JavaScript中如何使用cookie实现记住密码功能及cookie相关函数介绍

HttpServletRequest request 
HttpServletResponse response
Cookie username = new Cookie("username ","cookievalue");
Cookie password = new Cookie("password ","cookievalue");
response.addCookie(username );
response.addCookie(password );

//设置cookie
var passKey = '4c05c54d952b11e691d76c0b843ea7f9';
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+d.toUTCString();
document.cookie = cname + "=" + encrypt(escape(cvalue), passKey) + "; " + expires;
}
//获取cookie
function getCookie(cname) {
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1);
if (c.indexOf(name) != -1){
var cnameValue = unescape(c.substring(name.length, c.length));
return decrypt(cnameValue, passKey);
} 
}
return "";
}
//清除cookie 
function clearCookie(cname) { 
setCookie(cname, "", -1); 
}

<input type="checkbox" id="rememberMe" checked="checked"/>记住密码

if($('#rememberMe').is(':checked')){
setCookie('customername', $('#username').val().trim(), 7)
setCookie('customerpass', $('#password').val().trim(), 7)
}

$(function(){
//获取cookie
var cusername = getCookie('customername');
var cpassword = getCookie('customerpass');
if(cusername != "" && cpassword != ""){
$("#username").val(cusername);
$("#password").val(cpassword);
}
}

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//设置cookie函数，三个参数，一个是cookie的名子，一个是值，一个是设置cookie保存时间，单位：天
function SetCookie(name,value,days){
 var days=arguments[2]"December 31, 9998");
 exp.setTime(exp.getTime() + days*86400000);
 document.cookie=name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
//取cookies函数
function getCookie(name){
 var arr=document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
 if(arr!=null){
 return unescape(arr[2]);
 }
 return null;
}
//删除cookie函数
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();
 }
}