js 读写cookie实现代码[网站编程]

*/
//读写cookie函数
function getcookie(c_name)
{
if (document.cookie.length > 0)
{
c_start = document.cookie.indexof(c_name + "=")
if (c_start != -1)
{
c_start = c_start + c_name.length + 1;
c_end = document.cookie.indexof(";",c_start);
if (c_end == -1)
{
c_end = document.cookie.length;
}
return unescape(document.cookie.substring(c_start,c_end));
}
}
return null
}

function setcookie(c_name,value,expiredays)
{
var exdate = new date();
exdate.setdate(exdate.getdate() + expiredays);
document.cookie = c_name + "=" +escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.togmtstring()); //使设置的有效时间精确.增添togmtstring()
}
</script>