JS设置cookie,删除cookie

时间:2022-03-30 02:18:27

js设置cookie有很多种方法。

第一种:(这个是w3c官网的代码)

<script>
//设置cookie
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays****));
var expires = "expires="+d.toUTCString();
document.cookie = cname + "=" + cvalue + "; " + expires;
}
//获取cookie
function getCookie(cname) {
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=; i<ca.length; i++) {
var c = ca[i];
while (c.charAt()==' ') c = c.substring();
if (c.indexOf(name) != -) return c.substring(name.length, c.length);
}
return "";
}
//清除cookie
function clearCookie(name) {
setCookie(name, "", -);
}
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, );
}
}
}
checkCookie();
</script>

第二种:

<script>
//JS操作cookies方法! //写cookies
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());
  } //读取cookies
function getCookie(name)
{
var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)"); if(arr=document.cookie.match(reg)) return (arr[]);
else
return null;
} //删除cookies
function delCookie(name)
{
var exp = new Date();
exp.setTime(exp.getTime() - );
var cval=getCookie(name);
if(cval!=null)
document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}
//使用示例
setCookie('username','Darren',)
alert(getCookie("username"));
</script>

第三个例子

<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<script language="JavaScript" type="text/javascript"> function addCookie(objName, objValue, objHours){//添加cookie
var str = objName + "=" + escape(objValue);
if (objHours > ) {//为0时不设定过期时间,浏览器关闭时cookie自动消失
var date = new Date();
var ms = objHours * * ;
date.setTime(date.getTime() + ms);
str += "; expires=" + date.toGMTString();
}
document.cookie = str;
alert("添加cookie成功");
} function getCookie(objName){//获取指定名称的cookie的值
var arrStr = document.cookie.split("; ");
for (var i = ; i < arrStr.length; i++) {
var temp = arrStr[i].split("=");
if (temp[] == objName)
return unescape(temp[]);
}
} function delCookie(name){//为了删除指定名称的cookie,可以将其过期时间设定为一个过去的时间
var date = new Date();
date.setTime(date.getTime() - );
document.cookie = name + "=a; expires=" + date.toGMTString();
} function allCookie(){//读取所有保存的cookie字符串
var str = document.cookie;
if (str == "") {
str = "没有保存任何cookie";
}
alert(str);
} function $(m, n){
return document.forms[m].elements[n].value;
} function add_(){
var cookie_name = $("myform", "cookie_name");
var cookie_value = $("myform", "cookie_value");
var cookie_expireHours = $("myform", "cookie_expiresHours");
addCookie(cookie_name, cookie_value, cookie_expireHours);
} function get_(){
var cookie_name = $("myform", "cookie_name");
var cookie_value = getCookie(cookie_name);
alert(cookie_value);
} function del_(){
var cookie_name = $("myform", "cookie_name");
delCookie(cookie_name);
alert("删除成功");
}
</script>
</head>
<body>
<form name="myform">
<div>
<label for="cookie_name">
名称
</label>
<input type="text" name="cookie_name" />
</div>
<div>
<label for="cookie_value">

</lable>
<input type="text" name="cookie_value" />
</div>
<div>
<label for="cookie_expireHours">
多少个小时过期
</lable>
<input type="text" name="cookie_expiresHours" />
</div>
<div>
<input type="button" value="添加该cookie" onclick="add_()"/><input type="button" value="读取所有cookie" onclick="allCookie()"/><input type="button" value="读取该名称cookie" onclick="get_()"/><input type="button" value="删除该名称cookie" onclick="del_()"/>
</div>
</form>
</body>
</html>

注意:

chrome浏览器在本地获取不到cookie。必须在服务器上才可以。如果是本地的话,你可以放到local的www目录下面。

Google Chrome只支持在线网站的cookie的读写操作,对本地html的cookie操作是禁止的。所以下面的代码如果你写在一个本地的html文件中,将弹出的对话框内容为空。

document.cookie = "Test=cooo";
alert(document.cookie);

如果这个页面是在线网站的内容,则会正常显示cookie内容Test=cooo等等。