Question

我不是程序员。我正在尝试使用cookie脚本来记住最后一个下拉菜单选项。

我找到了一个有效的脚本，但它只有一个会话cookie。如何在此脚本中向cookie添加过期日期？

<head>
  <script>        
    function SETcookie() {
      document.cookie = "Selected=" + document.getElementById('myList').selectedIndex;
    }

    function GETcookie() {
      if (document.cookie) {
        eval(document.cookie);
        document.getElementById('myList').selectedIndex = Selected;
      }
    }    
  </script>
</head>

<body onLoad="GETcookie()">
  <select id="myList" onChange="SETcookie()">
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
    <option value="4">Option 4</option>
  </select>
</body>

Answer 1

试试这个：

function setCookie(c_name,c_value,exdays) {
   var exdate=new Date();
   exdate.setDate(exdate.getDate() + exdays);
   document.cookie=encodeURIComponent(c_name) 
     + "=" + encodeURIComponent(c_value)
     + (!exdays ? "" : "; expires="+exdate.toUTCString());
     ;
}

c_name是Cookie的名称

c_value是Cookie值

exdays是您希望Cookie在

之后过期的天数

来源：http://www.w3schools.com/js/js_cookies.asp

Answer 2

可能会有所帮助

[index, value]
[4,1]
[9,2]

Answer 3

试

var a = new Date();
a = new Date(a.getTime() +1000*60*60*24*365);
document.cookie = 'mycookie=somevalue; expires='+a.toGMTString()+';';

PS。值1000 * 60 * 60 * 24 * 365 = 1年

要获取所选索引，请尝试以下GETcookie：

function GETcookie(){    
if (document.cookie){    
var a = document.cookie;
Selected = a.substring(a.search('Selected=')+9,a.search(';'));
alert("Selected = " + Selected);
document.getElementById('myList').selectedIndex=Selected;
}}

Answer 4

这里的功能100％正常，没有折旧功能。

function setCookie(variable, value, expires_seconds) {
    var d = new Date();
    d = new Date(d.getTime() + 1000 * expires_seconds);
    document.cookie = variable + '=' + value + '; expires=' + d.toGMTString() + ';';
}

Answer 5

你可以试试这个：

function SETcookie(){  
  var validity_days = 7;
  var expires = validity_days * 1000 * 60 * 60 * 24;
  var expires_date = new Date( today.getTime() + (expires) );
  document.cookie="Selected="+document.getElementById('myList').selectedIndex + ";expires=" + expires_date.toGMTString() + ";";
}

Answer 6

This is for setting the expiry date in terms of minutes(5 minutes here)

function setCookie(cname, cvalue, exdays) {     
  var d = new Date();
  d.setTime(d.getTime() + exdays * 60 * 1000);
  var expires = "expires="+d.toUTCString();

}

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) == 0) {
      return c.substring(name.length, c.length);
    }
  }
  return "";
}
function checkCookie() {
  var user = getCookie("username");
  if (user != "") {
     //your code goes here
  } else {
     //your code goes here
    if (user != "" && user != null) {
      setCookie("username", user, 5);
    }
  }
}

Answer 7

This is for setting the expiry date in terms of days(5 days here)

function setCookie(cname, cvalue, exdays) {     
  var d = new Date();
  d.setTime(d.getTime() + exdays * 24 * 60 * 60 * 1000);
  var expires = "expires="+d.toUTCString();

}

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) == 0) {
      return c.substring(name.length, c.length);
    }
  }
  return "";
}
function checkCookie() {
  var user = getCookie("username");
  if (user != "") {
     //your code goes here
  } else {
     //your code goes here
    if (user != "" && user != null) {
      setCookie("username", user, 5);
    }
  }
}

Cookie失效日期

7 个答案: