添加cookie，获取cookie，删除cookie

全部编写在一个js文件中，使用时直接调用某个function即可

function addCookie(objName,objValue,objHours){      //添加cookie

    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()+";path=/";	//此处"path=/"是为了使其他路径的页面也能找到cookie

    }

    document.cookie = str;

}

function getCookie(objName){//获取指定名称的cookie的值

    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]);

    }

}
function deleteCookie(objName){
    // addCookie(objName,1,-1);
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(objName);
    if(cval!=null){
        document.cookie= objName + "="+cval+";expires="+exp.toGMTString()+";path=/";
    }

}