js简单操作Cookie

　　贴一段js简单操作Cookie的代码：

//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);
    if (objHours > 0) {                               //为时不设定过期时间，浏览器关闭时cookie自动消失
        var date = new Date();
        var ms = objHours * 3600 * 1000;
        date.setTime(date.getTime() + ms);
        str += "; expires=" + date.toGMTString();
    }
    document.cookie = str;
}
//删除cookie
function delCookie(name)
{
    document.cookie = name + "=;expires=" + (new Date(0)).toGMTString();
}