function getElementsByClass(searchClass) { if (document.all) { var classElements = new Array(); var allElements = document.all; for (i = 0, j = 0; i < allElements.length; i++) { if (allElements[i].className == searchClass) { classElements[j] = allElements[i]; j++; } } } else if (document.getElementsByTagName) { var classElements = new Array(); var allElements = document.getElementsByTagName("*");
![getElementsByClass(IE,Firefox対応版) - 技術情報メモ](https://cdn-ak-scissors.b.st-hatena.com/image/square/df3a50c14b465108d37d0f484920317dd74971fb/height=288;version=1;width=512/http%3A%2F%2Fu.xgoo.jp%2Fimg%2Fsns%2Fblog.png)