JS cookie操作函数，Cookie增加，读取，删除。

<title>JS cookie操作函数</title>
<script>
//获得coolie 的值
function cookie(name) {
	 //得到分割的cookie名值对
	var cookieArray = document.cookie.split("; ");
	var cookie = new Object();
	for (var i = 0; i < cookieArray.length; i++) {
		 //将名和值分开
		var arr = cookieArray[i].split("=");
		 //如果是指定的cookie，则返回它的值
		if (arr[0] == name) return unescape(arr[1]);
	}
	return "";
}
 //删除cookie
function delCookie(name){
	document.cookie = name + "=;expires=" + (new Date(0)).toGMTString();
}
 //获取指定名称的cookie的值
function getCookie(objName) {
	var arrStr = document.cookie.split("; ");
	for (var i = 0; i < arrStr.length; i++) {
		var temp = arrStr[i].split("=");
		if (temp[0] == objName) return unescape(temp[1]);
	}
}
 //添加cookie
function addCookie(objName, objValue, objHours) {
	var str = objName + "=" + escape(objValue);
	 //为时不设定过期时间，浏览器关闭时cookie自动消失
	if (objHours > 0) {
		var date = new Date();
		var ms = objHours * 3600 * 1000;
		date.setTime(date.getTime() + ms);
		str += "; expires=" + date.toGMTString();
	}
	document.cookie = str;
}
 //两个参数，一个是cookie的名子，一个是值
function SetCookie(name, value){
	 //此 cookie 将被保存 30 天
	var Days = 30;
	 //new Date("December 31, 9998");
	var exp = new Date();
	exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
	document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();

}
 //取cookies函数   
function getCookie(name){
	var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
	if (arr != null) return unescape(arr[2]);
	return null;
}
//删除cookie
function delCookie(name) {
	var exp = new Date();
	exp.setTime(exp.getTime() - 1);
	var cval = getCookie(name);
	if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
}
</script>