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Apart from allowing you insert js variables into a script tag when written like document.write('<scr' + 'ipt src= what are the pros/cons of this vs a normal <script src=> tag?

I'm mainly asking with regard to speed but interested in the whole story.

Thanks Denis

Apart from allowing you insert js variables into a script tag when written like document.write('<scr' + 'ipt src= what are the pros/cons of this vs a normal <script src=> tag?

I'm mainly asking with regard to speed but interested in the whole story.

Thanks Denis

  • javascript
Share Improve this question edited Feb 10, 2010 at 11:26 Quentin 945k132 gold badges1.3k silver badges1.4k bronze badges asked Feb 10, 2010 at 11:23 Denis HoctorDenis Hoctor 2,6074 gold badges36 silver badges51 bronze badges 4
  • I don't see any question – Andreas Bonini Commented Feb 10, 2010 at 11:24
  • Stackoverflow does this: document.write('<s'+'cript lang' + 'uage="jav' + 'ascript" src="http://ads.stackoverflow./a.aspx? – Skilldrick Commented Feb 10, 2010 at 11:31
  • Does this question help? stackoverflow./questions/236073/… – Paul D. Waite Commented Feb 10, 2010 at 11:36
  • @Paul. not really as I get why we split it. What I'm wondering is if I have a choice to split it and use a js variable or not split it and use a serverside variable, apart from reduced code bloat do I get anything inway of a speed increase or otherwise by going the server option? – Denis Hoctor Commented Feb 10, 2010 at 11:51
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3 Answers 3

Reset to default 8

There is no need for '<scr'+'ipt'. There is need for '<\/scr'+'ipt>'. Because HTML interpreter has no need to understand Javascript, so it will treat everything between <script>...</script> as the text, and won't care var a='</script>'; is a string literal Javascript, it will consider it the closing tag for <script> and regard the remainder of the script text as plain (erroneous) HTML.

edit: corrected per David's suggestion

I assume this is to gain non blocking javascript loading.

For this i suggest looking at Steve Souders posts about the subject. http://www.stevesouders./blog/2009/04/27/loading-scripts-without-blocking/

The LABjs library solves this in a pretty nifty way. http://labjs./

Also it seems newer browsers are beginning to load things parallel by default http://www.stevesouders./blog/2010/02/07/browser-script-loading-roundup/

Other than those? There aren't any.

(Incidentally, splitting a script tag in a JS string into a pair of concatenated strings is pointless bloat)

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