来自 JavaScript 高级程序设计(第四版)
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Documenttitle>
<style>
body {
height: 3000px;
position: relative;
}
#status {
width: 100px;
height: 100px;
background-color: #ff0;
}
style>
head>
<body>
<script>
class CookieUtil {
// 根据name获取cookie
static get(name) {
let cookieName = `${encodeURIComponent(name)}=`,
cookieStart = document.cookie.indexOf(cookieName),
cookieValue = null;
if (cookieStart > -1) {
let cookieEnd = document.cookie.indexOf(";", cookieStart);
if (cookieEnd == -1) {
cookieEnd = document.cookie.length;
}
cookieValue = decodeURIComponent(
document.cookie.substring(
cookieStart + cookieName.length,
cookieEnd
)
);
}
return cookieValue;
}
// 设置cookie
static set(name, value, expires, path, domain, secure) {
let cookieText = `${encodeURIComponent(name)}=${encodeURIComponent(
value
)}`;
if (expires instanceof Date) {
cookieText += `; expires=${expires.toGMTString()}`;
}
if (path) {
cookieText += `; path=${path}`;
}
if (domain) {
cookieText += `; domain=${domain}`;
}
if (secure) {
cookieText += `; secure`;
}
document.cookie = cookieText;
}
// 删除cookie,就是将过期时间设置为new Date(0)
static unset(name, path, domain, secure) {
CookieUtil.set(name, "", new Date(0), path, domain, secure);
}
}
// 设置cookie
CookieUtil.set("name", "nicholas");
CookieUtil.set("book", "professional Javascript");
// 读取cookie
console.log(CookieUtil.get("name"));
console.log(CookieUtil.get("book"));
// 删除cookie
CookieUtil.unset("name");
CookieUtil.unset("book");
// 设置有路径,域和过期时间的cookie
CookieUtil.set("name", "dragon", new Date("2022-5-20"), "", "127.0.0.1");
// 删除刚刚设置的cookie
CookieUtil.unset("name");
// 设置安全cookie
CookieUtil.set("name", "dragon", null, null, null, true);
script>
<script src="./test.js">script>
body>
html>
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