Download Advanced Game Design with HTML5 and JavaScript by Rex van der Spuy PDF

April 11, 2017 | Javascript | By admin | 0 Comments

as a comment. Browsers that are JavaScript-enabled recognize and run a JavaScript that is contained within an HTML comment. Older browsers simply ignore the JavaScript, thinking that the script is a comment. The following listing illustrates how to hide your JavaScript from older browsers.

That’s what null means. Null is the absence of any value. You might wonder why you’d need to use such a value, but as you’ll see when you start writing sophisticated JavaScripts, there will be times when you need to use a variable (a placeholder for a value) to represent no value (null) until your JavaScript assigns a value to the variable. For example, you probably want to assign null to the variable used for a customer’s first name until the customer enters his or her name on the form. Objects You learned about objects in Chapter 1.

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