and let the user know something.
- 9. Write directly intoyour document ● You can use a function document.write(“your message”) to write arbitrary HTML and content into your page at any point
- 10. How do Iadd code to my page? <head> <title>My First JavaScript</title> </head> <body> <script> At this point you know that’s where you should put your code. </script> </body> </html>
- 11. ● You canplace your code in-line, in the <head> element ● you can add your code in-line in the body of the document OR ● put your code in its own file and link to it from the head ● Finally, you can link to an external file in the body of your page
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