General presentation of HTML page

Hello

Two very simple questions about the way that you layout a page "general" (html or php)

1. in terms of links "script" at the top of the page like this.

"< script src="scripts/jquery-1.7.2.min.js "type =" text/javascript"> < / script >

     <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

Did you put all the links that you usually use at the top of each page, even if you can't use them on this page?

(If you do not have to worry about "did I put that point up there?")

2. where do you put the javascript scripts?

I saw them put ALL of the head, the upper body to the lower body.

I read somewhere that ' all javascripts should be placed above the < / body > line.

Is there a consensus on these two issues?

Thanks in advance.

If you do not use a script, it is best not to include in the page. However, if it is a script like jQuery you use on many pages, there is probably little wrong in adding because the script will be cached by the browser, so it does not need to be downloaded again.

For a long time, councils were to put all the JavaScript links in theof a page. However, the consensus has shifted because JavaScript blocks other activity of browser. Everything stops while the browser waits for the script to download and be analyzed. With a lot of scripts, this happens so fast that it makes very little difference. However, anything that slows down the page loading should be avoided.

Why jQuery and similar scripts are now commonly placed just before the closing tag is because they must wait until the ISP (DOM, the Document Object Model) has been loaded before that they can manipulate elements on the page. In some cases, however, the JavaScript code is necessary prior to the loading of the page. For example, the HTML5 shiv must be in theof the page. Otherwise, IE 8 and older does not apply your styles of new HTML5 elements. In addition, mobile jQuery scripts must be loaded before theof the page.

In short, it depends on what the script is intended. If she will not be executed until the DOM has been loaded, put it before the closingtag. If she fills a function at an earlier stage, put it in theor in the appropriate location in theof the page.

Tags: Dreamweaver

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