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name",[1578,1805,1737],{"class":1679},[1578,1807,1808],{"class":1696},"return",[1578,1810,1749],{"class":1591},[1578,1812,1756],{"class":1679},[1578,1814,1815],{"class":1711},"1",[1578,1817,1762],{"class":1679},[1578,1819,1614],{"class":1594},[1578,1821,1823],{"class":1580,"line":1822},10,[1578,1824,1825],{"class":1594},"    }\n",[1578,1827,1829,1832],{"class":1580,"line":1828},11,[1578,1830,1831],{"class":1696},"    return",[1578,1833,1834],{"class":1594}," null;\n",[1578,1836,1838],{"class":1580,"line":1837},12,[1578,1839,1840],{"class":1594},"}\n",[1578,1842,1844],{"class":1580,"line":1843},13,[1578,1845,1621],{"emptyLinePlaceholder":1620},[1578,1847,1849,1852,1854,1857,1859,1862,1864,1866,1869,1871,1874,1876],{"class":1580,"line":1848},14,[1578,1850,1851],{"class":1591},"console",[1578,1853,1595],{"class":1594},[1578,1855,1856],{"class":1637},"log",[1578,1858,1641],{"class":1591},[1578,1860,1861],{"class":1637},"getCookie",[1578,1863,1641],{"class":1591},[1578,1865,1611],{"class":1594},[1578,1867,1868],{"class":1607},"username",[1578,1870,1611],{"class":1594},[1578,1872,1873],{"class":1591},"))",[1578,1875,1715],{"class":1594},[1578,1877,1878],{"class":1584}," // 输出 alice\n",[1880,1881,1882],"tip",{},[1530,1883,1884],{},"因为 Cookie 会被每次请求带上，过多的 Cookie 会导致请求变大，影响性能。",[1534,1886],{},[1525,1888,1890],{"id":1889},"localstorage持久化的大容量存储","🗄 localStorage：持久化的大容量存储",[1530,1892,1893],{},"localStorage 是 HTML5 引入的本地存储机制，存储容量通常在 5MB 左右，远大于 Cookie。它的数据会一直保存在浏览器，即使关闭标签页或者浏览器也不会消失。",[1530,1895,1896],{},"特点总结：",[1547,1898,1899,1902,1905,1908],{},[1550,1900,1901],{},"持久存储，除非主动清除，否则数据一直存在。",[1550,1903,1904],{},"只能存储字符串，存对象时需要用 JSON.stringify 和 JSON.parse。",[1550,1906,1907],{},"只在同源策略下可用（协议、域名、端口都要相同）。",[1550,1909,1910],{},"不会自动随请求发送给服务器。",[1563,1912,1914],{"id":1913},"示例localstorage-读写","示例：localStorage 读写",[1568,1916,1918],{"className":1570,"code":1917,"language":1572,"meta":1573,"style":1573},"// 存储数据\nlocalStorage.setItem('theme', 'dark');\n\n// 读取数据\nvar theme = localStorage.getItem('theme');\nconsole.log(theme); // 输出 dark\n\n// 删除数据\nlocalStorage.removeItem('theme');\n\n// 清空所有\nlocalStorage.clear();\n",[1575,1919,1920,1925,1958,1962,1967,1996,2012,2016,2021,2042,2046,2051],{"__ignoreMap":1573},[1578,1921,1922],{"class":1580,"line":1581},[1578,1923,1924],{"class":1584},"// 存储数据\n",[1578,1926,1927,1930,1932,1935,1937,1939,1942,1944,1947,1949,1952,1954,1956],{"class":1580,"line":1588},[1578,1928,1929],{"class":1591},"localStorage",[1578,1931,1595],{"class":1594},[1578,1933,1934],{"class":1637},"setItem",[1578,1936,1641],{"class":1591},[1578,1938,1611],{"class":1594},[1578,1940,1941],{"class":1607},"theme",[1578,1943,1611],{"class":1594},[1578,1945,1946],{"class":1594},",",[1578,1948,1604],{"class":1594},[1578,1950,1951],{"class":1607},"dark",[1578,1953,1611],{"class":1594},[1578,1955,1648],{"class":1591},[1578,1957,1614],{"class":1594},[1578,1959,1960],{"class":1580,"line":1617},[1578,1961,1621],{"emptyLinePlaceholder":1620},[1578,1963,1964],{"class":1580,"line":1624},[1578,1965,1966],{"class":1584},"// 读取数据\n",[1578,1968,1969,1971,1974,1976,1979,1981,1984,1986,1988,1990,1992,1994],{"class":1580,"line":1630},[1578,1970,1703],{"class":1633},[1578,1972,1973],{"class":1591}," theme ",[1578,1975,1601],{"class":1594},[1578,1977,1978],{"class":1591}," localStorage",[1578,1980,1595],{"class":1594},[1578,1982,1983],{"class":1637},"getItem",[1578,1985,1641],{"class":1591},[1578,1987,1611],{"class":1594},[1578,1989,1941],{"class":1607},[1578,1991,1611],{"class":1594},[1578,1993,1648],{"class":1591},[1578,1995,1614],{"class":1594},[1578,1997,1998,2000,2002,2004,2007,2009],{"class":1580,"line":1654},[1578,1999,1851],{"class":1591},[1578,2001,1595],{"class":1594},[1578,2003,1856],{"class":1637},[1578,2005,2006],{"class":1591},"(theme)",[1578,2008,1715],{"class":1594},[1578,2010,2011],{"class":1584}," // 输出 dark\n",[1578,2013,2014],{"class":1580,"line":1693},[1578,2015,1621],{"emptyLinePlaceholder":1620},[1578,2017,2018],{"class":1580,"line":1743},[1578,2019,2020],{"class":1584},"// 删除数据\n",[1578,2022,2023,2025,2027,2030,2032,2034,2036,2038,2040],{"class":1580,"line":1781},[1578,2024,1929],{"class":1591},[1578,2026,1595],{"class":1594},[1578,2028,2029],{"class":1637},"removeItem",[1578,2031,1641],{"class":1591},[1578,2033,1611],{"class":1594},[1578,2035,1941],{"class":1607},[1578,2037,1611],{"class":1594},[1578,2039,1648],{"class":1591},[1578,2041,1614],{"class":1594},[1578,2043,2044],{"class":1580,"line":1822},[1578,2045,1621],{"emptyLinePlaceholder":1620},[1578,2047,2048],{"class":1580,"line":1828},[1578,2049,2050],{"class":1584},"// 清空所有\n",[1578,2052,2053,2055,2057,2060,2063],{"class":1580,"line":1837},[1578,2054,1929],{"class":1591},[1578,2056,1595],{"class":1594},[1578,2058,2059],{"class":1637},"clear",[1578,2061,2062],{"class":1591},"()",[1578,2064,1614],{"class":1594},[1880,2066,2067],{},[1530,2068,2069],{},"localStorage 适合存储用户偏好、界面设置、缓存等非敏感数据。",[1534,2071],{},[1525,2073,2075],{"id":2074},"sessionstorage会话级别的存储","🕒 sessionStorage：会话级别的存储",[1530,2077,2078],{},"sessionStorage 和 localStorage 类似，但它的生命周期只限于当前浏览器标签页（窗口）。关闭标签页，数据就清空。",[1530,2080,2081],{},"特点：",[1547,2083,2084,2087,2090,2093],{},[1550,2085,2086],{},"只在当前会话有效，关闭页面即失效。",[1550,2088,2089],{},"存储容量和 localStorage 一样，通常约 5MB。",[1550,2091,2092],{},"依然只能存储字符串。",[1550,2094,2095],{},"跨标签页无法共享数据。",[1563,2097,2099],{"id":2098},"示例sessionstorage-读写","示例：sessionStorage 读写",[1568,2101,2103],{"className":1570,"code":2102,"language":1572,"meta":1573,"style":1573},"// 存数据\nsessionStorage.setItem('cart', JSON.stringify(['apple', 'banana']));\n\n// 取数据\nvar cart = JSON.parse(sessionStorage.getItem('cart') || '[]');\nconsole.log(cart); // 输出 [\"apple\", \"banana\"]\n\n// 删除或清空同 localStorage\nsessionStorage.removeItem('cart');\nsessionStorage.clear();\n",[1575,2104,2105,2110,2162,2166,2171,2218,2234,2238,2243,2263],{"__ignoreMap":1573},[1578,2106,2107],{"class":1580,"line":1581},[1578,2108,2109],{"class":1584},"// 存数据\n",[1578,2111,2112,2115,2117,2119,2121,2123,2126,2128,2130,2133,2135,2138,2141,2143,2146,2148,2150,2152,2155,2157,2160],{"class":1580,"line":1588},[1578,2113,2114],{"class":1591},"sessionStorage",[1578,2116,1595],{"class":1594},[1578,2118,1934],{"class":1637},[1578,2120,1641],{"class":1591},[1578,2122,1611],{"class":1594},[1578,2124,2125],{"class":1607},"cart",[1578,2127,1611],{"class":1594},[1578,2129,1946],{"class":1594},[1578,2131,2132],{"class":1591}," JSON",[1578,2134,1595],{"class":1594},[1578,2136,2137],{"class":1637},"stringify",[1578,2139,2140],{"class":1591},"([",[1578,2142,1611],{"class":1594},[1578,2144,2145],{"class":1607},"apple",[1578,2147,1611],{"class":1594},[1578,2149,1946],{"class":1594},[1578,2151,1604],{"class":1594},[1578,2153,2154],{"class":1607},"banana",[1578,2156,1611],{"class":1594},[1578,2158,2159],{"class":1591},"]))",[1578,2161,1614],{"class":1594},[1578,2163,2164],{"class":1580,"line":1617},[1578,2165,1621],{"emptyLinePlaceholder":1620},[1578,2167,2168],{"class":1580,"line":1624},[1578,2169,2170],{"class":1584},"// 取数据\n",[1578,2172,2173,2175,2178,2180,2182,2184,2187,2190,2192,2194,2196,2198,2200,2202,2204,2207,2209,2212,2214,2216],{"class":1580,"line":1630},[1578,2174,1703],{"class":1633},[1578,2176,2177],{"class":1591}," cart ",[1578,2179,1601],{"class":1594},[1578,2181,2132],{"class":1591},[1578,2183,1595],{"class":1594},[1578,2185,2186],{"class":1637},"parse",[1578,2188,2189],{"class":1591},"(sessionStorage",[1578,2191,1595],{"class":1594},[1578,2193,1983],{"class":1637},[1578,2195,1641],{"class":1591},[1578,2197,1611],{"class":1594},[1578,2199,2125],{"class":1607},[1578,2201,1611],{"class":1594},[1578,2203,1737],{"class":1591},[1578,2205,2206],{"class":1594},"||",[1578,2208,1604],{"class":1594},[1578,2210,2211],{"class":1607},"[]",[1578,2213,1611],{"class":1594},[1578,2215,1648],{"class":1591},[1578,2217,1614],{"class":1594},[1578,2219,2220,2222,2224,2226,2229,2231],{"class":1580,"line":1654},[1578,2221,1851],{"class":1591},[1578,2223,1595],{"class":1594},[1578,2225,1856],{"class":1637},[1578,2227,2228],{"class":1591},"(cart)",[1578,2230,1715],{"class":1594},[1578,2232,2233],{"class":1584}," // 输出 [\"apple\", \"banana\"]\n",[1578,2235,2236],{"class":1580,"line":1693},[1578,2237,1621],{"emptyLinePlaceholder":1620},[1578,2239,2240],{"class":1580,"line":1743},[1578,2241,2242],{"class":1584},"// 删除或清空同 localStorage\n",[1578,2244,2245,2247,2249,2251,2253,2255,2257,2259,2261],{"class":1580,"line":1781},[1578,2246,2114],{"class":1591},[1578,2248,1595],{"class":1594},[1578,2250,2029],{"class":1637},[1578,2252,1641],{"class":1591},[1578,2254,1611],{"class":1594},[1578,2256,2125],{"class":1607},[1578,2258,1611],{"class":1594},[1578,2260,1648],{"class":1591},[1578,2262,1614],{"class":1594},[1578,2264,2265,2267,2269,2271,2273],{"class":1580,"line":1822},[1578,2266,2114],{"class":1591},[1578,2268,1595],{"class":1594},[1578,2270,2059],{"class":1637},[1578,2272,2062],{"class":1591},[1578,2274,1614],{"class":1594},[1880,2276,2277],{},[1530,2278,2279],{},"sessionStorage 非常适合存储临时数据，比如临时表单输入、单次会话缓存。",[1534,2281],{},[1525,2283,2285],{"id":2284},"indexeddb浏览器内的数据库","🗃 IndexedDB：浏览器内的数据库",[1530,2287,2288],{},"前面介绍的三种存储都比较简单，存储容量有限且只能存字符串。IndexedDB 是浏览器提供的一个功能强大的异步数据库，支持存储结构化数据，甚至二进制文件，容量远大于 localStorage。",[1530,2290,2081],{},[1547,2292,2293,2296,2299,2302],{},[1550,2294,2295],{},"支持事务和索引，类似关系数据库。",[1550,2297,2298],{},"异步 API，操作复杂，需要一定学习成本。",[1550,2300,2301],{},"数据存储容量大，适合海量数据存储。",[1550,2303,2304],{},"支持对象存储，无需转换为字符串。",[1563,2306,2307],{"id":2307},"基本使用示例",[1568,2309,2311],{"className":1570,"code":2310,"language":1572,"meta":1573,"style":1573},"var request = indexedDB.open('myDB', 1);\n\nrequest.onupgradeneeded = function (event) {\n    var db = event.target.result;\n    var objectStore = db.createObjectStore('users', { keyPath: 'id' });\n};\n\nrequest.onsuccess = function (event) {\n    var db = event.target.result;\n    var transaction = db.transaction(['users'], 'readwrite');\n    var store = transaction.objectStore('users');\n\n    store.add({ id: 1, name: 'Alice', age: 25 });\n\n    store.get(1).onsuccess = function (event) {\n        console.log(event.target.result); // 输出用户对象\n    };\n};\n\nrequest.onerror = function (event) {\n    console.error('数据库打开失败', event);\n};\n",[1575,2312,2313,2348,2352,2376,2400,2450,2455,2459,2480,2500,2539,2567,2571,2622,2626,2658,2687,2693,2698,2703,2725,2753],{"__ignoreMap":1573},[1578,2314,2315,2317,2320,2322,2325,2327,2330,2332,2334,2337,2339,2341,2344,2346],{"class":1580,"line":1581},[1578,2316,1703],{"class":1633},[1578,2318,2319],{"class":1591}," request ",[1578,2321,1601],{"class":1594},[1578,2323,2324],{"class":1591}," indexedDB",[1578,2326,1595],{"class":1594},[1578,2328,2329],{"class":1637},"open",[1578,2331,1641],{"class":1591},[1578,2333,1611],{"class":1594},[1578,2335,2336],{"class":1607},"myDB",[1578,2338,1611],{"class":1594},[1578,2340,1946],{"class":1594},[1578,2342,2343],{"class":1711}," 1",[1578,2345,1648],{"class":1591},[1578,2347,1614],{"class":1594},[1578,2349,2350],{"class":1580,"line":1588},[1578,2351,1621],{"emptyLinePlaceholder":1620},[1578,2353,2354,2357,2359,2362,2364,2367,2369,2372,2374],{"class":1580,"line":1617},[1578,2355,2356],{"class":1591},"request",[1578,2358,1595],{"class":1594},[1578,2360,2361],{"class":1637},"onupgradeneeded",[1578,2363,1663],{"class":1594},[1578,2365,2366],{"class":1633}," function",[1578,2368,1700],{"class":1594},[1578,2370,2371],{"class":1644},"event",[1578,2373,1648],{"class":1594},[1578,2375,1651],{"class":1594},[1578,2377,2378,2380,2383,2385,2388,2390,2393,2395,2398],{"class":1580,"line":1624},[1578,2379,1657],{"class":1633},[1578,2381,2382],{"class":1591}," db",[1578,2384,1663],{"class":1594},[1578,2386,2387],{"class":1591}," event",[1578,2389,1595],{"class":1594},[1578,2391,2392],{"class":1591},"target",[1578,2394,1595],{"class":1594},[1578,2396,2397],{"class":1591},"result",[1578,2399,1614],{"class":1594},[1578,2401,2402,2404,2407,2409,2411,2413,2416,2418,2420,2423,2425,2427,2430,2433,2436,2438,2441,2443,2446,2448],{"class":1580,"line":1630},[1578,2403,1657],{"class":1633},[1578,2405,2406],{"class":1591}," objectStore",[1578,2408,1663],{"class":1594},[1578,2410,2382],{"class":1591},[1578,2412,1595],{"class":1594},[1578,2414,2415],{"class":1637},"createObjectStore",[1578,2417,1641],{"class":1679},[1578,2419,1611],{"class":1594},[1578,2421,2422],{"class":1607},"users",[1578,2424,1611],{"class":1594},[1578,2426,1946],{"class":1594},[1578,2428,2429],{"class":1594}," {",[1578,2431,2432],{"class":1679}," keyPath",[1578,2434,2435],{"class":1594},":",[1578,2437,1604],{"class":1594},[1578,2439,2440],{"class":1607},"id",[1578,2442,1611],{"class":1594},[1578,2444,2445],{"class":1594}," }",[1578,2447,1648],{"class":1679},[1578,2449,1614],{"class":1594},[1578,2451,2452],{"class":1580,"line":1654},[1578,2453,2454],{"class":1594},"};\n",[1578,2456,2457],{"class":1580,"line":1693},[1578,2458,1621],{"emptyLinePlaceholder":1620},[1578,2460,2461,2463,2465,2468,2470,2472,2474,2476,2478],{"class":1580,"line":1743},[1578,2462,2356],{"class":1591},[1578,2464,1595],{"class":1594},[1578,2466,2467],{"class":1637},"onsuccess",[1578,2469,1663],{"class":1594},[1578,2471,2366],{"class":1633},[1578,2473,1700],{"class":1594},[1578,2475,2371],{"class":1644},[1578,2477,1648],{"class":1594},[1578,2479,1651],{"class":1594},[1578,2481,2482,2484,2486,2488,2490,2492,2494,2496,2498],{"class":1580,"line":1781},[1578,2483,1657],{"class":1633},[1578,2485,2382],{"class":1591},[1578,2487,1663],{"class":1594},[1578,2489,2387],{"class":1591},[1578,2491,1595],{"class":1594},[1578,2493,2392],{"class":1591},[1578,2495,1595],{"class":1594},[1578,2497,2397],{"class":1591},[1578,2499,1614],{"class":1594},[1578,2501,2502,2504,2507,2509,2511,2513,2516,2518,2520,2522,2524,2526,2528,2530,2533,2535,2537],{"class":1580,"line":1822},[1578,2503,1657],{"class":1633},[1578,2505,2506],{"class":1591}," transaction",[1578,2508,1663],{"class":1594},[1578,2510,2382],{"class":1591},[1578,2512,1595],{"class":1594},[1578,2514,2515],{"class":1637},"transaction",[1578,2517,2140],{"class":1679},[1578,2519,1611],{"class":1594},[1578,2521,2422],{"class":1607},[1578,2523,1611],{"class":1594},[1578,2525,1762],{"class":1679},[1578,2527,1946],{"class":1594},[1578,2529,1604],{"class":1594},[1578,2531,2532],{"class":1607},"readwrite",[1578,2534,1611],{"class":1594},[1578,2536,1648],{"class":1679},[1578,2538,1614],{"class":1594},[1578,2540,2541,2543,2546,2548,2550,2552,2555,2557,2559,2561,2563,2565],{"class":1580,"line":1828},[1578,2542,1657],{"class":1633},[1578,2544,2545],{"class":1591}," store",[1578,2547,1663],{"class":1594},[1578,2549,2506],{"class":1591},[1578,2551,1595],{"class":1594},[1578,2553,2554],{"class":1637},"objectStore",[1578,2556,1641],{"class":1679},[1578,2558,1611],{"class":1594},[1578,2560,2422],{"class":1607},[1578,2562,1611],{"class":1594},[1578,2564,1648],{"class":1679},[1578,2566,1614],{"class":1594},[1578,2568,2569],{"class":1580,"line":1837},[1578,2570,1621],{"emptyLinePlaceholder":1620},[1578,2572,2573,2576,2578,2581,2583,2586,2589,2591,2593,2595,2597,2599,2601,2604,2606,2608,2611,2613,2616,2618,2620],{"class":1580,"line":1843},[1578,2574,2575],{"class":1591},"    store",[1578,2577,1595],{"class":1594},[1578,2579,2580],{"class":1637},"add",[1578,2582,1641],{"class":1679},[1578,2584,2585],{"class":1594},"{",[1578,2587,2588],{"class":1679}," id",[1578,2590,2435],{"class":1594},[1578,2592,2343],{"class":1711},[1578,2594,1946],{"class":1594},[1578,2596,1803],{"class":1679},[1578,2598,2435],{"class":1594},[1578,2600,1604],{"class":1594},[1578,2602,2603],{"class":1607},"Alice",[1578,2605,1611],{"class":1594},[1578,2607,1946],{"class":1594},[1578,2609,2610],{"class":1679}," age",[1578,2612,2435],{"class":1594},[1578,2614,2615],{"class":1711}," 25",[1578,2617,2445],{"class":1594},[1578,2619,1648],{"class":1679},[1578,2621,1614],{"class":1594},[1578,2623,2624],{"class":1580,"line":1848},[1578,2625,1621],{"emptyLinePlaceholder":1620},[1578,2627,2629,2631,2633,2636,2638,2640,2642,2644,2646,2648,2650,2652,2654,2656],{"class":1580,"line":2628},15,[1578,2630,2575],{"class":1591},[1578,2632,1595],{"class":1594},[1578,2634,2635],{"class":1637},"get",[1578,2637,1641],{"class":1679},[1578,2639,1815],{"class":1711},[1578,2641,1648],{"class":1679},[1578,2643,1595],{"class":1594},[1578,2645,2467],{"class":1637},[1578,2647,1663],{"class":1594},[1578,2649,2366],{"class":1633},[1578,2651,1700],{"class":1594},[1578,2653,2371],{"class":1644},[1578,2655,1648],{"class":1594},[1578,2657,1651],{"class":1594},[1578,2659,2661,2664,2666,2668,2670,2672,2674,2676,2678,2680,2682,2684],{"class":1580,"line":2660},16,[1578,2662,2663],{"class":1591},"        console",[1578,2665,1595],{"class":1594},[1578,2667,1856],{"class":1637},[1578,2669,1641],{"class":1679},[1578,2671,2371],{"class":1591},[1578,2673,1595],{"class":1594},[1578,2675,2392],{"class":1591},[1578,2677,1595],{"class":1594},[1578,2679,2397],{"class":1591},[1578,2681,1648],{"class":1679},[1578,2683,1715],{"class":1594},[1578,2685,2686],{"class":1584}," // 输出用户对象\n",[1578,2688,2690],{"class":1580,"line":2689},17,[1578,2691,2692],{"class":1594},"    };\n",[1578,2694,2696],{"class":1580,"line":2695},18,[1578,2697,2454],{"class":1594},[1578,2699,2701],{"class":1580,"line":2700},19,[1578,2702,1621],{"emptyLinePlaceholder":1620},[1578,2704,2706,2708,2710,2713,2715,2717,2719,2721,2723],{"class":1580,"line":2705},20,[1578,2707,2356],{"class":1591},[1578,2709,1595],{"class":1594},[1578,2711,2712],{"class":1637},"onerror",[1578,2714,1663],{"class":1594},[1578,2716,2366],{"class":1633},[1578,2718,1700],{"class":1594},[1578,2720,2371],{"class":1644},[1578,2722,1648],{"class":1594},[1578,2724,1651],{"class":1594},[1578,2726,2728,2731,2733,2736,2738,2740,2743,2745,2747,2749,2751],{"class":1580,"line":2727},21,[1578,2729,2730],{"class":1591},"    console",[1578,2732,1595],{"class":1594},[1578,2734,2735],{"class":1637},"error",[1578,2737,1641],{"class":1679},[1578,2739,1611],{"class":1594},[1578,2741,2742],{"class":1607},"数据库打开失败",[1578,2744,1611],{"class":1594},[1578,2746,1946],{"class":1594},[1578,2748,2387],{"class":1591},[1578,2750,1648],{"class":1679},[1578,2752,1614],{"class":1594},[1578,2754,2756],{"class":1580,"line":2755},22,[1578,2757,2454],{"class":1594},[1880,2759,2760],{},[1530,2761,2762],{},"IndexedDB 适合存储大量数据，如离线缓存、图片、多媒体文件等。",[1534,2764],{},[1525,2766,2768],{"id":2767},"️-如何选择合适的存储方式","⚖️ 如何选择合适的存储方式？",[1547,2770,2771,2774,2777,2780],{},[1550,2772,2773],{},"需要和服务器交互的少量数据，或者需要设置过期时间，选择 Cookie。",[1550,2775,2776],{},"需要长期存储且容量较小，选择 localStorage。",[1550,2778,2779],{},"临时数据，页面会话内有效，选择 sessionStorage。",[1550,2781,2782],{},"需要存储大量结构化数据，甚至二进制文件，选择 IndexedDB。",[1534,2784],{},[1525,2786,2788],{"id":2787},"小节总结","🧾 小节总结",[1547,2790,2791,2794,2797,2800],{},[1550,2792,2793],{},"Cookie 适合少量数据，随请求发送，适用于登录、追踪等。",[1550,2795,2796],{},"localStorage 和 sessionStorage 容量更大，适合持久或会话存储，数据类型限于字符串。",[1550,2798,2799],{},"IndexedDB 是功能强大的浏览器内数据库，适合海量结构化数据的存储。",[1550,2801,2802],{},"选择存储方式要根据数据大小、生命周期及是否需服务器交互灵活决定。",[1534,2804],{},[1525,2806,2808],{"id":2807},"知识问答qa","❓ 知识问答（Q&A）",[1530,2810,2811],{},"Q：Cookie 和 localStorage 的最大区别是什么？",[1530,2813,2814],{},"A：Cookie 会随每次请求自动发送给服务器，容量较小；localStorage 容量较大且不会自动发送，只在客户端使用。",[1530,2816,2817],{},"Q：为什么 sessionStorage 关闭标签页后数据会消失？",[1530,2819,2820],{},"A：sessionStorage 的设计目的是保存当前会话内的数据，一旦关闭标签页，浏览器会清除对应的 sessionStorage。",[1530,2822,2823],{},"Q：IndexedDB 为什么比 localStorage 复杂？",[1530,2825,2826],{},"A：IndexedDB 是异步的数据库系统，支持事务和索引，能存储更多类型的数据，操作上需要写更多代码。",[1534,2828],{},[1525,2830,2832],{"id":2831},"小练习","🧪 小练习",[1530,2834,2835],{},"练习 1：使用 localStorage 实现一个简单的主题切换器，用户选择主题后刷新页面仍保持选择。",[1568,2837,2841],{"className":2838,"code":2839,"language":2840,"meta":1573,"style":1573},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cbutton id=\"btn-light\">浅色主题\u003C/button>\n\u003Cbutton id=\"btn-dark\">深色主题\u003C/button>\n\n\u003Cscript>\n    // 在这里写代码\n\u003C/script>\n\n\u003Cstyle>\n    body.light {\n        background: #fff;\n        color: #000;\n    }\n    body.dark {\n        background: #000;\n        color: #fff;\n    }\n\u003C/style>\n","html",[1575,2842,2843,2877,2905,2909,2918,2923,2931,2935,2944,2957,2973,2987,2991,3001,3013,3025,3029],{"__ignoreMap":1573},[1578,2844,2845,2848,2851,2853,2855,2858,2861,2863,2866,2869,2872,2874],{"class":1580,"line":1581},[1578,2846,2847],{"class":1594},"\u003C",[1578,2849,2850],{"class":1679},"button",[1578,2852,2588],{"class":1633},[1578,2854,1601],{"class":1594},[1578,2856,2857],{"class":1594},"\"",[1578,2859,2860],{"class":1607},"btn-light",[1578,2862,2857],{"class":1594},[1578,2864,2865],{"class":1594},">",[1578,2867,2868],{"class":1591},"浅色主题",[1578,2870,2871],{"class":1594},"\u003C/",[1578,2873,2850],{"class":1679},[1578,2875,2876],{"class":1594},">\n",[1578,2878,2879,2881,2883,2885,2887,2889,2892,2894,2896,2899,2901,2903],{"class":1580,"line":1588},[1578,2880,2847],{"class":1594},[1578,2882,2850],{"class":1679},[1578,2884,2588],{"class":1633},[1578,2886,1601],{"class":1594},[1578,2888,2857],{"class":1594},[1578,2890,2891],{"class":1607},"btn-dark",[1578,2893,2857],{"class":1594},[1578,2895,2865],{"class":1594},[1578,2897,2898],{"class":1591},"深色主题",[1578,2900,2871],{"class":1594},[1578,2902,2850],{"class":1679},[1578,2904,2876],{"class":1594},[1578,2906,2907],{"class":1580,"line":1617},[1578,2908,1621],{"emptyLinePlaceholder":1620},[1578,2910,2911,2913,2916],{"class":1580,"line":1624},[1578,2912,2847],{"class":1594},[1578,2914,2915],{"class":1679},"script",[1578,2917,2876],{"class":1594},[1578,2919,2920],{"class":1580,"line":1630},[1578,2921,2922],{"class":1584},"    // 在这里写代码\n",[1578,2924,2925,2927,2929],{"class":1580,"line":1654},[1578,2926,2871],{"class":1594},[1578,2928,2915],{"class":1679},[1578,2930,2876],{"class":1594},[1578,2932,2933],{"class":1580,"line":1693},[1578,2934,1621],{"emptyLinePlaceholder":1620},[1578,2936,2937,2939,2942],{"class":1580,"line":1743},[1578,2938,2847],{"class":1594},[1578,2940,2941],{"class":1679},"style",[1578,2943,2876],{"class":1594},[1578,2945,2946,2950,2952,2955],{"class":1580,"line":1781},[1578,2947,2949],{"class":2948},"sYGMc","    body",[1578,2951,1595],{"class":1594},[1578,2953,2954],{"class":2948},"light",[1578,2956,1651],{"class":1594},[1578,2958,2959,2963,2965,2968,2971],{"class":1580,"line":1822},[1578,2960,2962],{"class":2961},"sug0G","        background",[1578,2964,2435],{"class":1594},[1578,2966,2967],{"class":1594}," #",[1578,2969,2970],{"class":1591},"fff",[1578,2972,1614],{"class":1594},[1578,2974,2975,2978,2980,2982,2985],{"class":1580,"line":1828},[1578,2976,2977],{"class":2961},"        color",[1578,2979,2435],{"class":1594},[1578,2981,2967],{"class":1594},[1578,2983,2984],{"class":1591},"000",[1578,2986,1614],{"class":1594},[1578,2988,2989],{"class":1580,"line":1837},[1578,2990,1825],{"class":1594},[1578,2992,2993,2995,2997,2999],{"class":1580,"line":1843},[1578,2994,2949],{"class":2948},[1578,2996,1595],{"class":1594},[1578,2998,1951],{"class":2948},[1578,3000,1651],{"class":1594},[1578,3002,3003,3005,3007,3009,3011],{"class":1580,"line":1848},[1578,3004,2962],{"class":2961},[1578,3006,2435],{"class":1594},[1578,3008,2967],{"class":1594},[1578,3010,2984],{"class":1591},[1578,3012,1614],{"class":1594},[1578,3014,3015,3017,3019,3021,3023],{"class":1580,"line":2628},[1578,3016,2977],{"class":2961},[1578,3018,2435],{"class":1594},[1578,3020,2967],{"class":1594},[1578,3022,2970],{"class":1591},[1578,3024,1614],{"class":1594},[1578,3026,3027],{"class":1580,"line":2660},[1578,3028,1825],{"class":1594},[1578,3030,3031,3033,3035],{"class":1580,"line":2689},[1578,3032,2871],{"class":1594},[1578,3034,2941],{"class":1679},[1578,3036,2876],{"class":1594},[1530,3038,3039],{},"练习 2：用 IndexedDB 创建一个笔记应用，支持添加和查询笔记（只需实现数据增加和查询功能即可）。",[1568,3041,3043],{"className":1570,"code":3042,"language":1572,"meta":1573,"style":1573},"// 初始化数据库代码\nvar request = indexedDB.open('notesDB', 1);\nrequest.onupgradeneeded = function (event) {\n    var db = event.target.result;\n    db.createObjectStore('notes', { keyPath: 'id', autoIncrement: true });\n};\nrequest.onsuccess = function (event) {\n    var db = event.target.result;\n    // 在这里实现添加和查询笔记功能\n};\nrequest.onerror = function () {\n    console.error('数据库打开失败');\n};\n",[1575,3044,3045,3050,3081,3101,3121,3170,3174,3194,3214,3219,3223,3240,3260],{"__ignoreMap":1573},[1578,3046,3047],{"class":1580,"line":1581},[1578,3048,3049],{"class":1584},"// 初始化数据库代码\n",[1578,3051,3052,3054,3056,3058,3060,3062,3064,3066,3068,3071,3073,3075,3077,3079],{"class":1580,"line":1588},[1578,3053,1703],{"class":1633},[1578,3055,2319],{"class":1591},[1578,3057,1601],{"class":1594},[1578,3059,2324],{"class":1591},[1578,3061,1595],{"class":1594},[1578,3063,2329],{"class":1637},[1578,3065,1641],{"class":1591},[1578,3067,1611],{"class":1594},[1578,3069,3070],{"class":1607},"notesDB",[1578,3072,1611],{"class":1594},[1578,3074,1946],{"class":1594},[1578,3076,2343],{"class":1711},[1578,3078,1648],{"class":1591},[1578,3080,1614],{"class":1594},[1578,3082,3083,3085,3087,3089,3091,3093,3095,3097,3099],{"class":1580,"line":1617},[1578,3084,2356],{"class":1591},[1578,3086,1595],{"class":1594},[1578,3088,2361],{"class":1637},[1578,3090,1663],{"class":1594},[1578,3092,2366],{"class":1633},[1578,3094,1700],{"class":1594},[1578,3096,2371],{"class":1644},[1578,3098,1648],{"class":1594},[1578,3100,1651],{"class":1594},[1578,3102,3103,3105,3107,3109,3111,3113,3115,3117,3119],{"class":1580,"line":1624},[1578,3104,1657],{"class":1633},[1578,3106,2382],{"class":1591},[1578,3108,1663],{"class":1594},[1578,3110,2387],{"class":1591},[1578,3112,1595],{"class":1594},[1578,3114,2392],{"class":1591},[1578,3116,1595],{"class":1594},[1578,3118,2397],{"class":1591},[1578,3120,1614],{"class":1594},[1578,3122,3123,3126,3128,3130,3132,3134,3137,3139,3141,3143,3145,3147,3149,3151,3153,3155,3158,3160,3164,3166,3168],{"class":1580,"line":1630},[1578,3124,3125],{"class":1591},"    db",[1578,3127,1595],{"class":1594},[1578,3129,2415],{"class":1637},[1578,3131,1641],{"class":1679},[1578,3133,1611],{"class":1594},[1578,3135,3136],{"class":1607},"notes",[1578,3138,1611],{"class":1594},[1578,3140,1946],{"class":1594},[1578,3142,2429],{"class":1594},[1578,3144,2432],{"class":1679},[1578,3146,2435],{"class":1594},[1578,3148,1604],{"class":1594},[1578,3150,2440],{"class":1607},[1578,3152,1611],{"class":1594},[1578,3154,1946],{"class":1594},[1578,3156,3157],{"class":1679}," autoIncrement",[1578,3159,2435],{"class":1594},[1578,3161,3163],{"class":3162},"sPKOg"," true",[1578,3165,2445],{"class":1594},[1578,3167,1648],{"class":1679},[1578,3169,1614],{"class":1594},[1578,3171,3172],{"class":1580,"line":1654},[1578,3173,2454],{"class":1594},[1578,3175,3176,3178,3180,3182,3184,3186,3188,3190,3192],{"class":1580,"line":1693},[1578,3177,2356],{"class":1591},[1578,3179,1595],{"class":1594},[1578,3181,2467],{"class":1637},[1578,3183,1663],{"class":1594},[1578,3185,2366],{"class":1633},[1578,3187,1700],{"class":1594},[1578,3189,2371],{"class":1644},[1578,3191,1648],{"class":1594},[1578,3193,1651],{"class":1594},[1578,3195,3196,3198,3200,3202,3204,3206,3208,3210,3212],{"class":1580,"line":1743},[1578,3197,1657],{"class":1633},[1578,3199,2382],{"class":1591},[1578,3201,1663],{"class":1594},[1578,3203,2387],{"class":1591},[1578,3205,1595],{"class":1594},[1578,3207,2392],{"class":1591},[1578,3209,1595],{"class":1594},[1578,3211,2397],{"class":1591},[1578,3213,1614],{"class":1594},[1578,3215,3216],{"class":1580,"line":1781},[1578,3217,3218],{"class":1584},"    // 在这里实现添加和查询笔记功能\n",[1578,3220,3221],{"class":1580,"line":1822},[1578,3222,2454],{"class":1594},[1578,3224,3225,3227,3229,3231,3233,3235,3238],{"class":1580,"line":1828},[1578,3226,2356],{"class":1591},[1578,3228,1595],{"class":1594},[1578,3230,2712],{"class":1637},[1578,3232,1663],{"class":1594},[1578,3234,2366],{"class":1633},[1578,3236,3237],{"class":1594}," ()",[1578,3239,1651],{"class":1594},[1578,3241,3242,3244,3246,3248,3250,3252,3254,3256,3258],{"class":1580,"line":1837},[1578,3243,2730],{"class":1591},[1578,3245,1595],{"class":1594},[1578,3247,2735],{"class":1637},[1578,3249,1641],{"class":1679},[1578,3251,1611],{"class":1594},[1578,3253,2742],{"class":1607},[1578,3255,1611],{"class":1594},[1578,3257,1648],{"class":1679},[1578,3259,1614],{"class":1594},[1578,3261,3262],{"class":1580,"line":1843},[1578,3263,2454],{"class":1594},[1534,3265],{},[1530,3267,3268],{},"🎉 恭喜你已经掌握 Cookie、localStorage、sessionStorage、IndexedDB 技能啦！这些浏览器存储技术是前端开发中不可或缺的利器，灵活运用它们能让你开发出更强大、用户体验更好的 web 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