HTML TUTORIAL 8 JAVASCRIPTS

 

• && is an example of a logical operator.
• The For loop allows you to create a group of commands that will be executed a set number of times through the use of a counter.
• The code [1]=”Monday” is part of an array.
• Parameters are the values used by a function.
• Operators are elements that perform actions within the expression.
• The symbols + - * and % are operators.
• The following commands will create a variable named “Month”: var Month; var Month = “December”; and Month = “December”.
• You declare a variable in JavaScript using the var command.
• ‘Hello’ is an acceptable string value.
• A variable that is null has no value at all.
• Creating a JavaScript variable also is known as declaring a variable.
• Variable names cannot contain spaces.
• Integer is not a valid JavaScript data type.
• A named element in a program that is used to store and retrieve data is a variable.
• You should use indented text where appropriate to make the code easier to read and follow.
• Each JavaScript command line ends with a semicolon to distinguish it from the next command line in the program.
• The document.write() and document.writeln() methods reflect the object-oriented nature of the JavaScript language.
• The JavaScript command that displays text on a Web page is document.write(“text”).
• To avoid an older browser’s failure to support JavaScript, you can hide the script using comment tags.
• You indicate a comment in JavaScript code using the // symbols.
• The default language used with the <script> tag is JavaScript.
• When JavaScript code appears in an HTML file, you indicate it using the <script> tag.
• JavaScript is a subset of Java with several important differences, including the ability to work without needing to compile a program.
• Windows, UNIX and Macintosh are all operating systems that can run Java.
• HotJava acted as a Java interpreter, which means that it was able to interpret a Java program and run it for the user.