javascript - Can't change html attribute with external script -


i've got little problem javascript. i'm trying learn how change attribute on page using setattribute(name, value), , nothing happens.

this test site's html code:

<!doctype html> <html> <head> <meta charset=utf-8" /> <title>test</title> </head>  <body> <div id="test" class="time"></div> <script src="js/script.js"></script> </body> </html>

this javascript code:

if(document.getelementbyid("test").hasattribute("class")) {     alert("got message");     var test = "test";     document.getelementbyid("test").setattribute("class", test); }

it's simple, should work, alert pops up, , when check source of page, nothing changes. honest - tried several different approaches , nothing worked. must really, stupid can't find it.

change classes

document.getelementbyid("test").classname = test;

add classes:

document.getelementbyid("test").classname += test;

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