En de volgende wonderbaarlijke ontdekking:
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| document.getElementsByClassName = function (needle)
{
var s = document.getElementsByTagName('*'), i = s.length, e, r = [];
var re = new RegExp('(^|\\s)' + needle + '(\\s|$)');
while (i--)
{
e = s[i];
if (e.className && re.test(e.className)) r.push(e);
}
return r;
}
|
let op hoe ik hier e = s[i] gebruik in plaats van e = s.item(i)
benchmarks:
Firefox: 250 milliseconden
IE: 80 milliseconden
Opera: 4150 milliseconden
mixed approach lijkt hier dus toch de beste oplossing:
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| document.getElementsByClassName = function (needle)
{
var s, i, r = [], l = 0, e;
var re = new RegExp('(^|\\s)' + needle + '(\\s|$)');
if (navigator.userAgent.indexOf('Opera') > -1)
{
s = [document.documentElement || document.body], i = 0;
do
{
e = s[i];
while (e)
{
if (e.nodeType == 1)
{
if (e.className && re.test(e.className)) r[l++] = e;
s[i++] = e.firstChild;
}
e = e.nextSibling;
}
}
while (i--);
}
else
{
s = document.getElementsByTagName('*'), i = s.length;
while (i--)
{
e = s[i];
if (e.className && re.test(e.className)) r[l++] = e;
}
}
return r;
}
|
crisp wijzigde dit bericht 04-04-2005 01:04 (43%)
Door: 
