//创建cookie
function addCookie(){var Days = 30;var exp = new Date();exp.setTime(exp.getTime() + Days*24*60*60*1000);document.cookie = "lastUserName" + "="+ escape (un) + ";expires=" + exp.toGMTString();
}
//读取cookie
function getCookie(name) {var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");if(arr=document.cookie.match(reg))return unescape(arr[2]);elsereturn null;
}
//删除cookies
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();}else{document.getElementById("j_username").value="请输入用户名";}
}