Javascript讀取cookie函數代碼

用法：
一、設定cookie
複製代碼 代碼如下:var cookie = new JSCookie();
// 普通設定
cookie .SetCookie("key1","val1");
// 到期時間為一年
var expire_time = new Date();
expire_time.setFullYear(expire_time.getFullYear() + 1);
cookie .SetCookie("key2","val2",expire_time);
// 設定域及路徑，帶到期時間
cookie .SetCookie("key3","val3",expire_time,".cnblogs.com","/");
// 設定帶子鍵的cookie,子鍵分別是k1,k2,k3
cookie .SetCookie("key4","k1=1&k2=2&k3=3");

二、讀取cookie
複製代碼 代碼如下:// 簡單擷取
cookie .GetCookie("key1");
cookie .GetCookie("key2");
cookie .GetCookie("key3");
cookie .GetCookie("key4");
// 擷取key4的子鍵k1值
cookie .GetChild("key4","k1");

三、刪除 複製代碼 代碼如下:cookie .Expire("key1");
cookie .Expire("key2");
cookie .Expire("key3");
cookie .Expire("key4");

樣本： 複製代碼 代碼如下:<script type="text/javascript">
String.prototype.Trim = function()
{
return this.replace(/^\s+/g,"").replace(/\s+$/g,"");
}
function JSCookie()
{
this.GetCookie = function(key)
{
var cookie = document.cookie;
var cookieArray = cookie.split(';');
var getvalue = "";
for(var i = 0;i<cookieArray.length;i++)
{
if(cookieArray[i].Trim().substr(0,key.length) == key)
{
getvalue = cookieArray[i].Trim().substr(key.length + 1);
break;
}
}
return getvalue;
};
this.GetChild = function(cookiekey,childkey)
{
var child = this.GetCookie(cookiekey);
var childs = child.split('&');
var getvalue = "";
for(var i = 0;i < childs.length;i++)
{
if(childs[i].Trim().substr(0,childkey.length) == childkey)
{
getvalue = childs[i].Trim().substr(childkey.length + 1);
break;
}
}
return getvalue;
};
this.SetCookie = function(key,value,expire,domain,path)
{
var cookie = "";
if(key != null && value != null)
cookie += key + "=" + value + ";";
if(expire != null)
cookie += "expires=" + expire.toGMTString() + ";";
if(domain != null)
cookie += "domain=" + domain + ";";
if(path != null)
cookie += "path=" + path + ";";
document.cookie = cookie;
};
this.Expire = function(key)
{
expire_time = new Date();
expire_time.setFullYear(expire_time.getFullYear() - 1);
var cookie = " " + key + "=e;expires=" + expire_time + ";"
document.cookie = cookie;
}
}
</script>

用正則的方法讀取cookie值
由於asp的cookie是經過url編碼的，所以讀之前要unescape一下。

下面是我用正則的方法取cookie，包括單值和多值： 複製代碼 代碼如下:/**************************************************
參數說明：
sMainName Cookie名
sSubName Cookie子鍵名，留空表示單值Cookie
**************************************************/
function GetCookie(sMainName, sSubName)
{
var re = new RegExp((sSubName ? sMainName + "=(?:.*?&)*?" + sSubName + "=([^&;$]*)" : sMainName + "=([^;$]*)"),"i");
return re.test(unescape(document.cookie)) ? RegExp["$1"] : "";
}