<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>记住密码</title>
</head>
<body>
<form id="loginForm">
<input id="user" type="text" placeholder="用户名"><br>
<input id="pswd" type="password" placeholder="密码"><br>
<label><input id="remember" type="checkbox">记住密码</label><br>
<input type='submit' value="登录">
</form>
<script>
window.onload = function(){
var oForm = document.getElementById('loginForm');
var oUser = document.getElementById('user');
var oPswd = document.getElementById('pswd');
var oRemember = document.getElementById('remember');
//页面初始化时，如果帐号密码cookie存在则填充
if(getCookie('user') && getCookie('pswd')){
oUser.value = getCookie('user');
oPswd.value = getCookie('pswd');
oRemember.checked = true;
}
//复选框勾选状态发生改变时，如果未勾选则清除cookie
oRemember.onchange = function(){
if(!this.checked){
delCookie('user');
delCookie('pswd');
}
};
//表单提交事件触发时，如果复选框是勾选状态则保存cookie
oForm.onsubmit = function(){
if(remember.checked){
setCookie('user',oUser.value,7); //保存帐号到cookie，有效期7天
setCookie('pswd',oPswd.value,7); //保存密码到cookie，有效期7天
}
};
};
//设置cookie
function setCookie(name,value,day){
var date = new Date();
date.setDate(date.getDate() + day);
document.cookie = name + '=' + value + ';expires='+ date;
};
//获取cookie
function getCookie(name){
var reg = RegExp(name+'=([^;]+)');
var arr = document.cookie.match(reg);
if(arr){
return arr[1];
}else{
return '';
}
};
//删除cookie
function delCookie(name){
setCookie(name,null,-1);
};
</script>
</body>
</html>
