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87",[1554,1772,1767],{"class":1568},[1554,1774,1775],{"class":1607}," 92",[1554,1777,1778],{"class":1564},"]",[1554,1780,1589],{"class":1568},[1554,1782,1783],{"class":1556,"line":1613},[1554,1784,1638],{"emptyLinePlaceholder":1637},[1554,1786,1787],{"class":1556,"line":1634},[1554,1788,1789],{"class":1740},"// 也可以用泛型写法\n",[1554,1791,1792,1794,1797,1799,1802,1805,1807,1810,1812,1814,1816,1819,1821,1823,1825,1827,1829,1831,1833,1836,1838,1840],{"class":1556,"line":1641},[1554,1793,1561],{"class":1560},[1554,1795,1796],{"class":1564}," names",[1554,1798,1569],{"class":1568},[1554,1800,1801],{"class":1572}," Array",[1554,1803,1804],{"class":1568},"\u003C",[1554,1806,1684],{"class":1572},[1554,1808,1809],{"class":1568},">",[1554,1811,1576],{"class":1568},[1554,1813,1761],{"class":1564},[1554,1815,1586],{"class":1568},[1554,1817,1818],{"class":1582},"小红",[1554,1820,1586],{"class":1568},[1554,1822,1767],{"class":1568},[1554,1824,1579],{"class":1568},[1554,1826,1583],{"class":1582},[1554,1828,1586],{"class":1568},[1554,1830,1767],{"class":1568},[1554,1832,1579],{"class":1568},[1554,1834,1835],{"class":1582},"小刚",[1554,1837,1586],{"class":1568},[1554,1839,1778],{"class":1564},[1554,1841,1589],{"class":1568},[1554,1843,1844],{"class":1556,"line":1659},[1554,1845,1638],{"emptyLinePlaceholder":1637},[1554,1847,1849],{"class":1556,"line":1848},7,[1554,1850,1851],{"class":1740},"// 元组：长度固定，每个位置类型不同\n",[1554,1853,1855,1857,1860,1862,1864,1866,1868,1870,1873,1875,1877,1879,1881,1883,1885,1887,1889],{"class":1556,"line":1854},8,[1554,1856,1561],{"class":1560},[1554,1858,1859],{"class":1564}," user",[1554,1861,1569],{"class":1568},[1554,1863,1761],{"class":1564},[1554,1865,1684],{"class":1572},[1554,1867,1767],{"class":1568},[1554,1869,1602],{"class":1572},[1554,1871,1872],{"class":1564},"] ",[1554,1874,1758],{"class":1568},[1554,1876,1761],{"class":1564},[1554,1878,1586],{"class":1568},[1554,1880,1583],{"class":1582},[1554,1882,1586],{"class":1568},[1554,1884,1767],{"class":1568},[1554,1886,1608],{"class":1607},[1554,1888,1778],{"class":1564},[1554,1890,1589],{"class":1568},[1530,1892,1893],{},"数组很直观，就是一列同类型数据。元组更适合描述“记录”，比如用户信息第一项是名字字符串，第二项是年龄数字。",[1709,1895,1896],{},[1530,1897,1898],{},"元组的长度和类型顺序是固定的，访问时可以通过索引直接获得对应类型的值。",[1534,1900],{},[1525,1902,1904],{"id":1903},"anyunknownvoidnever","🔵 any、unknown、void、never",[1530,1906,1907],{},"这几个类型是 TypeScript 里比较特殊的类型。",[1544,1909,1911],{"className":1546,"code":1910,"language":1548,"meta":1549,"style":1549},"let anything: any = 123;\nanything = '变成字符串了';\nanything = true; // any 允许赋值任何类型\n\nlet notSure: unknown = 10;\nnotSure = 'hello'; // unknown 也可以赋任何值，但不能随意操作\n\nfunction sayHello(): void {\n    console.log('Hello');\n}\n\nfunction throwError(): never {\n    throw new Error('出错了！');\n}\n",[1551,1912,1913,1933,1949,1963,1967,1986,2005,2009,2027,2055,2061,2066,2081,2107],{"__ignoreMap":1549},[1554,1914,1915,1918,1921,1923,1926,1928,1931],{"class":1556,"line":1557},[1554,1916,1917],{"class":1560},"let",[1554,1919,1920],{"class":1564}," anything",[1554,1922,1569],{"class":1568},[1554,1924,1925],{"class":1572}," any",[1554,1927,1576],{"class":1568},[1554,1929,1930],{"class":1607}," 123",[1554,1932,1589],{"class":1568},[1554,1934,1935,1938,1940,1942,1945,1947],{"class":1556,"line":1592},[1554,1936,1937],{"class":1564},"anything ",[1554,1939,1758],{"class":1568},[1554,1941,1579],{"class":1568},[1554,1943,1944],{"class":1582},"变成字符串了",[1554,1946,1586],{"class":1568},[1554,1948,1589],{"class":1568},[1554,1950,1951,1953,1955,1957,1960],{"class":1556,"line":1613},[1554,1952,1937],{"class":1564},[1554,1954,1758],{"class":1568},[1554,1956,1629],{"class":1628},[1554,1958,1959],{"class":1568},";",[1554,1961,1962],{"class":1740}," // any 允许赋值任何类型\n",[1554,1964,1965],{"class":1556,"line":1634},[1554,1966,1638],{"emptyLinePlaceholder":1637},[1554,1968,1969,1971,1974,1976,1979,1981,1984],{"class":1556,"line":1641},[1554,1970,1917],{"class":1560},[1554,1972,1973],{"class":1564}," notSure",[1554,1975,1569],{"class":1568},[1554,1977,1978],{"class":1572}," unknown",[1554,1980,1576],{"class":1568},[1554,1982,1983],{"class":1607}," 10",[1554,1985,1589],{"class":1568},[1554,1987,1988,1991,1993,1995,1998,2000,2002],{"class":1556,"line":1659},[1554,1989,1990],{"class":1564},"notSure ",[1554,1992,1758],{"class":1568},[1554,1994,1579],{"class":1568},[1554,1996,1997],{"class":1582},"hello",[1554,1999,1586],{"class":1568},[1554,2001,1959],{"class":1568},[1554,2003,2004],{"class":1740}," // unknown 也可以赋任何值，但不能随意操作\n",[1554,2006,2007],{"class":1556,"line":1848},[1554,2008,1638],{"emptyLinePlaceholder":1637},[1554,2010,2011,2014,2018,2021,2024],{"class":1556,"line":1854},[1554,2012,2013],{"class":1560},"function",[1554,2015,2017],{"class":2016},"swgpB"," sayHello",[1554,2019,2020],{"class":1568},"():",[1554,2022,2023],{"class":1572}," void",[1554,2025,2026],{"class":1568}," {\n",[1554,2028,2030,2033,2036,2039,2043,2045,2048,2050,2053],{"class":1556,"line":2029},9,[1554,2031,2032],{"class":1564},"    console",[1554,2034,2035],{"class":1568},".",[1554,2037,2038],{"class":2016},"log",[1554,2040,2042],{"class":2041},"sd2Uz","(",[1554,2044,1586],{"class":1568},[1554,2046,2047],{"class":1582},"Hello",[1554,2049,1586],{"class":1568},[1554,2051,2052],{"class":2041},")",[1554,2054,1589],{"class":1568},[1554,2056,2058],{"class":1556,"line":2057},10,[1554,2059,2060],{"class":1568},"}\n",[1554,2062,2064],{"class":1556,"line":2063},11,[1554,2065,1638],{"emptyLinePlaceholder":1637},[1554,2067,2069,2071,2074,2076,2079],{"class":1556,"line":2068},12,[1554,2070,2013],{"class":1560},[1554,2072,2073],{"class":2016}," throwError",[1554,2075,2020],{"class":1568},[1554,2077,2078],{"class":1572}," never",[1554,2080,2026],{"class":1568},[1554,2082,2084,2088,2091,2094,2096,2098,2101,2103,2105],{"class":1556,"line":2083},13,[1554,2085,2087],{"class":2086},"s8pZq","    throw",[1554,2089,2090],{"class":1568}," new",[1554,2092,2093],{"class":2016}," Error",[1554,2095,2042],{"class":2041},[1554,2097,1586],{"class":1568},[1554,2099,2100],{"class":1582},"出错了！",[1554,2102,1586],{"class":1568},[1554,2104,2052],{"class":2041},[1554,2106,1589],{"class":1568},[1554,2108,2110],{"class":1556,"line":2109},14,[1554,2111,2060],{"class":1568},[1676,2113,2114,2120,2126,2132],{},[1679,2115,2116,2119],{},[1682,2117,2118],{},"any"," 表示“任何类型”，关闭了类型检查，有点像放弃类型安全。建议少用。",[1679,2121,2122,2125],{},[1682,2123,2124],{},"unknown"," 表示“未知类型”，相比 any 更安全，使用前需要做类型检查。",[1679,2127,2128,2131],{},[1682,2129,2130],{},"void"," 通常用作函数没有返回值时的返回类型。",[1679,2133,2134,2137],{},[1682,2135,2136],{},"never"," 表示永远不会有返回值的类型，常用于抛出异常或死循环。",[2139,2140,2141],"warning",{},[1530,2142,2143,2144,2146],{},"使用 ",[1682,2145,2118],{}," 类型会破坏 TypeScript 的类型安全，只有在极特殊情况下才推荐使用。",[1530,2148,2149,2150,2152,2153,2155],{},"生活中的比喻是，",[1682,2151,2118],{}," 就像是一张白纸，你可以画任何东西；",[1682,2154,2124],{}," 是一张盖着的纸，你得先掀开看清楚才能操作。",[1534,2157],{},[1525,2159,2161],{"id":2160},"️-函数参数与返回值类型","⚙️ 函数参数与返回值类型",[1530,2163,2164],{},"在前端开发中，函数是核心组成部分。给函数参数和返回值标注类型，可以让代码更严谨，减少运行时错误。",[1544,2166,2170],{"className":2167,"code":2168,"language":2169,"meta":1549,"style":1549},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","function add(x: number, y: number): number {\n    return x + y;\n}\n","ts",[1551,2171,2172,2205,2220],{"__ignoreMap":1549},[1554,2173,2174,2176,2179,2181,2185,2187,2189,2191,2194,2196,2198,2201,2203],{"class":1556,"line":1557},[1554,2175,2013],{"class":1560},[1554,2177,2178],{"class":2016}," add",[1554,2180,2042],{"class":1568},[1554,2182,2184],{"class":2183},"sK9QF","x",[1554,2186,1569],{"class":1568},[1554,2188,1602],{"class":1572},[1554,2190,1767],{"class":1568},[1554,2192,2193],{"class":2183}," y",[1554,2195,1569],{"class":1568},[1554,2197,1602],{"class":1572},[1554,2199,2200],{"class":1568},"):",[1554,2202,1602],{"class":1572},[1554,2204,2026],{"class":1568},[1554,2206,2207,2210,2213,2216,2218],{"class":1556,"line":1592},[1554,2208,2209],{"class":2086},"    return",[1554,2211,2212],{"class":1564}," x",[1554,2214,2215],{"class":1568}," +",[1554,2217,2193],{"class":1564},[1554,2219,1589],{"class":1568},[1554,2221,2222],{"class":1556,"line":1613},[1554,2223,2060],{"class":1568},[1530,2225,2226,2227,2230,2231,1703,2233,2236,2237,2239,2240,2242],{},"这个例子中，函数 ",[1551,2228,2229],{},"add"," 的参数 ",[1551,2232,2184],{},[1551,2234,2235],{},"y"," 都是 ",[1551,2238,1690],{}," 类型，返回值也是 ",[1551,2241,1690],{},"。当你调用时传入非数字类型，编译器会报错。",[1709,2244,2245],{},[1530,2246,2247],{},"给函数添加类型定义，不仅能帮你避免传错参数，还能让编辑器自动提示参数类型，提升开发效率。",[1534,2249],{},[1525,2251,2253],{"id":2252},"类型注解-vs-类型推断","🟣 类型注解 vs 类型推断",[1530,2255,2256],{},"TypeScript 的强大之处之一是它会自动推断变量的类型，但你也可以手动写类型注解。",[1544,2258,2260],{"className":1546,"code":2259,"language":1548,"meta":1549,"style":1549},"// 类型注解：明确说明类型\nconst count: number = 10;\n\n// 类型推断：没有写注解，TS 自动推断类型\nconst message = '你好，TS'; // 自动推断为 string\n\n// 函数参数类型注解\nfunction sum(a: number, b: number): number {\n    return a + b;\n}\n",[1551,2261,2262,2267,2284,2288,2293,2314,2318,2323,2354,2367],{"__ignoreMap":1549},[1554,2263,2264],{"class":1556,"line":1557},[1554,2265,2266],{"class":1740},"// 类型注解：明确说明类型\n",[1554,2268,2269,2271,2274,2276,2278,2280,2282],{"class":1556,"line":1592},[1554,2270,1561],{"class":1560},[1554,2272,2273],{"class":1564}," count",[1554,2275,1569],{"class":1568},[1554,2277,1602],{"class":1572},[1554,2279,1576],{"class":1568},[1554,2281,1983],{"class":1607},[1554,2283,1589],{"class":1568},[1554,2285,2286],{"class":1556,"line":1613},[1554,2287,1638],{"emptyLinePlaceholder":1637},[1554,2289,2290],{"class":1556,"line":1634},[1554,2291,2292],{"class":1740},"// 类型推断：没有写注解，TS 自动推断类型\n",[1554,2294,2295,2297,2300,2302,2304,2307,2309,2311],{"class":1556,"line":1641},[1554,2296,1561],{"class":1560},[1554,2298,2299],{"class":1564}," message ",[1554,2301,1758],{"class":1568},[1554,2303,1579],{"class":1568},[1554,2305,2306],{"class":1582},"你好，TS",[1554,2308,1586],{"class":1568},[1554,2310,1959],{"class":1568},[1554,2312,2313],{"class":1740}," // 自动推断为 string\n",[1554,2315,2316],{"class":1556,"line":1659},[1554,2317,1638],{"emptyLinePlaceholder":1637},[1554,2319,2320],{"class":1556,"line":1848},[1554,2321,2322],{"class":1740},"// 函数参数类型注解\n",[1554,2324,2325,2327,2330,2332,2335,2337,2339,2341,2344,2346,2348,2350,2352],{"class":1556,"line":1854},[1554,2326,2013],{"class":1560},[1554,2328,2329],{"class":2016}," sum",[1554,2331,2042],{"class":1568},[1554,2333,2334],{"class":2183},"a",[1554,2336,1569],{"class":1568},[1554,2338,1602],{"class":1572},[1554,2340,1767],{"class":1568},[1554,2342,2343],{"class":2183}," b",[1554,2345,1569],{"class":1568},[1554,2347,1602],{"class":1572},[1554,2349,2200],{"class":1568},[1554,2351,1602],{"class":1572},[1554,2353,2026],{"class":1568},[1554,2355,2356,2358,2361,2363,2365],{"class":1556,"line":2029},[1554,2357,2209],{"class":2086},[1554,2359,2360],{"class":1564}," a",[1554,2362,2215],{"class":1568},[1554,2364,2343],{"class":1564},[1554,2366,1589],{"class":1568},[1554,2368,2369],{"class":1556,"line":2057},[1554,2370,2060],{"class":1568},[1676,2372,2373,2376],{},[1679,2374,2375],{},"类型注解是显式告诉编译器变量是什么类型。",[1679,2377,2378],{},"类型推断是编译器通过变量的初始值自动判断类型。",[1709,2380,2381],{},[1530,2382,2383],{},"强烈推荐利用类型推断减少代码冗余，同时在有歧义或复杂数据时使用类型注解提高代码可读性。",[1530,2385,2386],{},"举个例子，TypeScript 就像你的贴心助理，帮你猜测变量是什么类型，但当猜不准时，你要告诉它准确信息。",[1534,2388],{},[1525,2390,2392],{"id":2391},"类型别名type与接口interface基础介绍","🟤 类型别名（type）与接口（interface）基础介绍",[2394,2395,2397],"h3",{"id":2396},"什么是类型别名type-alias","什么是类型别名（Type Alias）？",[1530,2399,2400],{},"类型别名使用 type 关键字来为一个类型起一个名字。可以是基本类型、联合类型、元组、对象等。",[1544,2402,2404],{"className":2167,"code":2403,"language":2169,"meta":1549,"style":1549},"type UserID = string;\n\ntype User = {\n    id: UserID;\n    name: string;\n    age?: number;\n};\n",[1551,2405,2406,2420,2424,2435,2446,2457,2469],{"__ignoreMap":1549},[1554,2407,2408,2411,2414,2416,2418],{"class":1556,"line":1557},[1554,2409,2410],{"class":1560},"type",[1554,2412,2413],{"class":1572}," UserID",[1554,2415,1576],{"class":1568},[1554,2417,1573],{"class":1572},[1554,2419,1589],{"class":1568},[1554,2421,2422],{"class":1556,"line":1592},[1554,2423,1638],{"emptyLinePlaceholder":1637},[1554,2425,2426,2428,2431,2433],{"class":1556,"line":1613},[1554,2427,2410],{"class":1560},[1554,2429,2430],{"class":1572}," User",[1554,2432,1576],{"class":1568},[1554,2434,2026],{"class":1568},[1554,2436,2437,2440,2442,2444],{"class":1556,"line":1634},[1554,2438,2439],{"class":2041},"    id",[1554,2441,1569],{"class":1568},[1554,2443,2413],{"class":1572},[1554,2445,1589],{"class":1568},[1554,2447,2448,2451,2453,2455],{"class":1556,"line":1641},[1554,2449,2450],{"class":2041},"    name",[1554,2452,1569],{"class":1568},[1554,2454,1573],{"class":1572},[1554,2456,1589],{"class":1568},[1554,2458,2459,2462,2465,2467],{"class":1556,"line":1659},[1554,2460,2461],{"class":2041},"    age",[1554,2463,2464],{"class":1568},"?:",[1554,2466,1602],{"class":1572},[1554,2468,1589],{"class":1568},[1554,2470,2471],{"class":1556,"line":1848},[1554,2472,2473],{"class":1568},"};\n",[2394,2475,2477],{"id":2476},"什么是接口interface","什么是接口（Interface）？",[1530,2479,2480],{},"接口是 TypeScript 提供的一种用于定义对象结构的方式，特别适合面向对象编程中的接口定义。使用 interface 关键字。",[1544,2482,2484],{"className":2167,"code":2483,"language":2169,"meta":1549,"style":1549},"interface User {\n    id: string;\n    name: string;\n    age?: number;\n}\n",[1551,2485,2486,2495,2505,2515,2525],{"__ignoreMap":1549},[1554,2487,2488,2491,2493],{"class":1556,"line":1557},[1554,2489,2490],{"class":1560},"interface",[1554,2492,2430],{"class":1572},[1554,2494,2026],{"class":1568},[1554,2496,2497,2499,2501,2503],{"class":1556,"line":1592},[1554,2498,2439],{"class":2041},[1554,2500,1569],{"class":1568},[1554,2502,1573],{"class":1572},[1554,2504,1589],{"class":1568},[1554,2506,2507,2509,2511,2513],{"class":1556,"line":1613},[1554,2508,2450],{"class":2041},[1554,2510,1569],{"class":1568},[1554,2512,1573],{"class":1572},[1554,2514,1589],{"class":1568},[1554,2516,2517,2519,2521,2523],{"class":1556,"line":1634},[1554,2518,2461],{"class":2041},[1554,2520,2464],{"class":1568},[1554,2522,1602],{"class":1572},[1554,2524,1589],{"class":1568},[1554,2526,2527],{"class":1556,"line":1641},[1554,2528,2060],{"class":1568},[1530,2530,2531],{},"接口也支持继承和合并，非常适合扩展型的结构设计。",[2394,2533,2535,2536,2538],{"id":2534},"场景-1定义对象结构-interface-更合适","场景 1：定义对象结构 ",[1551,2537,2490],{}," 更合适",[1544,2540,2542],{"className":2167,"code":2541,"language":2169,"meta":1549,"style":1549},"interface User {\n    id: number;\n    name: string;\n    age?: number;\n}\n",[1551,2543,2544,2552,2562,2572,2582],{"__ignoreMap":1549},[1554,2545,2546,2548,2550],{"class":1556,"line":1557},[1554,2547,2490],{"class":1560},[1554,2549,2430],{"class":1572},[1554,2551,2026],{"class":1568},[1554,2553,2554,2556,2558,2560],{"class":1556,"line":1592},[1554,2555,2439],{"class":2041},[1554,2557,1569],{"class":1568},[1554,2559,1602],{"class":1572},[1554,2561,1589],{"class":1568},[1554,2563,2564,2566,2568,2570],{"class":1556,"line":1613},[1554,2565,2450],{"class":2041},[1554,2567,1569],{"class":1568},[1554,2569,1573],{"class":1572},[1554,2571,1589],{"class":1568},[1554,2573,2574,2576,2578,2580],{"class":1556,"line":1634},[1554,2575,2461],{"class":2041},[1554,2577,2464],{"class":1568},[1554,2579,1602],{"class":1572},[1554,2581,1589],{"class":1568},[1554,2583,2584],{"class":1556,"line":1641},[1554,2585,2060],{"class":1568},[1530,2587,2588],{},[2589,2590,2591,2592,2594],"strong",{},"为什么用 ",[1551,2593,2490],{},"：",[1676,2596,2597,2600,2603],{},[1679,2598,2599],{},"更直观地表达“这是一个对象结构”；",[1679,2601,2602],{},"支持继承、合并；",[1679,2604,2605],{},"更适合被他人扩展，尤其是在写库或声明文件时。",[2394,2607,2609,2610],{"id":2608},"场景-2定义联合类型必须用-type","场景 2：定义联合类型必须用 ",[1551,2611,2410],{},[1544,2613,2615],{"className":2167,"code":2614,"language":2169,"meta":1549,"style":1549},"type Status = 'loading' | 'success' | 'error';\n",[1551,2616,2617],{"__ignoreMap":1549},[1554,2618,2619,2621,2624,2626,2628,2631,2633,2636,2638,2641,2643,2645,2647,2650,2652],{"class":1556,"line":1557},[1554,2620,2410],{"class":1560},[1554,2622,2623],{"class":1572}," Status",[1554,2625,1576],{"class":1568},[1554,2627,1579],{"class":1568},[1554,2629,2630],{"class":1582},"loading",[1554,2632,1586],{"class":1568},[1554,2634,2635],{"class":1568}," |",[1554,2637,1579],{"class":1568},[1554,2639,2640],{"class":1582},"success",[1554,2642,1586],{"class":1568},[1554,2644,2635],{"class":1568},[1554,2646,1579],{"class":1568},[1554,2648,2649],{"class":1582},"error",[1554,2651,1586],{"class":1568},[1554,2653,1589],{"class":1568},[1530,2655,2656],{},[2589,2657,2591,2658,2594],{},[1551,2659,2410],{},[1676,2661,2662,2667],{},[1679,2663,2664,2666],{},[1551,2665,2490],{}," 不能用于联合类型；",[1679,2668,2669,2671],{},[1551,2670,2410],{}," 能描述字符串字面量的组合、可选值等。",[2394,2673,2675,2676],{"id":2674},"场景-3定义元组必须用-type","场景 3：定义元组必须用 ",[1551,2677,2410],{},[1544,2679,2681],{"className":2167,"code":2680,"language":2169,"meta":1549,"style":1549},"type Point = [number, number];\n",[1551,2682,2683],{"__ignoreMap":1549},[1554,2684,2685,2687,2690,2692,2694,2696,2698,2700,2702],{"class":1556,"line":1557},[1554,2686,2410],{"class":1560},[1554,2688,2689],{"class":1572}," Point",[1554,2691,1576],{"class":1568},[1554,2693,1761],{"class":1564},[1554,2695,1690],{"class":1572},[1554,2697,1767],{"class":1568},[1554,2699,1602],{"class":1572},[1554,2701,1778],{"class":1564},[1554,2703,1589],{"class":1568},[1530,2705,2706],{},[2589,2707,2591,2708,2594],{},[1551,2709,2410],{},[1676,2711,2712,2722],{},[1679,2713,2714,2715,2717,2718,2721],{},"只有 ",[1551,2716,2410],{}," 可以定义元组 ",[1551,2719,2720],{},"[x, y]","；",[1679,2723,2724,2726],{},[1551,2725,2490],{}," 不能直接表达这种有序固定长度的数组结构。",[2394,2728,2730,2731],{"id":2729},"场景-5需要扩展或合并多个结构必须用-interface","场景 5：需要扩展或合并多个结构必须用 ",[1551,2732,2490],{},[1544,2734,2736],{"className":2167,"code":2735,"language":2169,"meta":1549,"style":1549},"interface Animal {\n    name: string;\n}\n\ninterface Dog extends Animal {\n    breed: string;\n}\n",[1551,2737,2738,2747,2757,2761,2765,2779,2790],{"__ignoreMap":1549},[1554,2739,2740,2742,2745],{"class":1556,"line":1557},[1554,2741,2490],{"class":1560},[1554,2743,2744],{"class":1572}," Animal",[1554,2746,2026],{"class":1568},[1554,2748,2749,2751,2753,2755],{"class":1556,"line":1592},[1554,2750,2450],{"class":2041},[1554,2752,1569],{"class":1568},[1554,2754,1573],{"class":1572},[1554,2756,1589],{"class":1568},[1554,2758,2759],{"class":1556,"line":1613},[1554,2760,2060],{"class":1568},[1554,2762,2763],{"class":1556,"line":1634},[1554,2764,1638],{"emptyLinePlaceholder":1637},[1554,2766,2767,2769,2772,2775,2777],{"class":1556,"line":1641},[1554,2768,2490],{"class":1560},[1554,2770,2771],{"class":1572}," Dog",[1554,2773,2774],{"class":1560}," extends",[1554,2776,2744],{"class":1572},[1554,2778,2026],{"class":1568},[1554,2780,2781,2784,2786,2788],{"class":1556,"line":1659},[1554,2782,2783],{"class":2041},"    breed",[1554,2785,1569],{"class":1568},[1554,2787,1573],{"class":1572},[1554,2789,1589],{"class":1568},[1554,2791,2792],{"class":1556,"line":1848},[1554,2793,2060],{"class":1568},[1530,2795,2796],{},[2589,2797,2798],{},"或者声明合并：",[1544,2800,2802],{"className":2167,"code":2801,"language":2169,"meta":1549,"style":1549},"interface User {\n    id: number;\n}\ninterface User {\n    name: string;\n}\n// 合并后等同于：{ id: number; name: string }\n",[1551,2803,2804,2812,2822,2826,2834,2844,2848],{"__ignoreMap":1549},[1554,2805,2806,2808,2810],{"class":1556,"line":1557},[1554,2807,2490],{"class":1560},[1554,2809,2430],{"class":1572},[1554,2811,2026],{"class":1568},[1554,2813,2814,2816,2818,2820],{"class":1556,"line":1592},[1554,2815,2439],{"class":2041},[1554,2817,1569],{"class":1568},[1554,2819,1602],{"class":1572},[1554,2821,1589],{"class":1568},[1554,2823,2824],{"class":1556,"line":1613},[1554,2825,2060],{"class":1568},[1554,2827,2828,2830,2832],{"class":1556,"line":1634},[1554,2829,2490],{"class":1560},[1554,2831,2430],{"class":1572},[1554,2833,2026],{"class":1568},[1554,2835,2836,2838,2840,2842],{"class":1556,"line":1641},[1554,2837,2450],{"class":2041},[1554,2839,1569],{"class":1568},[1554,2841,1573],{"class":1572},[1554,2843,1589],{"class":1568},[1554,2845,2846],{"class":1556,"line":1659},[1554,2847,2060],{"class":1568},[1554,2849,2850],{"class":1556,"line":1848},[1554,2851,2852],{"class":1740},"// 合并后等同于：{ id: number; name: string }\n",[1530,2854,2855,2857],{},[1551,2856,2410],{}," 不能这么做（重复声明会报错）。",[1525,2859,2861],{"id":2860},"什么是枚举enum","什么是枚举（enum）？",[1530,2863,2864],{},"枚举（enum）是一种特殊的类型，用来定义一组命名的常量。它能帮你把一堆相关的值统一管理，代码也更清晰。枚举主要分为三种类型。",[2394,2866,2868],{"id":2867},"数字枚举numeric-enums","数字枚举（Numeric Enums）",[1530,2870,2871],{},"数字枚举是最常见的形式，枚举成员会自动从 0 开始编号，也可以手动指定初始值，后面的成员依次递增。",[1544,2873,2875],{"className":2167,"code":2874,"language":2169,"meta":1549,"style":1549},"enum Direction {\n    Up, // 0\n    Down, // 1\n    Left, // 2\n    Right, // 3\n}\n\nconsole.log(Direction.Left); // 2\n",[1551,2876,2877,2887,2897,2907,2917,2927,2931,2935],{"__ignoreMap":1549},[1554,2878,2879,2882,2885],{"class":1556,"line":1557},[1554,2880,2881],{"class":1560},"enum",[1554,2883,2884],{"class":1572}," Direction",[1554,2886,2026],{"class":1568},[1554,2888,2889,2892,2894],{"class":1556,"line":1592},[1554,2890,2891],{"class":1564},"    Up",[1554,2893,1767],{"class":1568},[1554,2895,2896],{"class":1740}," // 0\n",[1554,2898,2899,2902,2904],{"class":1556,"line":1613},[1554,2900,2901],{"class":1564},"    Down",[1554,2903,1767],{"class":1568},[1554,2905,2906],{"class":1740}," // 1\n",[1554,2908,2909,2912,2914],{"class":1556,"line":1634},[1554,2910,2911],{"class":1564},"    Left",[1554,2913,1767],{"class":1568},[1554,2915,2916],{"class":1740}," // 2\n",[1554,2918,2919,2922,2924],{"class":1556,"line":1641},[1554,2920,2921],{"class":1564},"    Right",[1554,2923,1767],{"class":1568},[1554,2925,2926],{"class":1740}," // 3\n",[1554,2928,2929],{"class":1556,"line":1659},[1554,2930,2060],{"class":1568},[1554,2932,2933],{"class":1556,"line":1848},[1554,2934,1638],{"emptyLinePlaceholder":1637},[1554,2936,2937,2940,2942,2944,2947,2949,2952,2954],{"class":1556,"line":1854},[1554,2938,2939],{"class":1564},"console",[1554,2941,2035],{"class":1568},[1554,2943,2038],{"class":2016},[1554,2945,2946],{"class":1564},"(Direction",[1554,2948,2035],{"class":1568},[1554,2950,2951],{"class":1564},"Left)",[1554,2953,1959],{"class":1568},[1554,2955,2916],{"class":1740},[2394,2957,2959],{"id":2958},"字符串枚举string-enums","字符串枚举（String Enums）",[1530,2961,2962],{},"字符串枚举的值必须显式赋值，因为它不会自动递增。字符串枚举更适合那些你希望值和名字保持一一对应，且能直接阅读的场景。",[1544,2964,2966],{"className":2167,"code":2965,"language":2169,"meta":1549,"style":1549},"enum Role {\n    Admin = 'ADMIN',\n    User = 'USER',\n    Guest = 'GUEST',\n}\n",[1551,2967,2968,2977,2994,3010,3026],{"__ignoreMap":1549},[1554,2969,2970,2972,2975],{"class":1556,"line":1557},[1554,2971,2881],{"class":1560},[1554,2973,2974],{"class":1572}," Role",[1554,2976,2026],{"class":1568},[1554,2978,2979,2982,2984,2986,2989,2991],{"class":1556,"line":1592},[1554,2980,2981],{"class":1564},"    Admin ",[1554,2983,1758],{"class":1568},[1554,2985,1579],{"class":1568},[1554,2987,2988],{"class":1582},"ADMIN",[1554,2990,1586],{"class":1568},[1554,2992,2993],{"class":1568},",\n",[1554,2995,2996,2999,3001,3003,3006,3008],{"class":1556,"line":1613},[1554,2997,2998],{"class":1564},"    User ",[1554,3000,1758],{"class":1568},[1554,3002,1579],{"class":1568},[1554,3004,3005],{"class":1582},"USER",[1554,3007,1586],{"class":1568},[1554,3009,2993],{"class":1568},[1554,3011,3012,3015,3017,3019,3022,3024],{"class":1556,"line":1634},[1554,3013,3014],{"class":1564},"    Guest ",[1554,3016,1758],{"class":1568},[1554,3018,1579],{"class":1568},[1554,3020,3021],{"class":1582},"GUEST",[1554,3023,1586],{"class":1568},[1554,3025,2993],{"class":1568},[1554,3027,3028],{"class":1556,"line":1641},[1554,3029,2060],{"class":1568},[2394,3031,3033],{"id":3032},"异构枚举heterogeneous-enums数字和字符串混合","异构枚举（Heterogeneous Enums，数字和字符串混合）",[1530,3035,3036],{},"异构枚举同时包含数字和字符串类型的成员，一般不推荐使用，因为会降低代码的统一性和可读性。",[1544,3038,3040],{"className":2167,"code":3039,"language":2169,"meta":1549,"style":1549},"enum Result {\n    Success = 1,\n    Fail = 'FAIL',\n}\n",[1551,3041,3042,3051,3063,3079],{"__ignoreMap":1549},[1554,3043,3044,3046,3049],{"class":1556,"line":1557},[1554,3045,2881],{"class":1560},[1554,3047,3048],{"class":1572}," Result",[1554,3050,2026],{"class":1568},[1554,3052,3053,3056,3058,3061],{"class":1556,"line":1592},[1554,3054,3055],{"class":1564},"    Success ",[1554,3057,1758],{"class":1568},[1554,3059,3060],{"class":1607}," 1",[1554,3062,2993],{"class":1568},[1554,3064,3065,3068,3070,3072,3075,3077],{"class":1556,"line":1613},[1554,3066,3067],{"class":1564},"    Fail ",[1554,3069,1758],{"class":1568},[1554,3071,1579],{"class":1568},[1554,3073,3074],{"class":1582},"FAIL",[1554,3076,1586],{"class":1568},[1554,3078,2993],{"class":1568},[1554,3080,3081],{"class":1556,"line":1634},[1554,3082,2060],{"class":1568},[1709,3084,3085],{},[1530,3086,3087],{},"小提示：枚举会在编译后生成对应的代码哦！",[1534,3089],{},[1525,3091,3093],{"id":3092},"小节总结","🧾 小节总结",[1676,3095,3096,3099,3102,3105,3108],{},[1679,3097,3098],{},"TypeScript 基本类型包括 string、number、boolean、null、undefined，都是描述变量基本数据形态。",[1679,3100,3101],{},"数组用来存储同类型集合，元组是长度固定、类型不同的数组。",[1679,3103,3104],{},"特殊类型 any 表示任意类型但不安全，unknown 更安全，void 代表无返回值，never 代表永远不返回。",[1679,3106,3107],{},"类型注解显式声明类型，类型推断自动推断，合理搭配提升代码安全易读。",[1679,3109,3110],{},"类型别名和接口都是给复杂类型起名字，但接口支持继承和实现，更适合面向对象设计。",[1534,3112],{},[1525,3114,3116],{"id":3115},"知识问答qa","❓ 知识问答（Q&A）",[1530,3118,3119,3120,1703,3122,3124],{},"Q：TypeScript 中，",[1682,3121,2118],{},[1682,3123,2124],{}," 有什么区别？",[1530,3126,3127,3128,3130,3131,3133],{},"A：",[1682,3129,2118],{}," 关闭类型检查，可以随意操作；",[1682,3132,2124],{}," 更安全，使用前必须先做类型检查。",[1530,3135,3136],{},"Q：什么情况下适合用元组而不是数组？",[1530,3138,3139],{},"A：当数据长度固定且每个位置类型不同，比如用户信息时，适合用元组。",[1530,3141,3142],{},"Q：接口和类型别名的主要区别是什么？",[1530,3144,3145],{},"A：接口支持继承和实现，适合面向对象设计；类型别名更灵活，能定义联合类型等。",[1534,3147],{},[1525,3149,3151],{"id":3150},"小练习","🧪 小练习",[1530,3153,3154],{},"练习 1：写一个类型别名，表示一个商品对象，包含名字（字符串）、价格（数字）、是否有库存（布尔）。",[1544,3156,3158],{"className":1546,"code":3157,"language":1548,"meta":1549,"style":1549},"type Product = {\n    // 在这里写你的代码\n};\n\nconst phone: Product = {\n    // 在这里初始化 phone 对象\n};\n",[1551,3159,3160,3171,3176,3180,3184,3199,3204],{"__ignoreMap":1549},[1554,3161,3162,3164,3167,3169],{"class":1556,"line":1557},[1554,3163,2410],{"class":1560},[1554,3165,3166],{"class":1572}," Product",[1554,3168,1576],{"class":1568},[1554,3170,2026],{"class":1568},[1554,3172,3173],{"class":1556,"line":1592},[1554,3174,3175],{"class":1740},"    // 在这里写你的代码\n",[1554,3177,3178],{"class":1556,"line":1613},[1554,3179,2473],{"class":1568},[1554,3181,3182],{"class":1556,"line":1634},[1554,3183,1638],{"emptyLinePlaceholder":1637},[1554,3185,3186,3188,3191,3193,3195,3197],{"class":1556,"line":1641},[1554,3187,1561],{"class":1560},[1554,3189,3190],{"class":1564}," phone",[1554,3192,1569],{"class":1568},[1554,3194,3166],{"class":1572},[1554,3196,1576],{"class":1568},[1554,3198,2026],{"class":1568},[1554,3200,3201],{"class":1556,"line":1659},[1554,3202,3203],{"class":1740},"    // 在这里初始化 phone 对象\n",[1554,3205,3206],{"class":1556,"line":1848},[1554,3207,2473],{"class":1568},[1530,3209,3210],{},"练习 2：写一个函数，接受一个元组类型参数，表示人的名字和年龄，函数返回字符串介绍该人。",[1544,3212,3214],{"className":1546,"code":3213,"language":1548,"meta":1549,"style":1549},"function introduce(person: [string, number]): string {\n    // 在这里写你的代码\n}\n\nconsole.log(introduce(['小明', 25])); // 输出示例：我是小明，今年25岁。\n",[1551,3215,3216,3246,3250,3254,3258],{"__ignoreMap":1549},[1554,3217,3218,3220,3223,3225,3228,3230,3232,3234,3236,3238,3240,3242,3244],{"class":1556,"line":1557},[1554,3219,2013],{"class":1560},[1554,3221,3222],{"class":2016}," introduce",[1554,3224,2042],{"class":1568},[1554,3226,3227],{"class":2183},"person",[1554,3229,1569],{"class":1568},[1554,3231,1761],{"class":1564},[1554,3233,1684],{"class":1572},[1554,3235,1767],{"class":1568},[1554,3237,1602],{"class":1572},[1554,3239,1778],{"class":1564},[1554,3241,2200],{"class":1568},[1554,3243,1573],{"class":1572},[1554,3245,2026],{"class":1568},[1554,3247,3248],{"class":1556,"line":1592},[1554,3249,3175],{"class":1740},[1554,3251,3252],{"class":1556,"line":1613},[1554,3253,2060],{"class":1568},[1554,3255,3256],{"class":1556,"line":1634},[1554,3257,1638],{"emptyLinePlaceholder":1637},[1554,3259,3260,3262,3264,3266,3268,3271,3274,3276,3278,3280,3282,3284,3287,3289],{"class":1556,"line":1641},[1554,3261,2939],{"class":1564},[1554,3263,2035],{"class":1568},[1554,3265,2038],{"class":2016},[1554,3267,2042],{"class":1564},[1554,3269,3270],{"class":2016},"introduce",[1554,3272,3273],{"class":1564},"([",[1554,3275,1586],{"class":1568},[1554,3277,1583],{"class":1582},[1554,3279,1586],{"class":1568},[1554,3281,1767],{"class":1568},[1554,3283,1608],{"class":1607},[1554,3285,3286],{"class":1564},"]))",[1554,3288,1959],{"class":1568},[1554,3290,3291],{"class":1740}," 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