box==“checkBox ‘是否记住用户密码’”；
window.onload=function init()
{
var box = getCookie("box_"+str);
var username = getCookie("usn_"+str);
var password = getCookie("pwd_"+str);
if(box=='yes')
{
form1.box.checked=true;
form1.loginName.value=username;
form1.password.value=password;
}
if(form1.box.checked)
{
SetCookie("usn_"+str,form1.loginName.value);
SetCookie("pwd_"+str,form1.password.value);
SetCookie("box_"+str,"yes");
}else{
delCookie("box_"+str);
}
function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
{
var Days = 300; //此 cookie 将被保存 30 天
var exp = new Date(); //new Date("December 31, 9998");
exp.setTime(exp.getTime() + Days*24*60*60*1000);
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)//取cookies函数
{
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr != null) return (arr[2]); return null;
}
function delCookie(name)//删除cookie
{
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();