javascript對Cook的讀寫刪操作

<script>

//寫cookies函數
function SetCookie(name,value)//兩個參數，一個是cookie的名子，一個是值
{
    var Days = 30; //此 cookie 將被儲存 30 天
    var exp  = new Date();    //new Date("December 31, 9998");
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)//取cookies函數        
{
    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
     if(arr != null) return unescape(arr[2]); return null;

}
function delCookie(name)//刪除cookie
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
    if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}

SetCookie ("laohucheng", "100")
document.write(getCookie('laohucheng'));
</script>

以上幾個函數實現了JAVASCRIPT對COOK的讀，寫，刪除操作，非常實用哦