cookie删除js（cookie删除后IP上还有痕迹吗）

更新：2022-11-16 18:31

本文目录一览：

1. 如何用js删除php生成的cookie
2. js如何删除cookie
3. 在js中如何删除一个cookie
4. js删除cookie
5. JS 中怎么删除cookie
6. 如何使用js删除cookies？

---

如何用js删除php生成的cookie

var cookiecheck = '<?= $_COOKIE['cookiename'] ?>';

该PHP语句的作用在于获得cookie名为cookiename的cookie值，假设为[cookiename]，然后输出该值。 由于在PHP是服务器解析，所以它会在JS被执行之前生成，最后你的静态页面上显示出来的就是：

var cookiecheck = [cookiename];

测试代码如下：

<?php
SetCookie("name", "this is my cookie");
?>

<script type="text/javascript">
function getCookie(name) {
    var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
    if (arr != null) return unescape(arr[2]);
    return null;
}
// 判断是否已经登录
if (!getCookie("name")) {
    alert('失败');
} else {
    alert(getCookie("name"));
}
</script>

---

js如何删除cookie

设置cookie的时间为过期时间即可：

function delCookie(name) { // 为cookie name
    var date = new Date();
    date.setTime(date.getTime() - 10000);
    document.cookie = name + "=a; expires=" + date.toGMTString();
}

---

在js中如何删除一个cookie

1、简单的删除cookie

// 删除cookie
function deleteCookie(name) {
    var date = new Date();
    date.setTime(date.getTime() - 10000);
    document.cookie = name + "=v; expires=" + date.toGMTString();
}

2、设置访问路径的cookie删除

/**
 * js 删除 http cookie
 * @param name  名字
 * @param path  路径
 * @param domain 域名
 */
function deleteCookie(name, path, domain) {
    if (getCookie(name)) document.cookie = name + '=' +
        ((path) ? '; path=' + path : '') +
        ((domain) ? '; domain=' + domain : '') +
        '; expires=Thu, 01-Jan-1970 00:00:01 GMT';
}
/**
 * js取得http cookie
 * @param name cookie名字
 */
function getCookie(name) {
    var start = document.cookie.indexOf(name + "=");
    var len = start + name.length + 1;
    if ((!start) && (name != document.cookie.substring(0, name.length))) {
        return null;
    }
    if (start == -1) return null;
    var end = document.cookie.indexOf(";", len);
    if (end == -1) end = document.cookie.length;
    return unescape(document.cookie.substring(len, end));
}

---

js删除cookie

读取Cookie的函数

function readCookie(name) {
    var cookieValue = "";
    var search = name + "=";
    if (document.cookie.length > 0) {
        offset = document.cookie.indexOf(search);
        if (offset != -1) {
            offset += search.length;
            end = document.cookie.indexOf(";", offset);
            if (end == -1) end = document.cookie.length;
            cookieValue = unescape(document.cookie.substring(offset, end));
        }
    }
    return cookieValue;
}

写入Cookie的函数

function writeCookie(name, value, hours) {
    var expire = "";
    if (hours != null) {
        expire = new Date((new Date()).getTime() + hours * 3600000);
        expire = "; expires=" + expire.toGMTString();
    }
    document.cookie = name + "=" + escape(value) + expire;
}

writeCookie("PHPSESSID", new Date().getTime(), -1);
console.log(readCookie("PHPSESSID"));

---

JS 中怎么删除cookie

document.cookie = "xxx=yyy";
// cookie 的删除
// 就是把一个键值对设置成过去的时间
document.cookie = "xxx=zzz; expires=" + date1; // date表示日期，表示cookie多久之后自动消失

---

如何使用js删除cookies？

<script language="JavaScript" type="text/javascript">
function addCookie(objName, objValue, objHours) { // 添加cookie
    var str = objName + "=" + escape(objValue);
    if (objHours > 0) { // 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 * 3600 * 1000;
        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 = 0; i < arrStr.length; i++) {
        var temp = arrStr[i].split("=");
        if (temp[0] == objName) return unescape(temp[1]);
    }
}
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() - 10000);
    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>