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感知不到\n",[1531,1784,1785,1786,1591,1788,1791,1792,1795,1796,1798],{},"基本类型的值直接存在变量里，JavaScript 没有任何机制能在「读变量」「改变量」时插入代码，所以光靠 ",[1535,1787,1548],{},[1535,1789,1790],{},"count++"," 这种操作 Vue 发现不了。Vue3 的解法很直接：",[1554,1793,1794],{},"拦不住值本身，就把值包进一个对象，改为拦截这个对象上的属性读写","。这个对象带一个 ",[1535,1797,1594],{}," 属性：",[1665,1800,1802],{"className":1667,"code":1801,"language":1669,"meta":1670,"style":1670},"// ref 的本质：一个带 .value 属性的对象\nconst count = ref(0);\ncount.value++; // 读 .value、改 .value，这两步都能被拦截\n",[1535,1803,1804,1809,1829],{"__ignoreMap":1670},[1674,1805,1806],{"class":1676,"line":1677},[1674,1807,1808],{"class":1680},"// ref 的本质：一个带 .value 属性的对象\n",[1674,1810,1811,1813,1815,1817,1820,1822,1825,1827],{"class":1676,"line":1684},[1674,1812,1688],{"class":1687},[1674,1814,1766],{"class":1691},[1674,1816,1696],{"class":1695},[1674,1818,1819],{"class":1699}," ref",[1674,1821,1703],{"class":1691},[1674,1823,1824],{"class":1716},"0",[1674,1826,1723],{"class":1691},[1674,1828,1726],{"class":1695},[1674,1830,1831,1833,1835,1838,1840],{"class":1676,"line":1729},[1674,1832,1738],{"class":1691},[1674,1834,1735],{"class":1695},[1674,1836,1837],{"class":1691},"value",[1674,1839,1741],{"class":1695},[1674,1841,1842],{"class":1680}," // 读 .value、改 .value，这两步都能被拦截\n",[1531,1844,1845,1846,1849,1850,1852,1853,1855],{},"这样一来，「读取 ",[1535,1847,1848],{},"count.value","」和「修改 ",[1535,1851,1848],{},"」都成了对象属性的读写。而属性读写是可以被拦截的，第三篇用 ",[1535,1854,1548],{}," 做到，这一篇你会看到用 class 的 getter/setter 也能做到。包上这层对象之后，响应式那套机制就又能用了。",[1640,1857],{},[1526,1859,1861],{"id":1860},"refimpl-的实现","🧱 RefImpl 的实现",[1531,1863,1864,1865,1868,1869,1871],{},"知道了「包一层对象」的思路，这一节就看 Vue 怎么实现这个对象。",[1535,1866,1867],{},"ref()"," 做的事就是创建它，源码里这个类叫 ",[1535,1870,1601],{},"。下面分两步看教学简化版（去掉了 TypeScript 类型注解和边缘分支，保留核心逻辑）。第一步，创建时把值存进去：",[1665,1873,1875],{"className":1667,"code":1874,"language":1669,"meta":1670,"style":1670},"// 简化自 packages/reactivity/src/ref.ts\nclass RefImpl {\n    constructor(value) {\n        // 传进来的是对象，就交给 reactive 转成响应式对象\n        this._value = isObject(value) ? reactive(value) : value;\n        // 同时保存一份原始值，以后赋值时用来对比新旧\n        this._rawValue = value;\n    }\n}\n",[1535,1876,1877,1882,1894,1908,1913,1952,1957,1970,1976],{"__ignoreMap":1670},[1674,1878,1879],{"class":1676,"line":1677},[1674,1880,1881],{"class":1680},"// 简化自 packages/reactivity/src/ref.ts\n",[1674,1883,1884,1887,1891],{"class":1676,"line":1684},[1674,1885,1886],{"class":1687},"class",[1674,1888,1890],{"class":1889},"sYGMc"," RefImpl",[1674,1892,1893],{"class":1695}," {\n",[1674,1895,1896,1899,1901,1904,1906],{"class":1676,"line":1729},[1674,1897,1898],{"class":1687},"    constructor",[1674,1900,1703],{"class":1695},[1674,1902,1837],{"class":1903},"sK9QF",[1674,1905,1723],{"class":1695},[1674,1907,1893],{"class":1695},[1674,1909,1910],{"class":1676,"line":1747},[1674,1911,1912],{"class":1680},"        // 传进来的是对象，就交给 reactive 转成响应式对象\n",[1674,1914,1915,1918,1921,1924,1927,1929,1931,1934,1937,1939,1941,1943,1945,1947,1950],{"class":1676,"line":1754},[1674,1916,1917],{"class":1695},"        this.",[1674,1919,1920],{"class":1691},"_value",[1674,1922,1923],{"class":1695}," =",[1674,1925,1926],{"class":1699}," isObject",[1674,1928,1703],{"class":1709},[1674,1930,1837],{"class":1691},[1674,1932,1933],{"class":1709},") ",[1674,1935,1936],{"class":1695},"?",[1674,1938,1700],{"class":1699},[1674,1940,1703],{"class":1709},[1674,1942,1837],{"class":1691},[1674,1944,1933],{"class":1709},[1674,1946,1713],{"class":1695},[1674,1948,1949],{"class":1691}," value",[1674,1951,1726],{"class":1695},[1674,1953,1954],{"class":1676,"line":1760},[1674,1955,1956],{"class":1680},"        // 同时保存一份原始值，以后赋值时用来对比新旧\n",[1674,1958,1959,1961,1964,1966,1968],{"class":1676,"line":1775},[1674,1960,1917],{"class":1695},[1674,1962,1963],{"class":1691},"_rawValue",[1674,1965,1923],{"class":1695},[1674,1967,1949],{"class":1691},[1674,1969,1726],{"class":1695},[1674,1971,1973],{"class":1676,"line":1972},8,[1674,1974,1975],{"class":1695},"    }\n",[1674,1977,1979],{"class":1676,"line":1978},9,[1674,1980,1981],{"class":1695},"}\n",[1531,1983,1984,1985,1987,1988,1990,1991,1994,1995,1990,1997,2000],{},"第二步，拦截 ",[1535,1986,1594],{}," 的读写。这里用了 class 的访问器（getter/setter）：它的作用是，读 ",[1535,1989,1594],{}," 时自动执行 ",[1535,1992,1993],{},"get value()","，写 ",[1535,1996,1594],{},[1535,1998,1999],{},"set value()","，Vue 就把拦截代码写在这两个函数里：",[1665,2002,2004],{"className":1667,"code":2003,"language":1669,"meta":1670,"style":1670},"get value() {\n    // 收集依赖：把当前正在执行的 effect 登记到这个 ref 名下\n    trackRefValue(this);\n    return this._value;\n}\n\nset value(newVal) {\n    // hasChanged 内部用 Object.is 对比新旧值，没变就直接结束\n    if (hasChanged(newVal, this._rawValue)) {\n        this._rawValue = newVal;\n        // 新值是对象的话，同样转成响应式\n        this._value = isObject(newVal) ? reactive(newVal) : newVal;\n        // 触发更新：通知登记过的所有 effect 重新执行\n        triggerRefValue(this);\n    }\n}\n",[1535,2005,2006,2019,2024,2038,2051,2055,2059,2071,2076,2104,2118,2124,2157,2163,2177,2182],{"__ignoreMap":1670},[1674,2007,2008,2011,2013,2016],{"class":1676,"line":1677},[1674,2009,2010],{"class":1691},"get ",[1674,2012,1837],{"class":1699},[1674,2014,2015],{"class":1691},"() ",[1674,2017,2018],{"class":1695},"{\n",[1674,2020,2021],{"class":1676,"line":1684},[1674,2022,2023],{"class":1680},"    // 收集依赖：把当前正在执行的 effect 登记到这个 ref 名下\n",[1674,2025,2026,2029,2031,2034,2036],{"class":1676,"line":1729},[1674,2027,2028],{"class":1699},"    trackRefValue",[1674,2030,1703],{"class":1709},[1674,2032,2033],{"class":1695},"this",[1674,2035,1723],{"class":1709},[1674,2037,1726],{"class":1695},[1674,2039,2040,2044,2047,2049],{"class":1676,"line":1747},[1674,2041,2043],{"class":2042},"s8pZq","    return",[1674,2045,2046],{"class":1695}," this.",[1674,2048,1920],{"class":1691},[1674,2050,1726],{"class":1695},[1674,2052,2053],{"class":1676,"line":1754},[1674,2054,1981],{"class":1695},[1674,2056,2057],{"class":1676,"line":1760},[1674,2058,1751],{"emptyLinePlaceholder":1750},[1674,2060,2061,2064,2066,2069],{"class":1676,"line":1775},[1674,2062,2063],{"class":1691},"set ",[1674,2065,1837],{"class":1699},[1674,2067,2068],{"class":1691},"(newVal) ",[1674,2070,2018],{"class":1695},[1674,2072,2073],{"class":1676,"line":1972},[1674,2074,2075],{"class":1680},"    // hasChanged 内部用 Object.is 对比新旧值，没变就直接结束\n",[1674,2077,2078,2081,2084,2087,2089,2092,2095,2097,2099,2102],{"class":1676,"line":1978},[1674,2079,2080],{"class":2042},"    if",[1674,2082,2083],{"class":1709}," (",[1674,2085,2086],{"class":1699},"hasChanged",[1674,2088,1703],{"class":1709},[1674,2090,2091],{"class":1691},"newVal",[1674,2093,2094],{"class":1695},",",[1674,2096,2046],{"class":1695},[1674,2098,1963],{"class":1691},[1674,2100,2101],{"class":1709},")) ",[1674,2103,2018],{"class":1695},[1674,2105,2107,2109,2111,2113,2116],{"class":1676,"line":2106},10,[1674,2108,1917],{"class":1695},[1674,2110,1963],{"class":1691},[1674,2112,1923],{"class":1695},[1674,2114,2115],{"class":1691}," newVal",[1674,2117,1726],{"class":1695},[1674,2119,2121],{"class":1676,"line":2120},11,[1674,2122,2123],{"class":1680},"        // 新值是对象的话，同样转成响应式\n",[1674,2125,2127,2129,2131,2133,2135,2137,2139,2141,2143,2145,2147,2149,2151,2153,2155],{"class":1676,"line":2126},12,[1674,2128,1917],{"class":1695},[1674,2130,1920],{"class":1691},[1674,2132,1923],{"class":1695},[1674,2134,1926],{"class":1699},[1674,2136,1703],{"class":1709},[1674,2138,2091],{"class":1691},[1674,2140,1933],{"class":1709},[1674,2142,1936],{"class":1695},[1674,2144,1700],{"class":1699},[1674,2146,1703],{"class":1709},[1674,2148,2091],{"class":1691},[1674,2150,1933],{"class":1709},[1674,2152,1713],{"class":1695},[1674,2154,2115],{"class":1691},[1674,2156,1726],{"class":1695},[1674,2158,2160],{"class":1676,"line":2159},13,[1674,2161,2162],{"class":1680},"        // 触发更新：通知登记过的所有 effect 重新执行\n",[1674,2164,2166,2169,2171,2173,2175],{"class":1676,"line":2165},14,[1674,2167,2168],{"class":1699},"        triggerRefValue",[1674,2170,1703],{"class":1709},[1674,2172,2033],{"class":1695},[1674,2174,1723],{"class":1709},[1674,2176,1726],{"class":1695},[1674,2178,2180],{"class":1676,"line":2179},15,[1674,2181,1975],{"class":1695},[1674,2183,2185],{"class":1676,"line":2184},16,[1674,2186,1981],{"class":1695},[1531,2188,2189,2190,2193,2194,2196,2197,2200,2201,2204,2205,2207,2208,2211,2212,2214],{},"这里的 ",[1535,2191,2192],{},"trackRefValue"," 就是第四篇讲过的依赖收集，逻辑和 ",[1535,2195,1537],{}," 的 ",[1535,2198,2199],{},"track"," 是同一套。「依赖」这个词不用怕，它就是「用到了这个数据的 effect 函数」，先登记下来，数据变了才知道该通知谁。",[1535,2202,2203],{},"triggerRefValue"," 则是反方向的动作：挨个通知登记过的 effect。而 ",[1535,2206,1867],{}," 本身只是一行包装：把值 ",[1535,2209,2210],{},"new"," 成一个 ",[1535,2213,1601],{}," 实例返回。另外有两点值得记住：",[1583,2216,2217,2225],{},[1586,2218,2219,1542,2222,2224],{},[1554,2220,2221],{},"赋同一个值不会触发更新",[1535,2223,2086],{}," 先挡一道，这是一个简单实用的优化。",[1586,2226,2227,2233,2234,2237,2238,2241,2242,2244],{},[1554,2228,2229,2230,2232],{},"传入对象会被 ",[1535,2231,1537],{}," 转换","：所以 ",[1535,2235,2236],{},"ref({ name: 'noxussj' })"," 之后，改 ",[1535,2239,2240],{},"userRef.value.name"," 也能触发更新，靠的是对象那套 ",[1535,2243,1548],{}," 拦截。",[2246,2247,2248],"tip",{},[1531,2249,2250,2251,2253],{},"为什么用 getter/setter 而不是再包一层 ",[1535,2252,1548],{},"？因为只需拦截一个固定属性，getter/setter 更直接、开销更小。了解即可，不影响理解主线。",[1640,2255],{},[1526,2257,2259],{"id":2258},"ref-在-reactive-中的自动解包","🧱 ref 在 reactive 中的自动解包",[1531,2261,2262,2263,2265,2266,2268,2269,2271,2272,2275,2276,2278],{},"这一节解释一个你天天在用、但可能没注意过的「自动」行为：当 ",[1535,2264,1574],{}," 作为 ",[1535,2267,1537],{}," 对象的属性时，访问它会自动取出 ",[1535,2270,1594],{},"，这叫",[1554,2273,2274],{},"自动解包","，就是 Vue 帮你省掉了写 ",[1535,2277,1594],{}," 这一步：",[1665,2280,2282],{"className":1667,"code":2281,"language":1669,"meta":1670,"style":1670},"const count = ref(0);\nconst state = reactive({ count });\n\nconsole.log(state.count); // 0，不用写 state.count.value\nstate.count = 1; // 等价于 count.value = 1\n",[1535,2283,2284,2302,2325,2329,2353],{"__ignoreMap":1670},[1674,2285,2286,2288,2290,2292,2294,2296,2298,2300],{"class":1676,"line":1677},[1674,2287,1688],{"class":1687},[1674,2289,1766],{"class":1691},[1674,2291,1696],{"class":1695},[1674,2293,1819],{"class":1699},[1674,2295,1703],{"class":1691},[1674,2297,1824],{"class":1716},[1674,2299,1723],{"class":1691},[1674,2301,1726],{"class":1695},[1674,2303,2304,2306,2308,2310,2312,2314,2316,2318,2321,2323],{"class":1676,"line":1684},[1674,2305,1688],{"class":1687},[1674,2307,1692],{"class":1691},[1674,2309,1696],{"class":1695},[1674,2311,1700],{"class":1699},[1674,2313,1703],{"class":1691},[1674,2315,1706],{"class":1695},[1674,2317,1766],{"class":1691},[1674,2319,2320],{"class":1695},"}",[1674,2322,1723],{"class":1691},[1674,2324,1726],{"class":1695},[1674,2326,2327],{"class":1676,"line":1729},[1674,2328,1751],{"emptyLinePlaceholder":1750},[1674,2330,2331,2334,2336,2339,2342,2344,2347,2350],{"class":1676,"line":1747},[1674,2332,2333],{"class":1691},"console",[1674,2335,1735],{"class":1695},[1674,2337,2338],{"class":1699},"log",[1674,2340,2341],{"class":1691},"(state",[1674,2343,1735],{"class":1695},[1674,2345,2346],{"class":1691},"count)",[1674,2348,2349],{"class":1695},";",[1674,2351,2352],{"class":1680}," // 0，不用写 state.count.value\n",[1674,2354,2355,2357,2359,2362,2364,2367,2369],{"class":1676,"line":1754},[1674,2356,1732],{"class":1691},[1674,2358,1735],{"class":1695},[1674,2360,2361],{"class":1691},"count ",[1674,2363,1696],{"class":1695},[1674,2365,2366],{"class":1716}," 1",[1674,2368,2349],{"class":1695},[1674,2370,2371],{"class":1680}," // 等价于 count.value = 1\n",[1531,2373,2374,2375,2196,2377,2380,2381,2383,2384,1591,2386,2389,2390,2392,2393,2395,2396,2398,2399,2401],{},"原理一句话：",[1535,2376,1537],{},[1535,2378,2379],{},"get"," 拦截里会检查读到的值是不是 ",[1535,2382,1574],{},"，是的话就顺手返回 ",[1535,2385,1594],{},[1535,2387,2388],{},"set"," 拦截同理。所以模板和 ",[1535,2391,1537],{}," 对象里都能省略 ",[1535,2394,1594],{},"。而在普通 JS 代码里，",[1535,2397,1574],{}," 没有经过任何拦截处理，就必须老老实实写 ",[1535,2400,1594],{},"。",[2403,2404,2405],"warning",{},[1531,2406,2407,2408,2411,2412,2415,2416,2401],{},"例外情况：ref 作为",[1554,2409,2410],{},"数组元素","或原生集合（Map、Set）的元素时不会解包，",[1535,2413,2414],{},"reactive([ref(0)])[0]"," 拿到的还是 ref 本身，要访问 ",[1535,2417,1594],{},[1640,2419],{},[1526,2421,2423],{"id":2422},"computedrefimpl懒计算与缓存","🧱 ComputedRefImpl：懒计算与缓存",[1531,2425,2426,2427,1591,2429,2431,2432,2434],{},"理解了 ",[1535,2428,1574],{},[1535,2430,1580],{}," 就是顺水推舟的事。这一节回答一个常见疑问：",[1535,2433,1580],{}," 为什么比模板里的普通方法「省」？",[1531,2436,2437,2438,2440,2441,2444],{},"先用大白话说 ",[1535,2439,1580],{}," 是什么：它包着一个计算函数，",[1554,2442,2443],{},"没人用的时候不执行，执行过一次就把结果存起来，只要用到的数据没变，之后直接返回存好的结果，不再重复执行","。这里说的「缓存」，就是把算过的结果存起来，下次直接用。",[1531,2446,2447,2448,2450,2451,2454,2455,2458,2459,2462,2463,2465,2466,2468],{},"源码里 ",[1535,2449,1580],{}," 返回的也是一个类实例，叫 ",[1535,2452,2453],{},"ComputedRefImpl","。整个机制只靠一个标记：",[1535,2456,2457],{},"_dirty","（脏标记），它是一个布尔值，",[1535,2460,2461],{},"true"," 表示「上次存的结果已经过期，需要重新计算」。创建实例时只把标记置为 ",[1535,2464,2461],{},"，不计算。注意下面把计算函数包进了一个 ",[1535,2467,1541],{},"，它是第四篇讲的「会自动重跑的函数包裹器」，能记住自己用到了哪些响应式数据：",[1665,2470,2472],{"className":1667,"code":2471,"language":1669,"meta":1670,"style":1670},"// 简化自 packages/reactivity/src/computed.ts\nclass ComputedRefImpl {\n    constructor(getter) {\n        this._dirty = true; // 脏标记：true 表示结果过期，需要重算\n        this._value = undefined; // 缓存上次的计算结果\n\n        // 依赖变化时不急着重算，只把脏标记置回 true\n        this.effect = new ReactiveEffect(getter, () => {\n            if (!this._dirty) {\n                this._dirty = true;\n                // 通知「用到了这个 computed 的地方」更新\n                triggerRefValue(this);\n            }\n        });\n    }\n}\n",[1535,2473,2474,2479,2488,2501,2518,2532,2536,2541,2569,2585,2598,2603,2616,2621,2630,2634],{"__ignoreMap":1670},[1674,2475,2476],{"class":1676,"line":1677},[1674,2477,2478],{"class":1680},"// 简化自 packages/reactivity/src/computed.ts\n",[1674,2480,2481,2483,2486],{"class":1676,"line":1684},[1674,2482,1886],{"class":1687},[1674,2484,2485],{"class":1889}," ComputedRefImpl",[1674,2487,1893],{"class":1695},[1674,2489,2490,2492,2494,2497,2499],{"class":1676,"line":1729},[1674,2491,1898],{"class":1687},[1674,2493,1703],{"class":1695},[1674,2495,2496],{"class":1903},"getter",[1674,2498,1723],{"class":1695},[1674,2500,1893],{"class":1695},[1674,2502,2503,2505,2507,2509,2513,2515],{"class":1676,"line":1747},[1674,2504,1917],{"class":1695},[1674,2506,2457],{"class":1691},[1674,2508,1923],{"class":1695},[1674,2510,2512],{"class":2511},"sPKOg"," true",[1674,2514,2349],{"class":1695},[1674,2516,2517],{"class":1680}," // 脏标记：true 表示结果过期，需要重算\n",[1674,2519,2520,2522,2524,2526,2529],{"class":1676,"line":1754},[1674,2521,1917],{"class":1695},[1674,2523,1920],{"class":1691},[1674,2525,1923],{"class":1695},[1674,2527,2528],{"class":1695}," undefined;",[1674,2530,2531],{"class":1680}," // 缓存上次的计算结果\n",[1674,2533,2534],{"class":1676,"line":1760},[1674,2535,1751],{"emptyLinePlaceholder":1750},[1674,2537,2538],{"class":1676,"line":1775},[1674,2539,2540],{"class":1680},"        // 依赖变化时不急着重算，只把脏标记置回 true\n",[1674,2542,2543,2545,2547,2549,2552,2555,2557,2559,2561,2564,2567],{"class":1676,"line":1972},[1674,2544,1917],{"class":1695},[1674,2546,1541],{"class":1691},[1674,2548,1923],{"class":1695},[1674,2550,2551],{"class":1695}," new",[1674,2553,2554],{"class":1699}," ReactiveEffect",[1674,2556,1703],{"class":1709},[1674,2558,2496],{"class":1691},[1674,2560,2094],{"class":1695},[1674,2562,2563],{"class":1695}," ()",[1674,2565,2566],{"class":1687}," =>",[1674,2568,1893],{"class":1695},[1674,2570,2571,2574,2576,2579,2581,2583],{"class":1676,"line":1978},[1674,2572,2573],{"class":2042},"            if",[1674,2575,2083],{"class":1709},[1674,2577,2578],{"class":1695},"!this.",[1674,2580,2457],{"class":1691},[1674,2582,1933],{"class":1709},[1674,2584,2018],{"class":1695},[1674,2586,2587,2590,2592,2594,2596],{"class":1676,"line":2106},[1674,2588,2589],{"class":1695},"                this.",[1674,2591,2457],{"class":1691},[1674,2593,1923],{"class":1695},[1674,2595,2512],{"class":2511},[1674,2597,1726],{"class":1695},[1674,2599,2600],{"class":1676,"line":2120},[1674,2601,2602],{"class":1680},"                // 通知「用到了这个 computed 的地方」更新\n",[1674,2604,2605,2608,2610,2612,2614],{"class":1676,"line":2126},[1674,2606,2607],{"class":1699},"                triggerRefValue",[1674,2609,1703],{"class":1709},[1674,2611,2033],{"class":1695},[1674,2613,1723],{"class":1709},[1674,2615,1726],{"class":1695},[1674,2617,2618],{"class":1676,"line":2159},[1674,2619,2620],{"class":1695},"            }\n",[1674,2622,2623,2626,2628],{"class":1676,"line":2165},[1674,2624,2625],{"class":1695},"        }",[1674,2627,1723],{"class":1709},[1674,2629,1726],{"class":1695},[1674,2631,2632],{"class":1676,"line":2179},[1674,2633,1975],{"class":1695},[1674,2635,2636],{"class":1676,"line":2184},[1674,2637,1981],{"class":1695},[1531,2639,2640,2641,2643,2644,2646],{},"读取 ",[1535,2642,1594],{}," 时：标记为 ",[1535,2645,2461],{}," 才重新计算，否则直接返回缓存：",[1665,2648,2650],{"className":1667,"code":2649,"language":1669,"meta":1670,"style":1670},"get value() {\n    // 和 ref 一样，读取时先登记使用者\n    trackRefValue(this);\n    // 只有脏了才重新执行 getter，否则直接返回缓存\n    if (this._dirty) {\n        this._dirty = false; // 计算完成，清除脏标记\n        this._value = this.effect.run();\n    }\n    return this._value;\n}\n",[1535,2651,2652,2662,2667,2679,2684,2699,2715,2737,2741,2751],{"__ignoreMap":1670},[1674,2653,2654,2656,2658,2660],{"class":1676,"line":1677},[1674,2655,2010],{"class":1691},[1674,2657,1837],{"class":1699},[1674,2659,2015],{"class":1691},[1674,2661,2018],{"class":1695},[1674,2663,2664],{"class":1676,"line":1684},[1674,2665,2666],{"class":1680},"    // 和 ref 一样，读取时先登记使用者\n",[1674,2668,2669,2671,2673,2675,2677],{"class":1676,"line":1729},[1674,2670,2028],{"class":1699},[1674,2672,1703],{"class":1709},[1674,2674,2033],{"class":1695},[1674,2676,1723],{"class":1709},[1674,2678,1726],{"class":1695},[1674,2680,2681],{"class":1676,"line":1747},[1674,2682,2683],{"class":1680},"    // 只有脏了才重新执行 getter，否则直接返回缓存\n",[1674,2685,2686,2688,2690,2693,2695,2697],{"class":1676,"line":1754},[1674,2687,2080],{"class":2042},[1674,2689,2083],{"class":1709},[1674,2691,2692],{"class":1695},"this.",[1674,2694,2457],{"class":1691},[1674,2696,1933],{"class":1709},[1674,2698,2018],{"class":1695},[1674,2700,2701,2703,2705,2707,2710,2712],{"class":1676,"line":1760},[1674,2702,1917],{"class":1695},[1674,2704,2457],{"class":1691},[1674,2706,1923],{"class":1695},[1674,2708,2709],{"class":2511}," false",[1674,2711,2349],{"class":1695},[1674,2713,2714],{"class":1680}," // 计算完成，清除脏标记\n",[1674,2716,2717,2719,2721,2723,2725,2727,2729,2732,2735],{"class":1676,"line":1775},[1674,2718,1917],{"class":1695},[1674,2720,1920],{"class":1691},[1674,2722,1923],{"class":1695},[1674,2724,2046],{"class":1695},[1674,2726,1541],{"class":1691},[1674,2728,1735],{"class":1695},[1674,2730,2731],{"class":1699},"run",[1674,2733,2734],{"class":1709},"()",[1674,2736,1726],{"class":1695},[1674,2738,2739],{"class":1676,"line":1972},[1674,2740,1975],{"class":1695},[1674,2742,2743,2745,2747,2749],{"class":1676,"line":1978},[1674,2744,2043],{"class":2042},[1674,2746,2046],{"class":1695},[1674,2748,1920],{"class":1691},[1674,2750,1726],{"class":1695},[1674,2752,2753],{"class":1676,"line":2106},[1674,2754,1981],{"class":1695},[1531,2756,2757,2760,2761,2764],{},[1535,2758,2759],{},"computed()"," 同样只是一行包装：",[1535,2762,2763],{},"new ComputedRefImpl(getter)"," 返回实例。把「懒」字拆开，就是三条规则：",[1583,2766,2767,2776,2785],{},[1586,2768,2769,2772,2773,2775],{},[1554,2770,2771],{},"创建时不计算","：只有首次读 ",[1535,2774,1594],{}," 才真正执行 getter，这叫懒计算。",[1586,2777,2778,2781,2782,2784],{},[1554,2779,2780],{},"读完就缓存","：结果存进 ",[1535,2783,1920],{},"，之后再读直接返回缓存。",[1586,2786,2787,2790,2791,2793,2794,2796],{},[1554,2788,2789],{},"依赖变了只改标记","：getter 里用到的数据变化时，不急着重算，只把 ",[1535,2792,2457],{}," 置回 ",[1535,2795,2461],{},"，等下次有人读才算。",[1531,2798,2799,2800,2803],{},"用一段代码验证缓存确实生效（保存为 ",[1535,2801,2802],{},".js"," 文件，Node.js v22 直接运行）：",[1665,2805,2808],{"className":1667,"code":2806,"filename":2807,"language":1669,"meta":1670,"style":1670},"let calls = 0;\nconst count = ref(1);\n\n// computed：依赖不变时只算一次\nconst double = computed(() => {\n    calls++;\n    return count.value * 2;\n});\n\ndouble.value; // 首次读取，真正计算，calls = 1\ndouble.value; // 返回缓存，calls 还是 1\ndouble.value; // 返回缓存，calls 还是 1\n","demo.js",[1535,2809,2810,2823,2842,2846,2851,2871,2879,2897,2905,2909,2923,2936],{"__ignoreMap":1670},[1674,2811,2812,2814,2817,2819,2821],{"class":1676,"line":1677},[1674,2813,1763],{"class":1687},[1674,2815,2816],{"class":1691}," calls ",[1674,2818,1696],{"class":1695},[1674,2820,1717],{"class":1716},[1674,2822,1726],{"class":1695},[1674,2824,2825,2827,2829,2831,2833,2835,2838,2840],{"class":1676,"line":1684},[1674,2826,1688],{"class":1687},[1674,2828,1766],{"class":1691},[1674,2830,1696],{"class":1695},[1674,2832,1819],{"class":1699},[1674,2834,1703],{"class":1691},[1674,2836,2837],{"class":1716},"1",[1674,2839,1723],{"class":1691},[1674,2841,1726],{"class":1695},[1674,2843,2844],{"class":1676,"line":1729},[1674,2845,1751],{"emptyLinePlaceholder":1750},[1674,2847,2848],{"class":1676,"line":1747},[1674,2849,2850],{"class":1680},"// computed：依赖不变时只算一次\n",[1674,2852,2853,2855,2858,2860,2863,2865,2867,2869],{"class":1676,"line":1754},[1674,2854,1688],{"class":1687},[1674,2856,2857],{"class":1691}," double ",[1674,2859,1696],{"class":1695},[1674,2861,2862],{"class":1699}," computed",[1674,2864,1703],{"class":1691},[1674,2866,2734],{"class":1695},[1674,2868,2566],{"class":1687},[1674,2870,1893],{"class":1695},[1674,2872,2873,2876],{"class":1676,"line":1760},[1674,2874,2875],{"class":1691},"    calls",[1674,2877,2878],{"class":1695},"++;\n",[1674,2880,2881,2883,2885,2887,2889,2892,2895],{"class":1676,"line":1775},[1674,2882,2043],{"class":2042},[1674,2884,1710],{"class":1691},[1674,2886,1735],{"class":1695},[1674,2888,1837],{"class":1691},[1674,2890,2891],{"class":1695}," *",[1674,2893,2894],{"class":1716}," 2",[1674,2896,1726],{"class":1695},[1674,2898,2899,2901,2903],{"class":1676,"line":1972},[1674,2900,2320],{"class":1695},[1674,2902,1723],{"class":1691},[1674,2904,1726],{"class":1695},[1674,2906,2907],{"class":1676,"line":1978},[1674,2908,1751],{"emptyLinePlaceholder":1750},[1674,2910,2911,2914,2916,2918,2920],{"class":1676,"line":2106},[1674,2912,2913],{"class":1691},"double",[1674,2915,1735],{"class":1695},[1674,2917,1837],{"class":1691},[1674,2919,2349],{"class":1695},[1674,2921,2922],{"class":1680}," // 首次读取，真正计算，calls = 1\n",[1674,2924,2925,2927,2929,2931,2933],{"class":1676,"line":2120},[1674,2926,2913],{"class":1691},[1674,2928,1735],{"class":1695},[1674,2930,1837],{"class":1691},[1674,2932,2349],{"class":1695},[1674,2934,2935],{"class":1680}," // 返回缓存，calls 还是 1\n",[1674,2937,2938,2940,2942,2944,2946],{"class":1676,"line":2126},[1674,2939,2913],{"class":1691},[1674,2941,1735],{"class":1695},[1674,2943,1837],{"class":1691},[1674,2945,2349],{"class":1695},[1674,2947,2935],{"class":1680},[1531,2949,2950,2951,2954],{},"连续读三次只算了一次。换成普通方法 ",[1535,2952,2953],{},"getDouble()","，调三次就执行三次。计算量大、读取频繁的时候，这个差距就很可观了。",[1640,2956],{},[1526,2958,2960],{"id":2959},"与-vue2-computed-对比","⚡ 与 Vue2 computed 对比",[1531,2962,2963,2964,2968,2969,2972,2973,2976,2977,2980,2981,2976,2984,2986,2987,2989,2990,2993],{},"如果你读过 ",[2965,2966,2967],"a",{"href":1386},"Vue2 源码课程"," 的 computed 篇，会发现",[1554,2970,2971],{},"思想完全一样","：都是「脏标记 + 缓存 + 惰性求值」（惰性求值和前面说的懒计算是同一个意思：用到的时候才计算）。变化的只是实现工具：Vue2 用 ",[1535,2974,2975],{},"Watcher"," 加 ",[1535,2978,2979],{},"dirty"," 标记，Vue3 换成 ",[1535,2982,2983],{},"ReactiveEffect",[1535,2985,2457],{}," 标记，依赖收集和触发更新复用了响应式统一的 ",[1535,2988,2199],{}," / ",[1535,2991,2992],{},"trigger"," 机制。学过一个，另一个很容易看懂。",[1640,2995],{},[1526,2997,2999],{"id":2998},"小节总结","🧾 小节总结",[1583,3001,3002,3016,3030,3041,3048],{},[1586,3003,3004,3006,3007,3009,3010,3012,3013,3015],{},[1535,3005,1548],{}," 无法拦截基本类型，",[1535,3008,1574],{}," 的解法是包一层对象：把值装进带 ",[1535,3011,1594],{}," 的对象，拦截 ",[1535,3014,1594],{}," 的读写。",[1586,3017,3018,3020,3021,3023,3024,3026,3027,3029],{},[1535,3019,1601],{}," 用 class 的 getter/setter 实现：读取时 ",[1535,3022,2192],{}," 登记使用者，赋值时经 ",[1535,3025,2086],{}," 判断后 ",[1535,3028,2203],{}," 通知更新。",[1586,3031,3032,3034,3035,3037,3038,3040],{},[1535,3033,1574],{}," 传入对象时内部会被 ",[1535,3036,1537],{}," 转换，所以改 ",[1535,3039,2240],{}," 也能触发更新。",[1586,3042,3043,2265,3045,3047],{},[1535,3044,1574],{},[1535,3046,1537],{}," 对象的属性会自动解包，但作为数组或原生集合的元素时不解包。",[1586,3049,3050,3052,3053,3055],{},[1535,3051,1580],{}," 的核心是 ",[1535,3054,2457],{}," 脏标记：创建时不算，首次读取才算并缓存，依赖变了只改标记，下次读取才重算。",[1640,3057],{},[1526,3059,3061],{"id":3060},"知识问答","❓ 知识问答",[1531,3063,3064],{},[1554,3065,3066],{},"Q1：为什么模板里的 ref 不用写 .value？",[1531,3068,3069,3070,3072,3073,2265,3075,3077,3078,2401],{},"A：模板编译后的渲染代码访问顶层 ref 时会自动解包（取 ",[1535,3071,1594],{},"），",[1535,3074,1574],{},[1535,3076,1537],{}," 对象的属性时同理。但在普通 JS 代码里没有这层处理，必须自己写 ",[1535,3079,1594],{},[1531,3081,3082],{},[1554,3083,3084],{},"Q2：解构 ref 为什么会丢响应式？",[1531,3086,3087,3088,3091,3092,3094,3095,3098,3099,3102],{},"A：",[1535,3089,3090],{},"const { value } = countRef"," 是把解构那一刻 ",[1535,3093,1594],{}," 的当前值复制成一个普通变量，之后它和 ref 再无关系。想解构又保留响应式，用 ",[1535,3096,3097],{},"toRefs"," 或 ",[1535,3100,3101],{},"toRef","，它们返回的是保持连接的 ref 对象。",[1531,3104,3105],{},[1554,3106,3107],{},"Q3：computed 为什么有缓存，普通方法没有？",[1531,3109,3087,3110,3112,3113,3115,3116,3118,3119,3121],{},[1535,3111,1580],{}," 内部有 ",[1535,3114,2457],{}," 标记和 ",[1535,3117,1920],{}," 缓存，依赖没变就直接返回上次的结果；普通方法每次调用都是一次全新的执行。所以派生数据适合用 ",[1535,3120,1580],{},"，需要传参或每次都必须重新执行的场景用方法。",[1531,3123,3124],{},[1554,3125,3126],{},"Q4：computed 里能修改它的 value 吗？",[1531,3128,3129,3130,3132,3133,3135,3136,3139],{},"A：默认不能，只读的 ",[1535,3131,1580],{}," 没有 ",[1535,3134,1999],{},"，强行赋值在开发环境会收到警告。确实需要时可以用 ",[1535,3137,3138],{},"computed({ get, set })"," 的可写形式，日常开发中用得很少。",[1531,3141,3142],{},[1554,3143,3144],{},"Q5：ref 和 reactive 平时该怎么选？",[1531,3146,3147,3148,3150,3151,3153,3154,3156,3157,3160],{},"A：基本类型只能用 ",[1535,3149,1574],{},"；对象两者都可以。团队里常见的约定是统一用 ",[1535,3152,1574],{},"，心智负担小（访问都带 ",[1535,3155,1594],{},"），也方便在函数间传递而不丢响应式。详细区别可回顾 ",[2965,3158,3159],{"href":671},"Vue3 使用课程"," 的响应式章节。",[1640,3162],{},[1526,3164,3166],{"id":3165},"小练习","🧪 小练习",[1531,3168,3169,3170,3173,3174,3176,3177,3179,3180,3182],{},"不查资料，补全下面的 ",[1535,3171,3172],{},"MyRef"," 类，实现一个迷你 ref：读取 ",[1535,3175,1594],{}," 时打印「收集了依赖」，修改 ",[1535,3178,1594],{}," 且值确实变化时打印「触发了更新」，赋相同的值则不打印。用 Node.js v22 保存为 ",[1535,3181,2802],{}," 文件直接运行验证。",[1665,3184,3186],{"className":1667,"code":3185,"language":1669,"meta":1670,"style":1670},"class MyRef {\n    constructor(value) {\n        this._value = value;\n    }\n\n    get value() {\n        // 请在这里编写代码：打印「收集了依赖」，然后返回 this._value\n    }\n\n    set value(newVal) {\n        // 请在这里编写代码：新旧值不同才更新 _value 并打印「触发了更新」\n    }\n}\n\nconst count = new MyRef(0);\n\n// 期望输出：\n// 收集了依赖\n// 触发了更新\n// 收集了依赖\nconsole.log(count.value);\ncount.value = 1;\ncount.value = 1; // 值没变，这一行不应有任何打印\nconsole.log(count.value);\n",[1535,3187,3188,3197,3209,3221,3225,3229,3240,3245,3249,3253,3268,3273,3277,3281,3285,3305,3309,3315,3321,3327,3332,3351,3367,3385],{"__ignoreMap":1670},[1674,3189,3190,3192,3195],{"class":1676,"line":1677},[1674,3191,1886],{"class":1687},[1674,3193,3194],{"class":1889}," MyRef",[1674,3196,1893],{"class":1695},[1674,3198,3199,3201,3203,3205,3207],{"class":1676,"line":1684},[1674,3200,1898],{"class":1687},[1674,3202,1703],{"class":1695},[1674,3204,1837],{"class":1903},[1674,3206,1723],{"class":1695},[1674,3208,1893],{"class":1695},[1674,3210,3211,3213,3215,3217,3219],{"class":1676,"line":1729},[1674,3212,1917],{"class":1695},[1674,3214,1920],{"class":1691},[1674,3216,1923],{"class":1695},[1674,3218,1949],{"class":1691},[1674,3220,1726],{"class":1695},[1674,3222,3223],{"class":1676,"line":1747},[1674,3224,1975],{"class":1695},[1674,3226,3227],{"class":1676,"line":1754},[1674,3228,1751],{"emptyLinePlaceholder":1750},[1674,3230,3231,3234,3236,3238],{"class":1676,"line":1760},[1674,3232,3233],{"class":1687},"    get",[1674,3235,1949],{"class":1709},[1674,3237,2734],{"class":1695},[1674,3239,1893],{"class":1695},[1674,3241,3242],{"class":1676,"line":1775},[1674,3243,3244],{"class":1680},"        // 请在这里编写代码：打印「收集了依赖」，然后返回 this._value\n",[1674,3246,3247],{"class":1676,"line":1972},[1674,3248,1975],{"class":1695},[1674,3250,3251],{"class":1676,"line":1978},[1674,3252,1751],{"emptyLinePlaceholder":1750},[1674,3254,3255,3258,3260,3262,3264,3266],{"class":1676,"line":2106},[1674,3256,3257],{"class":1687},"    set",[1674,3259,1949],{"class":1709},[1674,3261,1703],{"class":1695},[1674,3263,2091],{"class":1903},[1674,3265,1723],{"class":1695},[1674,3267,1893],{"class":1695},[1674,3269,3270],{"class":1676,"line":2120},[1674,3271,3272],{"class":1680},"        // 请在这里编写代码：新旧值不同才更新 _value 并打印「触发了更新」\n",[1674,3274,3275],{"class":1676,"line":2126},[1674,3276,1975],{"class":1695},[1674,3278,3279],{"class":1676,"line":2159},[1674,3280,1981],{"class":1695},[1674,3282,3283],{"class":1676,"line":2165},[1674,3284,1751],{"emptyLinePlaceholder":1750},[1674,3286,3287,3289,3291,3293,3295,3297,3299,3301,3303],{"class":1676,"line":2179},[1674,3288,1688],{"class":1687},[1674,3290,1766],{"class":1691},[1674,3292,1696],{"class":1695},[1674,3294,2551],{"class":1695},[1674,3296,3194],{"class":1699},[1674,3298,1703],{"class":1691},[1674,3300,1824],{"class":1716},[1674,3302,1723],{"class":1691},[1674,3304,1726],{"class":1695},[1674,3306,3307],{"class":1676,"line":2184},[1674,3308,1751],{"emptyLinePlaceholder":1750},[1674,3310,3312],{"class":1676,"line":3311},17,[1674,3313,3314],{"class":1680},"// 期望输出：\n",[1674,3316,3318],{"class":1676,"line":3317},18,[1674,3319,3320],{"class":1680},"// 收集了依赖\n",[1674,3322,3324],{"class":1676,"line":3323},19,[1674,3325,3326],{"class":1680},"// 触发了更新\n",[1674,3328,3330],{"class":1676,"line":3329},20,[1674,3331,3320],{"class":1680},[1674,3333,3335,3337,3339,3341,3344,3346,3349],{"class":1676,"line":3334},21,[1674,3336,2333],{"class":1691},[1674,3338,1735],{"class":1695},[1674,3340,2338],{"class":1699},[1674,3342,3343],{"class":1691},"(count",[1674,3345,1735],{"class":1695},[1674,3347,3348],{"class":1691},"value)",[1674,3350,1726],{"class":1695},[1674,3352,3354,3356,3358,3361,3363,3365],{"class":1676,"line":3353},22,[1674,3355,1738],{"class":1691},[1674,3357,1735],{"class":1695},[1674,3359,3360],{"class":1691},"value ",[1674,3362,1696],{"class":1695},[1674,3364,2366],{"class":1716},[1674,3366,1726],{"class":1695},[1674,3368,3370,3372,3374,3376,3378,3380,3382],{"class":1676,"line":3369},23,[1674,3371,1738],{"class":1691},[1674,3373,1735],{"class":1695},[1674,3375,3360],{"class":1691},[1674,3377,1696],{"class":1695},[1674,3379,2366],{"class":1716},[1674,3381,2349],{"class":1695},[1674,3383,3384],{"class":1680}," // 值没变，这一行不应有任何打印\n",[1674,3386,3388,3390,3392,3394,3396,3398,3400],{"class":1676,"line":3387},24,[1674,3389,2333],{"class":1691},[1674,3391,1735],{"class":1695},[1674,3393,2338],{"class":1699},[1674,3395,3343],{"class":1691},[1674,3397,1735],{"class":1695},[1674,3399,3348],{"class":1691},[1674,3401,1726],{"class":1695},[1531,3403,3404,3405,3407,3408,3410,3411,3414],{},"完成后给自己加个挑战：参考 ",[1535,3406,2453],{}," 的思路，给 ",[1535,3409,3172],{}," 写一个 ",[1535,3412,3413],{},"myComputed(getter)","，要求依赖不变时重复读取只执行一次 getter。想一想，需要新增哪个标记？",[1640,3416],{},[1531,3418,3419],{},"🎉 恭喜你已经掌握 ref 与 computed 的底层原理啦！响应式数据会变了、依赖也收齐了，那「更新」到底是怎么安排执行顺序的？下一篇我们讲调度器与 nextTick，看看 Vue3 如何把多次修改合并成一次更新。",[3421,3422,3423],"style",{},"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}html pre.shiki code .s50WR, html code.shiki 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