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var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
When a web page is loaded, the browser creates a Document Object Model of the page, which is an object oriented representation of an HTML document that acts as an interface between JavaScript and the document itself. This allows the creation of dynamic web pages, [13] because within a page JavaScript can:
As seen on page C‑2 of the newspaper. This code generates "page C‑2" just like the plain code "page C-2", but prevents a line break at the hyphen. However, like , the use of ‑ instead of "-" renders the source text harder to read and edit. Don't use it unless it is really necessary to avoid a line break.
Google Chrome DevTools, Console tab The "triangle" can be clicked to reveal some hidden info.. Click on the "Console" tab; Scroll to the bottom of the console and look for log entries in yellow and red.
Another example is the Ajax programming technique, where, for example, clicking a hypertext link may cause JavaScript code to retrieve the text for a new price quotation to display in place of the current one within the page, without re-loading the whole page. When the new text arrives back from the server, the JavaScript must identify the ...
The Browser Object Model (BOM) is a browser-specific convention referring to all the objects exposed by the web browser. [1] Unlike the Document Object Model , there is no standard for implementation and no strict definition, so browser vendors are free to implement the BOM in any way they wish.
To prevent an event from bubbling, developers must call the stopPropagation() method of the event object. To prevent the default action of the event to be called, developers must call the preventDefault() method of the event object. The main difference from the traditional model is that multiple event handlers can be registered for the same event.
Single line breaks in the source text are not translated to single line breaks in the output (if you want a single line break to appear in the rendered article, use a <br /> tag or {} template). However, single line breaks in the source do have certain effects: Within a list, a single line break starts either the next item or a new paragraph ...