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42",[1593,1856,1857],{"class":1603},")",[1593,1859,1721],{"class":1599},[1593,1861,1863],{"class":1595,"line":1862},17,[1593,1864,1865],{"class":1599},"}\n",[1593,1867,1869,1871,1873],{"class":1595,"line":1868},18,[1593,1870,1642],{"class":1599},[1593,1872,1670],{"class":1603},[1593,1874,1607],{"class":1599},[1530,1876,1877],{},"这段代码中：",[1544,1879,1880,1893,1901],{},[1547,1881,1882,1884,1885,1888,1889,1892],{},[1575,1883,1577],{}," 接收一个类型对象，自动推断 props 类型，",[1575,1886,1887],{},"label"," 是必需字符串，",[1575,1890,1891],{},"count"," 是可选数字。",[1547,1894,1895,1897,1898,1900],{},[1575,1896,1581],{}," 声明了一个事件 ",[1575,1899,1784],{},"，该事件携带一个数字参数。",[1547,1902,1903],{},"在模板和逻辑中都能获得完整的类型提示。",[1530,1905,1906,1907,1578,1910,1913],{},"这相较于 Vue 2 用 ",[1575,1908,1909],{},"PropType",[1575,1911,1912],{},"$emit"," 的写法，更简洁且类型更精准。",[1560,1915,1916],{},[1530,1917,1918,1919,1578,1921,1923,1924,1927],{},"使用 ",[1575,1920,1577],{},[1575,1922,1581],{}," 时，确保 ",[1575,1925,1926],{},"lang=\"ts\""," ，否则类型推断无法生效。",[1534,1929],{},[1525,1931,1933],{"id":1932},"在-composable-函数中使用-ts","🧑‍🔧 在 composable 函数中使用 TS",[1530,1935,1936],{},"composable 函数是 Vue 3 组合式 API 的核心，封装业务逻辑后复用。利用 TypeScript 可以对输入参数和返回值做类型约束，使得调用更加安全。",[1530,1938,1939],{},"示例：一个计数器 composable",[1584,1941,1944],{"className":1942,"code":1943,"language":1683,"meta":1589,"style":1589},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { ref } from 'vue';\n\nexport function useCounter(initialValue = 0) {\n    const count = ref\u003Cnumber>(initialValue);\n\n    function increment(amount: number = 1) {\n        count.value += amount;\n    }\n\n    return { count, increment };\n}\n",[1575,1945,1946,1972,1976,2002,2029,2033,2059,2078,2083,2087,2103],{"__ignoreMap":1589},[1593,1947,1948,1952,1955,1958,1961,1964,1966,1968,1970],{"class":1595,"line":1596},[1593,1949,1951],{"class":1950},"s8pZq","import",[1593,1953,1954],{"class":1599}," {",[1593,1956,1957],{"class":1638}," ref",[1593,1959,1960],{"class":1599}," }",[1593,1962,1963],{"class":1950}," from",[1593,1965,1781],{"class":1599},[1593,1967,1588],{"class":1629},[1593,1969,1787],{"class":1599},[1593,1971,1721],{"class":1599},[1593,1973,1974],{"class":1595,"line":1610},[1593,1975,1662],{"emptyLinePlaceholder":1661},[1593,1977,1978,1981,1984,1987,1989,1992,1995,1998,2000],{"class":1595,"line":1649},[1593,1979,1980],{"class":1950},"export",[1593,1982,1983],{"class":1619}," function",[1593,1985,1986],{"class":1701}," useCounter",[1593,1988,1842],{"class":1599},[1593,1990,1991],{"class":1775},"initialValue",[1593,1993,1994],{"class":1599}," =",[1593,1996,1997],{"class":1853}," 0",[1593,1999,1857],{"class":1599},[1593,2001,1833],{"class":1599},[1593,2003,2004,2007,2010,2012,2014,2016,2019,2021,2023,2025,2027],{"class":1595,"line":1658},[1593,2005,2006],{"class":1619},"    const",[1593,2008,2009],{"class":1638}," count",[1593,2011,1994],{"class":1599},[1593,2013,1957],{"class":1701},[1593,2015,1600],{"class":1599},[1593,2017,2018],{"class":1717},"number",[1593,2020,1635],{"class":1599},[1593,2022,1842],{"class":1603},[1593,2024,1991],{"class":1638},[1593,2026,1857],{"class":1603},[1593,2028,1721],{"class":1599},[1593,2030,2031],{"class":1595,"line":1665},[1593,2032,1662],{"emptyLinePlaceholder":1661},[1593,2034,2035,2038,2041,2043,2046,2048,2050,2052,2055,2057],{"class":1595,"line":1690},[1593,2036,2037],{"class":1619},"    function",[1593,2039,2040],{"class":1701}," increment",[1593,2042,1842],{"class":1599},[1593,2044,2045],{"class":1775},"amount",[1593,2047,1714],{"class":1599},[1593,2049,1733],{"class":1717},[1593,2051,1994],{"class":1599},[1593,2053,2054],{"class":1853}," 1",[1593,2056,1857],{"class":1599},[1593,2058,1833],{"class":1599},[1593,2060,2061,2064,2067,2070,2073,2076],{"class":1595,"line":1708},[1593,2062,2063],{"class":1638},"        count",[1593,2065,2066],{"class":1599},".",[1593,2068,2069],{"class":1638},"value",[1593,2071,2072],{"class":1599}," +=",[1593,2074,2075],{"class":1638}," amount",[1593,2077,1721],{"class":1599},[1593,2079,2080],{"class":1595,"line":1724},[1593,2081,2082],{"class":1599},"    }\n",[1593,2084,2085],{"class":1595,"line":1738},[1593,2086,1662],{"emptyLinePlaceholder":1661},[1593,2088,2089,2092,2094,2096,2098,2100],{"class":1595,"line":1749},[1593,2090,2091],{"class":1950},"    return",[1593,2093,1954],{"class":1599},[1593,2095,2009],{"class":1638},[1593,2097,1790],{"class":1599},[1593,2099,2040],{"class":1638},[1593,2101,2102],{"class":1599}," };\n",[1593,2104,2105],{"class":1595,"line":1754},[1593,2106,1865],{"class":1599},[1530,2108,2109],{},"使用时：",[1584,2111,2113],{"className":1942,"code":2112,"language":1683,"meta":1589,"style":1589},"import { useCounter } from './useCounter';\n\nconst { count, increment } = useCounter(10);\nincrement(5);\n// count.value 类型是 number，编辑器可自动提示\n",[1575,2114,2115,2136,2140,2169,2183],{"__ignoreMap":1589},[1593,2116,2117,2119,2121,2123,2125,2127,2129,2132,2134],{"class":1595,"line":1596},[1593,2118,1951],{"class":1950},[1593,2120,1954],{"class":1599},[1593,2122,1986],{"class":1638},[1593,2124,1960],{"class":1599},[1593,2126,1963],{"class":1950},[1593,2128,1781],{"class":1599},[1593,2130,2131],{"class":1629},"./useCounter",[1593,2133,1787],{"class":1599},[1593,2135,1721],{"class":1599},[1593,2137,2138],{"class":1595,"line":1610},[1593,2139,1662],{"emptyLinePlaceholder":1661},[1593,2141,2142,2144,2146,2148,2150,2153,2156,2158,2160,2162,2165,2167],{"class":1595,"line":1649},[1593,2143,1693],{"class":1619},[1593,2145,1954],{"class":1599},[1593,2147,2009],{"class":1638},[1593,2149,1790],{"class":1599},[1593,2151,2152],{"class":1638}," increment ",[1593,2154,2155],{"class":1599},"}",[1593,2157,1994],{"class":1599},[1593,2159,1986],{"class":1701},[1593,2161,1842],{"class":1638},[1593,2163,2164],{"class":1853},"10",[1593,2166,1857],{"class":1638},[1593,2168,1721],{"class":1599},[1593,2170,2171,2174,2176,2179,2181],{"class":1595,"line":1658},[1593,2172,2173],{"class":1701},"increment",[1593,2175,1842],{"class":1638},[1593,2177,2178],{"class":1853},"5",[1593,2180,1857],{"class":1638},[1593,2182,1721],{"class":1599},[1593,2184,2185],{"class":1595,"line":1665},[1593,2186,2188],{"class":2187},"syuKq","// count.value 类型是 number，编辑器可自动提示\n",[1530,2190,2191],{},"上面例子中：",[1544,2193,2194,2201,2204],{},[1547,2195,2196,2197,2200],{},"使用泛型给 ",[1575,2198,2199],{},"ref"," 明确类型。",[1547,2202,2203],{},"函数参数和返回值都有类型定义。",[1547,2205,2206],{},"调用时享受类型检查和自动提示。",[1560,2208,2209],{},[1530,2210,2211],{},"给 composable 函数的参数和返回值写类型声明，能极大提升代码健壮性，避免运行时错误。",[1534,2213],{},[1525,2215,2217],{"id":2216},"小节总结","🧾 小节总结",[1544,2219,2220,2223,2231,2234],{},[1547,2221,2222],{},"Vue 3 从设计上增强了 TypeScript 支持，使用 Composition API 时类型推断效果极佳。",[1547,2224,2225,2226,1578,2228,2230],{},"通过 ",[1575,2227,1577],{},[1575,2229,1581],{}," 可以方便安全地声明组件的 Props 和事件类型。",[1547,2232,2233],{},"在 composable 函数中使用 TypeScript，可以保证参数和返回值的类型安全，提升复用性。",[1547,2235,2236],{},"利用 VSCode 插件和一些 TS 技巧，能大幅提升开发时的类型提示和调试效率。",[1534,2238],{},[1525,2240,2242],{"id":2241},"知识问答qa","❓ 知识问答（Q&A）",[1530,2244,2245],{},"Q：Vue 3 中如何给组件的事件声明类型？",[1530,2247,2248,2249,2251,2252,2255],{},"A：使用 ",[1575,2250,1581],{},"，传入带事件名和参数的类型定义，例如 ",[1575,2253,2254],{},"(e: 'click', id: number) => void","。",[1530,2257,2258,2259,2262,2263,2266],{},"Q：为什么推荐使用 ",[1575,2260,2261],{},"\u003Cscript setup lang=\"ts\">"," 而非普通 ",[1575,2264,2265],{},"\u003Cscript>","？",[1530,2268,2269,2270,2273],{},"A：",[1575,2271,2272],{},"\u003Cscript setup>"," 是编译时语法糖，能自动推断类型、简化代码，配合 TS 带来更好的开发体验。",[1530,2275,2276],{},"Q：composable 函数中如何声明返回值的类型？",[1530,2278,2279,2280,2283],{},"A：给函数返回的对象或变量写上类型注解，比如 ",[1575,2281,2282],{},"const count = ref\u003Cnumber>(0)","，函数本身也可以声明返回类型。",[1534,2285],{},[1525,2287,2289],{"id":2288},"小练习","🧪 小练习",[2291,2292,2294],"h3",{"id":2293},"练习-1","练习 1",[1530,2296,2297,2298,2301],{},"编写一个带有类型定义的计数器组件，支持传入初始值和增加步长，并触发 ",[1575,2299,2300],{},"update"," 事件传递最新值。",[1584,2303,2305],{"className":1586,"code":2304,"language":1588,"meta":1589,"style":1589},"\u003Ctemplate>\n    \u003Cbutton @click=\"increment\">Count: {{ count }}\u003C/button>\n\u003C/template>\n\n\u003Cscript setup lang=\"ts\">\n// 在这里编写代码\n\u003C/script>\n",[1575,2306,2307,2315,2342,2350,2354,2374,2379],{"__ignoreMap":1589},[1593,2308,2309,2311,2313],{"class":1595,"line":1596},[1593,2310,1600],{"class":1599},[1593,2312,1604],{"class":1603},[1593,2314,1607],{"class":1599},[1593,2316,2317,2319,2321,2323,2325,2327,2329,2331,2333,2336,2338,2340],{"class":1595,"line":1610},[1593,2318,1613],{"class":1599},[1593,2320,1616],{"class":1603},[1593,2322,1620],{"class":1619},[1593,2324,1623],{"class":1599},[1593,2326,1626],{"class":1599},[1593,2328,2173],{"class":1629},[1593,2330,1626],{"class":1599},[1593,2332,1635],{"class":1599},[1593,2334,2335],{"class":1638},"Count: {{ count }}",[1593,2337,1642],{"class":1599},[1593,2339,1616],{"class":1603},[1593,2341,1607],{"class":1599},[1593,2343,2344,2346,2348],{"class":1595,"line":1649},[1593,2345,1642],{"class":1599},[1593,2347,1604],{"class":1603},[1593,2349,1607],{"class":1599},[1593,2351,2352],{"class":1595,"line":1658},[1593,2353,1662],{"emptyLinePlaceholder":1661},[1593,2355,2356,2358,2360,2362,2364,2366,2368,2370,2372],{"class":1595,"line":1665},[1593,2357,1600],{"class":1599},[1593,2359,1670],{"class":1603},[1593,2361,1673],{"class":1619},[1593,2363,1676],{"class":1619},[1593,2365,1623],{"class":1599},[1593,2367,1626],{"class":1599},[1593,2369,1683],{"class":1629},[1593,2371,1626],{"class":1599},[1593,2373,1607],{"class":1599},[1593,2375,2376],{"class":1595,"line":1690},[1593,2377,2378],{"class":2187},"// 在这里编写代码\n",[1593,2380,2381,2383,2385],{"class":1595,"line":1708},[1593,2382,1642],{"class":1599},[1593,2384,1670],{"class":1603},[1593,2386,1607],{"class":1599},[2291,2388,2390],{"id":2389},"练习-2","练习 2",[1530,2392,2393,2394,2397],{},"实现一个 composable 函数 ",[1575,2395,2396],{},"useToggle","，接收初始布尔值，返回当前状态和切换函数。",[1584,2399,2400],{"className":1942,"code":2378,"language":1683,"meta":1589,"style":1589},[1575,2401,2402],{"__ignoreMap":1589},[1593,2403,2404],{"class":1595,"line":1596},[1593,2405,2378],{"class":2187},[1534,2407],{},[1530,2409,2410],{},"🎉 恭喜你已经掌握 Vue3 中 TypeScript 的组件类型推断、composable 函数使用，以及类型提示和调试优化技巧啦！继续实践，写出更高质量的前端代码！",[2412,2413,2414],"style",{},"html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sK9QF, html code.shiki .sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}",{"title":1589,"searchDepth":1610,"depth":1610,"links":2416},[2417,2418,2419,2420,2421,2422,2423],{"id":1527,"depth":1610,"text":1528},{"id":1538,"depth":1610,"text":1539},{"id":1569,"depth":1610,"text":1570},{"id":1932,"depth":1610,"text":1933},{"id":2216,"depth":1610,"text":2217},{"id":2241,"depth":1610,"text":2242},{"id":2288,"depth":1610,"text":2289,"children":2424},[2425,2426],{"id":2293,"depth":1649,"text":2294},{"id":2389,"depth":1649,"text":2390},"本文全面介绍 Vue3 中 TypeScript 的支持，包括组件中 Props 和 Emit 的类型推断、composable 函数中的 TS 使用，以及类型提示和调试优化技巧。","md",null,{},{"title":689},{"title":689,"description":2427},"7b0bTBbedD",[2435,2437],{"title":685,"path":686,"stem":687,"description":2436,"children":-1},"这篇文章详细介绍了 Vue3 模板语法的新特性和变化，帮助初学者快速掌握 Vue3 组件开发的核心知识。",{"title":693,"path":694,"stem":695,"description":2438,"children":-1},"深入理解 Vue3 响应式系统原理，掌握 ref、reactive 的本质区别，以及 toRefs、toRaw、readonly 等常用进阶 API 的使用。",1784715109341]