You can read What is "this"? for a light introduction you should also study examples like this one, which shows a typical pattern of saving a this scope to a separate variable, then using that variable in nested functions so you can be sure you are applying functionality to the correct this scope. Confusion about this, in terms of what scope it applies to, and therefore if its value is what you intended.are defined in the correct scope, and you are not running into conflicts between items declared in different places (see Function scope and conflicts). Basic syntax and logic problems (again, check out Troubleshooting JavaScript).There are a number of common JavaScript problems that you will want to be mindful of, such as: If you are not already familiar with the basics of Troubleshooting JavaScript, you should study that article before moving on.
#Update javascript for chrome mac code#
Fixing general JavaScript problemsĪs we said in the previous article on HTML/CSS, you should make sure your code is working generally, before going on to concentrate on the cross-browser issues. We'll explore all these problems and more below.
These days, most cross-browser JavaScript problems are seen: Things have improved significantly since then modern browsers do a good job of supporting "classic JavaScript features", and the requirement to use such code has diminished as the requirement to support older browsers has lessened (although bear in mind that they have not gone away altogether). jQuery (or whatever library you are using) will then handle the differences in the background, so you don't have to.
#Update javascript for chrome mac how to#
see the code snippet in How to make an HTTP request) so developers only have to write one simple bit of code (see jQuery.ajax()). This is one of the main reasons why libraries like jQuery came into existence - to abstract away differences in browser implementations (e.g. Such incompatibility problems persisted well into the early 2000s, as old browsers were still being used and still needed supporting. Historically, JavaScript was plagued with cross-browser compatibility problems - back in the 1990s, the main browser choices back then (Internet Explorer and Netscape) had scripting implemented in different language flavors (Netscape had JavaScript, IE had JScript and also offered VBScript as an option), and while at least JavaScript and JScript were compatible to some degree (both based on the ECMAScript specification), things were often implemented in conflicting, incompatible ways, causing developers many nightmares.
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