JavaScript操作cookie

<html>
<head>
<script type="text/javascript">
/*
var browser=navigator.appName
var b_version=navigator.appVersion
var version=parseFloat(b_version)

document.write("Browser name: "+ browser)
document.write("<br />")
document.write("Browser version: "+ version)
*/
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());
}
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 "";
}
function checkCookie() {
 username = getCookie("username");
 if (username != null && username != "") {
  alert("Welcome again " + username + "!");
 } else {
  username = prompt("Please enter your name:", "");
  if (username != null && username != "") {
   setCookie("username", username, 365);
  }
 }
}
//setCookie();
//alert(getCookie('username'));
var t=setTimeout("alert('555')",5000)
document.write(t);
</script>
</head>

<body>
</body>

</html>

 

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