javascript设置cookie

//写cookies

function setCookie(name,value)

{

var Days = 1;

var exp = new Date();

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

document.cookie = name + "="+ null;

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

}

//读取cookies

function getCookie(name)

{

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

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

return (arr[2]);

else

return null;

}