1
2<script>
3
4 localStorage.setItem('username', 'JohnDoe');
5 localStorage.setItem('theme', 'dark');
6 localStorage.setItem('settings', JSON.stringify({
7 notifications: true,
8 language: 'en'
9 }));
10
11
12 const username = localStorage.getItem('username');
13 console.log(username);
14
15 const settings = JSON.parse(localStorage.getItem('settings'));
16 console.log(settings.notifications);
17
18
19 localStorage.removeItem('theme');
20
21
22 localStorage.clear();
23
24
25 if (localStorage.getItem('username')) {
26 console.log('User is logged in');
27 }
28
29
30 console.log(localStorage.length);
31
32
33 for (let i = 0; i < localStorage.length; i++) {
34 const key = localStorage.key(i);
35 const value = localStorage.getItem(key);
36 console.log(`${key}: ${value}`);
37 }
38</script>
39
40
41<script>
42
43 sessionStorage.setItem('currentPage', '1');
44 sessionStorage.setItem('searchQuery', 'javascript');
45
46
47 const page = sessionStorage.getItem('currentPage');
48
49
50 sessionStorage.removeItem('searchQuery');
51 sessionStorage.clear();
52
53
54 function saveFormProgress() {
55 const formData = {
56 step: 2,
57 email: 'user@example.com',
58 preferences: ['newsletter', 'updates']
59 };
60 sessionStorage.setItem('formProgress', JSON.stringify(formData));
61 }
62
63 function loadFormProgress() {
64 const saved = sessionStorage.getItem('formProgress');
65 return saved ? JSON.parse(saved) : null;
66 }
67</script>
68
69
70<script>
71
72 function setCookie(name, value, days) {
73 const date = new Date();
74 date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
75 const expires = "expires=" + date.toUTCString();
76 document.cookie = `${name}=${value};${expires};path=/`;
77 }
78
79 setCookie('sessionId', 'abc123', 7);
80 setCookie('userRole', 'admin', 30);
81
82
83 function getCookie(name) {
84 const nameEQ = name + "=";
85 const cookies = document.cookie.split(';');
86 for (let cookie of cookies) {
87 cookie = cookie.trim();
88 if (cookie.indexOf(nameEQ) === 0) {
89 return cookie.substring(nameEQ.length);
90 }
91 }
92 return null;
93 }
94
95 const sessionId = getCookie('sessionId');
96 console.log(sessionId);
97
98
99 function deleteCookie(name) {
100 document.cookie = `${name}=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;`;
101 }
102
103 deleteCookie('sessionId');
104
105
106 document.cookie = "token=xyz789; expires=Fri, 31 Dec 2026 23:59:59 UTC; path=/; secure; samesite=strict";
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112
113
114</script>
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157
158<script>
159
160 window.addEventListener('storage', (e) => {
161 console.log('Storage changed:');
162 console.log('Key:', e.key);
163 console.log('Old value:', e.oldValue);
164 console.log('New value:', e.newValue);
165 console.log('URL:', e.url);
166 console.log('Storage area:', e.storageArea);
167 });
168
169
170
171</script>
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