cookie很实用的一个功能，可以判断某个状态，在项目中使用率极高

复制代码 代码如下:

function setCookie(name,value)

{

var Days = 30;

var exp = new Date();

exp.setTime(exp.getTime() + Days*24*60*60*1000);

document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();

var strsec = getsec(time);

var exp = new Date();

exp.setTime(exp.getTime() + strsec*1);

document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();

}

//读取cookies

function getCookie(name)

{

var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");

if(arr=document.cookie.match(reg))

return (unescape(arr[2]));

else

return null;

}

//删除cookies

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();

}