javascript - The main difference between internal js file and external js file -


is there different between include external js file , write down javascript in html page.

case 1

test.html

<html>     <head>         <script type="text/javascript" src="test.js"></script>     </head>     <body>     </body> </html>

test.js

alert('aaa');

case 2

test.html

<html>     <head>         <script>             alert('aaa');         </script>     </head>     <body>     </body> </html>

case 1 execute more faster case2 if memory services me right. not sure. moreover, cannot find relative documents or articles support ideal. may me?

case 1 is slower @ first, because needs second request script, there little overhead.

however, browser cache javascript file, if have multiple pages share same script, case 2 more efficient, because subsequent pages, browser has cached script , doesn't need download again.

also, browsers allow opening 2 connections same server, may download page , script simultaneously on first request, although depends on size of page , script, server, client , internet properties (latency , speed) solution faster.


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