文字列がHTMLのタグ名かどうか調べる - 素人がプログラミングを勉強していたブログ
var isKnownTagName = function() { var cache = {}; return function(tag_name) { if (tag_name in cache) { return cache[tag_name]; } var ret; try { ret = document.createElement(tag_name).constructor != HTMLUnknownElement; } catch(error) { ret = false; } return cache[tag_name] = ret; } }(); isKnownTagName('a'); // true isKnownTagName('xxx'); // false isKnownTagName('&%$'); // false
The Ultimate getElementsByClassName - Robert's talk
New version released, with major updates Tuesday, May 27th, 2008. NOTE: The code below is outdated. A completely rewritten version of getElementsByClassName has been released, taking into account all new available web browser features and possibilities, to offer you the best performing and most flexible implementation. Read about the new version or go and download it straight away. Updated on Tues
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http://getelementsby.com/
