纯JS function getElementsByClass

最新推荐文章于 2017-12-15 13:05:34 发布

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最新推荐文章于 2017-12-15 13:05:34 发布

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原文链接：http://www.cnblogs.com/rayy/archive/2010/01/23/4399760.html

本文介绍了一个JavaScript函数getByClass，该函数通过指定的类名和标签名在给定的根节点中查找所有匹配的元素，并返回这些元素的数组。

/**
* rootNode          the root node to be checked on,
*                   for example 'document'
* classToSearch     className to be matched
* tagName           elements name to be searched between,
*                   '*' for all elements in 'rootNode'
* returns           an array contains all elements matched
*/
function getByClass(rootNode, classToSearch, tagName) {
var elementsToReturn = new Array();
var elementList = rootNode.getElementsByTagName(tagName);
var nLen = elementList.length;
var pattern = new RegExp("" + classToSearch + "");
for (var i = 0; i < nLen; i++) {
   if (pattern.test(elementList[i].className)) {
    elementsToReturn[elementsToReturn.length] = elementList[i];
   }
}
return elementsToReturn;
}

转载于:https://www.cnblogs.com/rayy/archive/2010/01/23/4399760.html