class_names.js

来自「Web标准的创造力-Web.Standards.Creativity.pdf」· JavaScript 代码 · 共 48 行

function hasClass(target, classValue)
{
	var pattern = new RegExp("(^| )" + classValue + "( |$)");

	if (target.className.match(pattern))
	{
		return true;
	}

	return false;
};




function addClass(target, classValue)
{
	if (!hasClass(target, classValue))
	{
		if (target.className == "")
		{
			target.className = classValue;
		}
		else
		{
			target.className += " " + classValue;
		}
	}

	return true;
};




function removeClass(target, classValue)
{
	var removedClass = target.className;
	var pattern = new RegExp("(^| )" + classValue + "( |$)");

	removedClass = removedClass.replace(pattern, "$1");
	removedClass = removedClass.replace(/ $/, "");

	target.className = removedClass;

	return true;
};