编程狮在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<head>
<script>
function setCookie(cname,cvalue,exdays){
  var d = new Date();
  d.setTime(d.getTime()+(exdays*24*60*60*1000));
  var expires = "expires="+d.toGMTString();
  document.cookie = cname+"="+cvalue+"; "+expires;
}
function getCookie(cname){
  var name = cname + "=";
  var ca = document.cookie.split(';');
  for(var i=0; i<ca.length; i++) {
    var c = ca[i].trim();
    if (c.indexOf(name)==0) return c.substring(name.length,c.length);
  }
  return "";
}
function checkCookie(){
  var user=getCookie("username");
  if (user!=""){
    alert("Welcome again " + user);
  }
  else {
    user = prompt("Please enter your name:","");
      if (user!="" && user!=null){
        setCookie("username",user,30);
      }
  }
}
</script>
</head>
  
<body onload="checkCookie()"></body>
  
</html>
实例代码
运行结果