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+",[1647,1757,1758],{"class":1661}," this.",[1647,1760,1666],{"class":1687},[1647,1762,1675],{"class":1743},[1647,1764,1696],{"class":1661},[1647,1766,1768],{"class":1649,"line":1767},6,[1647,1769,1770],{"class":1661},"    };\n",[1647,1772,1774],{"class":1649,"line":1773},7,[1647,1775,1776],{"class":1661},"}\n",[1545,1778,1780],{"id":1779},"new-做了哪四件事","new 做了哪四件事？",[1531,1782,1783,1784,1787],{},"当你使用 ",[1564,1785,1786],{},"new Person('Tom', 20)"," 时，JavaScript 引擎帮你做了下面四件事情：",[1789,1790,1791,1794,1805,1812],"ol",{},[1556,1792,1793],{},"创建了一个新对象（空对象）",[1556,1795,1796,1797,1800,1801,1804],{},"将这个新对象的内部 ",[1564,1798,1799],{},"[[Prototype]]"," 指向构造函数的 ",[1564,1802,1803],{},".prototype"," 属性",[1556,1806,1807,1808,1811],{},"调用构造函数，将 ",[1564,1809,1810],{},"this"," 指向刚创建的新对象，执行函数体代码",[1556,1813,1814],{},"如果构造函数没有返回对象，则返回新创建的对象",[1545,1816,1818],{"id":1817},"模拟实现-new","模拟实现 new",[1531,1820,1821,1822,1825],{},"用代码模拟实现一个简单的 ",[1564,1823,1824],{},"new"," 操作：",[1638,1827,1829],{"className":1640,"code":1828,"language":1642,"meta":1643,"style":1643},"function myNew(fn, ...args) {\n    const obj = {};\n    Object.setPrototypeOf(obj, fn.prototype);\n    const result = fn.apply(obj, args);\n    return typeof result === 'object' && result !== null ? result : obj;\n}\n",[1564,1830,1831,1855,1868,1898,1927,1972],{"__ignoreMap":1643},[1647,1832,1833,1835,1838,1840,1843,1845,1848,1851,1853],{"class":1649,"line":1650},[1647,1834,1654],{"class":1653},[1647,1836,1837],{"class":1657}," myNew",[1647,1839,1662],{"class":1661},[1647,1841,1842],{"class":1665},"fn",[1647,1844,1669],{"class":1661},[1647,1846,1847],{"class":1661}," ...",[1647,1849,1850],{"class":1665},"args",[1647,1852,1675],{"class":1661},[1647,1854,1678],{"class":1661},[1647,1856,1857,1860,1863,1865],{"class":1649,"line":1681},[1647,1858,1859],{"class":1653},"    const",[1647,1861,1862],{"class":1687}," obj",[1647,1864,1690],{"class":1661},[1647,1866,1867],{"class":1661}," {};\n",[1647,1869,1870,1873,1875,1878,1880,1883,1885,1889,1891,1894,1896],{"class":1649,"line":1699},[1647,1871,1872],{"class":1687},"    Object",[1647,1874,1737],{"class":1661},[1647,1876,1877],{"class":1657},"setPrototypeOf",[1647,1879,1662],{"class":1743},[1647,1881,1882],{"class":1687},"obj",[1647,1884,1669],{"class":1661},[1647,1886,1888],{"class":1887},"sYGMc"," fn",[1647,1890,1737],{"class":1661},[1647,1892,1893],{"class":1687},"prototype",[1647,1895,1675],{"class":1743},[1647,1897,1696],{"class":1661},[1647,1899,1900,1902,1905,1907,1909,1911,1914,1916,1918,1920,1923,1925],{"class":1649,"line":1713},[1647,1901,1859],{"class":1653},[1647,1903,1904],{"class":1687}," result",[1647,1906,1690],{"class":1661},[1647,1908,1888],{"class":1687},[1647,1910,1737],{"class":1661},[1647,1912,1913],{"class":1657},"apply",[1647,1915,1662],{"class":1743},[1647,1917,1882],{"class":1687},[1647,1919,1669],{"class":1661},[1647,1921,1922],{"class":1687}," args",[1647,1924,1675],{"class":1743},[1647,1926,1696],{"class":1661},[1647,1928,1929,1933,1936,1938,1941,1944,1947,1949,1952,1954,1957,1960,1963,1965,1968,1970],{"class":1649,"line":1731},[1647,1930,1932],{"class":1931},"s8pZq","    return",[1647,1934,1935],{"class":1661}," typeof",[1647,1937,1904],{"class":1687},[1647,1939,1940],{"class":1661}," ===",[1647,1942,1943],{"class":1661}," '",[1647,1945,1946],{"class":1749},"object",[1647,1948,1746],{"class":1661},[1647,1950,1951],{"class":1661}," &&",[1647,1953,1904],{"class":1687},[1647,1955,1956],{"class":1661}," !==",[1647,1958,1959],{"class":1661}," null",[1647,1961,1962],{"class":1661}," ?",[1647,1964,1904],{"class":1687},[1647,1966,1967],{"class":1661}," :",[1647,1969,1862],{"class":1687},[1647,1971,1696],{"class":1661},[1647,1973,1974],{"class":1649,"line":1767},[1647,1975,1776],{"class":1661},[1620,1977,1978],{},[1531,1979,1980,1981,1983],{},"模拟 ",[1564,1982,1824],{}," 的过程，能帮助你理解为什么构造函数能创建对象，以及原型链是如何连接的。",[1535,1985],{},[1526,1987,1989],{"id":1988},"原型与-prototype-属性","🧩 原型与 .prototype 属性",[1545,1991,1993],{"id":1992},"函数为什么有-prototype","函数为什么有 .prototype？",[1531,1995,1996,1997,1999,2000,2003],{},"每个函数在 JavaScript 中都有一个特殊属性叫 ",[1564,1998,1803],{},"，它是一个对象，默认只有一个 ",[1564,2001,2002],{},"constructor"," 属性，指向函数本身。",[1531,2005,2006,2007,2009,2010,2013],{},"这个 ",[1564,2008,1803],{}," 对象是构造函数创建实例对象时，实例的 ",[1564,2011,2012],{},"__proto__","（内部属性）指向的对象。",[1545,2015,2017,2018,2021],{"id":2016},"实例与原型的关系proto-vs-prototype","实例与原型的关系：",[1559,2019,2020],{},"proto"," vs .prototype",[1553,2023,2024,2033],{},[1556,2025,2026,2027,2029,2030,2032],{},"实例对象有一个 ",[1564,2028,2012],{}," 属性，指向它的构造函数的 ",[1564,2031,1803],{},"。",[1556,2034,2035,2036,2038],{},"构造函数有一个 ",[1564,2037,1803],{}," 属性，指向原型对象。",[1531,2040,2041,2042,2044],{},"这种关系就像桥梁，实例通过 ",[1564,2043,2012],{}," 连接到构造函数的原型，原型上可以定义共享方法。",[1638,2046,2048],{"className":1640,"code":2047,"language":1642,"meta":1643,"style":1643},"const p = new Person('Jack', 25);\nconsole.log(p.__proto__ === Person.prototype); // true\n",[1564,2049,2050,2085],{"__ignoreMap":1643},[1647,2051,2052,2055,2058,2061,2064,2066,2068,2070,2073,2075,2077,2081,2083],{"class":1649,"line":1650},[1647,2053,2054],{"class":1653},"const",[1647,2056,2057],{"class":1687}," p ",[1647,2059,2060],{"class":1661},"=",[1647,2062,2063],{"class":1661}," new",[1647,2065,1658],{"class":1657},[1647,2067,1662],{"class":1687},[1647,2069,1746],{"class":1661},[1647,2071,2072],{"class":1749},"Jack",[1647,2074,1746],{"class":1661},[1647,2076,1669],{"class":1661},[1647,2078,2080],{"class":2079},"smPcV"," 25",[1647,2082,1675],{"class":1687},[1647,2084,1696],{"class":1661},[1647,2086,2087,2090,2092,2094,2097,2099,2102,2105,2107,2109,2112,2115],{"class":1649,"line":1681},[1647,2088,2089],{"class":1687},"console",[1647,2091,1737],{"class":1661},[1647,2093,1740],{"class":1657},[1647,2095,2096],{"class":1687},"(p",[1647,2098,1737],{"class":1661},[1647,2100,2101],{"class":1687},"__proto__ ",[1647,2103,2104],{"class":1661},"===",[1647,2106,1658],{"class":1887},[1647,2108,1737],{"class":1661},[1647,2110,2111],{"class":1687},"prototype)",[1647,2113,2114],{"class":1661},";",[1647,2116,2118],{"class":2117},"syuKq"," // true\n",[1545,2120,2122],{"id":2121},"构造函数原型对象实例三者关系图","构造函数、原型对象、实例三者关系图",[1638,2124,2129],{"className":2125,"code":2127,"language":2128},[2126],"language-text","Person (构造函数)\n  |\n  | .prototype\n  ↓\nPerson.prototype (原型对象) --- (上级原型链) ---> Object.prototype --- null\n\np (实例对象)\n  |__ __proto__ --> Person.prototype\n","text",[1564,2130,2127],{"__ignoreMap":1643},[1620,2132,2133],{},[1531,2134,2135],{},"原型对象上的方法是所有实例共享的，可以节省内存，避免每个实例都创建一遍相同的方法。",[1535,2137],{},[1526,2139,2141],{"id":2140},"原型链与属性查找机制","🌲 原型链与属性查找机制",[1545,2143,2145],{"id":2144},"什么是原型链","什么是原型链？",[1531,2147,2148,2149,1800,2151,2153,2154,2157,2158,2160],{},"原型链就是实例对象通过 ",[1564,2150,2012],{},[1564,2152,1803],{}," 对象，后者又指向它的上级原型，直到 ",[1564,2155,2156],{},"Object.prototype","，再往上是 ",[1564,2159,1576],{},"，这条链条就像一个链子。",[1545,2162,2164],{"id":2163},"属性方法查找过程","属性/方法查找过程",[1531,2166,2167,2168,2170,2171,2173],{},"当你访问对象的属性或方法时，JavaScript 会先在自身属性中查找，如果找不到，会沿着 ",[1564,2169,2012],{}," 指向的原型对象查找，一直找到 ",[1564,2172,1576],{}," 停止。",[1531,2175,2176],{},"举个例子：",[1638,2178,2180],{"className":1640,"code":2179,"language":1642,"meta":1643,"style":1643},"console.log(p.sayHello); // 首先找 p 对象自身的 sayHello\n// 如果 p 自身没有，接着去 Person.prototype 查找\n",[1564,2181,2182,2202],{"__ignoreMap":1643},[1647,2183,2184,2186,2188,2190,2192,2194,2197,2199],{"class":1649,"line":1650},[1647,2185,2089],{"class":1687},[1647,2187,1737],{"class":1661},[1647,2189,1740],{"class":1657},[1647,2191,2096],{"class":1687},[1647,2193,1737],{"class":1661},[1647,2195,2196],{"class":1687},"sayHello)",[1647,2198,2114],{"class":1661},[1647,2200,2201],{"class":2117}," // 首先找 p 对象自身的 sayHello\n",[1647,2203,2204],{"class":1649,"line":1681},[1647,2205,2206],{"class":2117},"// 如果 p 自身没有，接着去 Person.prototype 查找\n",[1545,2208,2210],{"id":2209},"objectcreate-的作用与原理","Object.create 的作用与原理",[1531,2212,2213,2216,2217,2219,2220,2222],{},[1564,2214,2215],{},"Object.create(proto)"," 创建了一个新对象，这个新对象的 ",[1564,2218,2012],{}," 指向 ",[1564,2221,2020],{},"。这是创建继承链的一种简洁方法。",[1638,2224,2226],{"className":1640,"code":2225,"language":1642,"meta":1643,"style":1643},"const obj = Object.create(Person.prototype);\n",[1564,2227,2228],{"__ignoreMap":1643},[1647,2229,2230,2232,2235,2237,2240,2242,2245,2247,2250,2252,2254],{"class":1649,"line":1650},[1647,2231,2054],{"class":1653},[1647,2233,2234],{"class":1687}," obj ",[1647,2236,2060],{"class":1661},[1647,2238,2239],{"class":1687}," Object",[1647,2241,1737],{"class":1661},[1647,2243,2244],{"class":1657},"create",[1647,2246,1662],{"class":1687},[1647,2248,2249],{"class":1887},"Person",[1647,2251,1737],{"class":1661},[1647,2253,2111],{"class":1687},[1647,2255,1696],{"class":1661},[1620,2257,2258],{},[1531,2259,2260,2261,2264],{},"用 ",[1564,2262,2263],{},"Object.create"," 可以灵活地创建链式继承，而不是通过构造函数。",[1535,2266],{},[1526,2268,2270],{"id":2269},"继承的实现方式","🌿 继承的实现方式",[1545,2272,2273],{"id":2273},"原型链继承",[1531,2275,2276],{},"让子类型的原型指向父类型的实例，实现继承。",[1638,2278,2280],{"className":1640,"code":2279,"language":1642,"meta":1643,"style":1643},"function Parent() {\n    this.name = 'parent';\n}\nParent.prototype.say = function () {\n    console.log('hello');\n};\n\nfunction Child() {}\nChild.prototype = new Parent();\n\nconst c = new Child();\nc.say(); // hello\n",[1564,2281,2282,2294,2311,2315,2337,2359,2364,2370,2383,2404,2409,2427],{"__ignoreMap":1643},[1647,2283,2284,2286,2289,2292],{"class":1649,"line":1650},[1647,2285,1654],{"class":1653},[1647,2287,2288],{"class":1657}," Parent",[1647,2290,2291],{"class":1661},"()",[1647,2293,1678],{"class":1661},[1647,2295,2296,2298,2300,2302,2304,2307,2309],{"class":1649,"line":1681},[1647,2297,1684],{"class":1661},[1647,2299,1666],{"class":1687},[1647,2301,1690],{"class":1661},[1647,2303,1943],{"class":1661},[1647,2305,2306],{"class":1749},"parent",[1647,2308,1746],{"class":1661},[1647,2310,1696],{"class":1661},[1647,2312,2313],{"class":1649,"line":1699},[1647,2314,1776],{"class":1661},[1647,2316,2317,2320,2322,2324,2326,2329,2331,2333,2335],{"class":1649,"line":1713},[1647,2318,2319],{"class":1887},"Parent",[1647,2321,1737],{"class":1661},[1647,2323,1893],{"class":1687},[1647,2325,1737],{"class":1661},[1647,2327,2328],{"class":1657},"say",[1647,2330,1690],{"class":1661},[1647,2332,1723],{"class":1653},[1647,2334,1726],{"class":1661},[1647,2336,1678],{"class":1661},[1647,2338,2339,2342,2344,2346,2348,2350,2353,2355,2357],{"class":1649,"line":1731},[1647,2340,2341],{"class":1687},"    console",[1647,2343,1737],{"class":1661},[1647,2345,1740],{"class":1657},[1647,2347,1662],{"class":1743},[1647,2349,1746],{"class":1661},[1647,2351,2352],{"class":1749},"hello",[1647,2354,1746],{"class":1661},[1647,2356,1675],{"class":1743},[1647,2358,1696],{"class":1661},[1647,2360,2361],{"class":1649,"line":1767},[1647,2362,2363],{"class":1661},"};\n",[1647,2365,2366],{"class":1649,"line":1773},[1647,2367,2369],{"emptyLinePlaceholder":2368},true,"\n",[1647,2371,2373,2375,2378,2380],{"class":1649,"line":2372},8,[1647,2374,1654],{"class":1653},[1647,2376,2377],{"class":1657}," Child",[1647,2379,2291],{"class":1661},[1647,2381,2382],{"class":1661}," {}\n",[1647,2384,2386,2389,2391,2394,2396,2398,2400,2402],{"class":1649,"line":2385},9,[1647,2387,2388],{"class":1887},"Child",[1647,2390,1737],{"class":1661},[1647,2392,2393],{"class":1687},"prototype ",[1647,2395,2060],{"class":1661},[1647,2397,2063],{"class":1661},[1647,2399,2288],{"class":1657},[1647,2401,2291],{"class":1687},[1647,2403,1696],{"class":1661},[1647,2405,2407],{"class":1649,"line":2406},10,[1647,2408,2369],{"emptyLinePlaceholder":2368},[1647,2410,2412,2414,2417,2419,2421,2423,2425],{"class":1649,"line":2411},11,[1647,2413,2054],{"class":1653},[1647,2415,2416],{"class":1687}," c ",[1647,2418,2060],{"class":1661},[1647,2420,2063],{"class":1661},[1647,2422,2377],{"class":1657},[1647,2424,2291],{"class":1687},[1647,2426,1696],{"class":1661},[1647,2428,2430,2433,2435,2437,2439,2441],{"class":1649,"line":2429},12,[1647,2431,2432],{"class":1687},"c",[1647,2434,1737],{"class":1661},[1647,2436,2328],{"class":1657},[1647,2438,2291],{"class":1687},[1647,2440,2114],{"class":1661},[1647,2442,2443],{"class":2117}," // hello\n",[1531,2445,2446],{},"缺点是所有子实例共享父实例的引用属性。",[1545,2448,2450],{"id":2449},"构造函数继承call","构造函数继承（call）",[1531,2452,2453,2454,2456],{},"在子构造函数中调用父构造函数，改变 ",[1564,2455,1810],{}," 指向，避免引用共享。",[1638,2458,2460],{"className":1640,"code":2459,"language":1642,"meta":1643,"style":1643},"function Child() {\n    Parent.call(this);\n}\n",[1564,2461,2462,2472,2490],{"__ignoreMap":1643},[1647,2463,2464,2466,2468,2470],{"class":1649,"line":1650},[1647,2465,1654],{"class":1653},[1647,2467,2377],{"class":1657},[1647,2469,2291],{"class":1661},[1647,2471,1678],{"class":1661},[1647,2473,2474,2477,2479,2482,2484,2486,2488],{"class":1649,"line":1681},[1647,2475,2476],{"class":1687},"    Parent",[1647,2478,1737],{"class":1661},[1647,2480,2481],{"class":1657},"call",[1647,2483,1662],{"class":1743},[1647,2485,1810],{"class":1661},[1647,2487,1675],{"class":1743},[1647,2489,1696],{"class":1661},[1647,2491,2492],{"class":1649,"line":1699},[1647,2493,1776],{"class":1661},[1531,2495,2496],{},"缺点是只能继承父构造函数的属性和方法，不能继承原型上的方法。",[1545,2498,2499],{"id":2499},"组合继承",[1531,2501,2502],{},"结合上面两种方式，既继承属性也继承方法。",[1638,2504,2506],{"className":1640,"code":2505,"language":1642,"meta":1643,"style":1643},"function Child(name) {\n    Parent.call(this);\n    this.name = name;\n}\nChild.prototype = new Parent(); // 所以 Child.prototype.constructor 是指向 parent\nChild.prototype.constructor = Child; // 修正 constructor 指向为 child\n",[1564,2507,2508,2522,2538,2550,2554,2575],{"__ignoreMap":1643},[1647,2509,2510,2512,2514,2516,2518,2520],{"class":1649,"line":1650},[1647,2511,1654],{"class":1653},[1647,2513,2377],{"class":1657},[1647,2515,1662],{"class":1661},[1647,2517,1666],{"class":1665},[1647,2519,1675],{"class":1661},[1647,2521,1678],{"class":1661},[1647,2523,2524,2526,2528,2530,2532,2534,2536],{"class":1649,"line":1681},[1647,2525,2476],{"class":1687},[1647,2527,1737],{"class":1661},[1647,2529,2481],{"class":1657},[1647,2531,1662],{"class":1743},[1647,2533,1810],{"class":1661},[1647,2535,1675],{"class":1743},[1647,2537,1696],{"class":1661},[1647,2539,2540,2542,2544,2546,2548],{"class":1649,"line":1699},[1647,2541,1684],{"class":1661},[1647,2543,1666],{"class":1687},[1647,2545,1690],{"class":1661},[1647,2547,1693],{"class":1687},[1647,2549,1696],{"class":1661},[1647,2551,2552],{"class":1649,"line":1713},[1647,2553,1776],{"class":1661},[1647,2555,2556,2558,2560,2562,2564,2566,2568,2570,2572],{"class":1649,"line":1731},[1647,2557,2388],{"class":1887},[1647,2559,1737],{"class":1661},[1647,2561,2393],{"class":1687},[1647,2563,2060],{"class":1661},[1647,2565,2063],{"class":1661},[1647,2567,2288],{"class":1657},[1647,2569,2291],{"class":1687},[1647,2571,2114],{"class":1661},[1647,2573,2574],{"class":2117}," // 所以 Child.prototype.constructor 是指向 parent\n",[1647,2576,2577,2579,2581,2583,2585,2588,2590,2592,2594],{"class":1649,"line":1767},[1647,2578,2388],{"class":1887},[1647,2580,1737],{"class":1661},[1647,2582,1893],{"class":1687},[1647,2584,1737],{"class":1661},[1647,2586,2587],{"class":1687},"constructor ",[1647,2589,2060],{"class":1661},[1647,2591,2377],{"class":1687},[1647,2593,2114],{"class":1661},[1647,2595,2596],{"class":2117}," // 修正 constructor 指向为 child\n",[1545,2598,2600],{"id":2599},"classextends-的语法糖和本质","class/extends 的语法糖和本质",[1531,2602,2603,2604,2607],{},"ES6 引入 ",[1564,2605,2606],{},"class"," 语法，让继承写法更简洁：",[1638,2609,2611],{"className":1640,"code":2610,"language":1642,"meta":1643,"style":1643},"class Parent {\n    constructor() {\n        this.name = 'parent';\n    }\n    say() {\n        console.log('hello');\n    }\n}\n\nclass Child extends Parent {\n    constructor() {\n        super();\n    }\n}\n",[1564,2612,2613,2621,2630,2647,2652,2661,2681,2685,2689,2693,2706,2714,2723,2728],{"__ignoreMap":1643},[1647,2614,2615,2617,2619],{"class":1649,"line":1650},[1647,2616,2606],{"class":1653},[1647,2618,2288],{"class":1887},[1647,2620,1678],{"class":1661},[1647,2622,2623,2626,2628],{"class":1649,"line":1681},[1647,2624,2625],{"class":1653},"    constructor",[1647,2627,2291],{"class":1661},[1647,2629,1678],{"class":1661},[1647,2631,2632,2635,2637,2639,2641,2643,2645],{"class":1649,"line":1699},[1647,2633,2634],{"class":1661},"        this.",[1647,2636,1666],{"class":1687},[1647,2638,1690],{"class":1661},[1647,2640,1943],{"class":1661},[1647,2642,2306],{"class":1749},[1647,2644,1746],{"class":1661},[1647,2646,1696],{"class":1661},[1647,2648,2649],{"class":1649,"line":1713},[1647,2650,2651],{"class":1661},"    }\n",[1647,2653,2654,2657,2659],{"class":1649,"line":1731},[1647,2655,2656],{"class":1743},"    say",[1647,2658,2291],{"class":1661},[1647,2660,1678],{"class":1661},[1647,2662,2663,2665,2667,2669,2671,2673,2675,2677,2679],{"class":1649,"line":1767},[1647,2664,1734],{"class":1687},[1647,2666,1737],{"class":1661},[1647,2668,1740],{"class":1657},[1647,2670,1662],{"class":1743},[1647,2672,1746],{"class":1661},[1647,2674,2352],{"class":1749},[1647,2676,1746],{"class":1661},[1647,2678,1675],{"class":1743},[1647,2680,1696],{"class":1661},[1647,2682,2683],{"class":1649,"line":1773},[1647,2684,2651],{"class":1661},[1647,2686,2687],{"class":1649,"line":2372},[1647,2688,1776],{"class":1661},[1647,2690,2691],{"class":1649,"line":2385},[1647,2692,2369],{"emptyLinePlaceholder":2368},[1647,2694,2695,2697,2699,2702,2704],{"class":1649,"line":2406},[1647,2696,2606],{"class":1653},[1647,2698,2377],{"class":1887},[1647,2700,2701],{"class":1653}," extends",[1647,2703,2288],{"class":1887},[1647,2705,1678],{"class":1661},[1647,2707,2708,2710,2712],{"class":1649,"line":2411},[1647,2709,2625],{"class":1653},[1647,2711,2291],{"class":1661},[1647,2713,1678],{"class":1661},[1647,2715,2716,2719,2721],{"class":1649,"line":2429},[1647,2717,2718],{"class":1687},"        super",[1647,2720,2291],{"class":1743},[1647,2722,1696],{"class":1661},[1647,2724,2726],{"class":1649,"line":2725},13,[1647,2727,2651],{"class":1661},[1647,2729,2731],{"class":1649,"line":2730},14,[1647,2732,1776],{"class":1661},[1531,2734,2735],{},"本质还是基于原型链和构造函数，只是语法更清晰，更像传统面向对象语言。",[1535,2737],{},[1526,2739,2741],{"id":2740},"小节总结","🧾 小节总结",[1553,2743,2744,2747,2756,2767,2773],{},[1556,2745,2746],{},"JavaScript 的对象模型基于值类型和引用类型的区分，万物皆对象。",[1556,2748,2749,2750,2752,2753,2755],{},"使用构造函数和 ",[1564,2751,1824],{}," 可以创建对象，",[1564,2754,1824],{}," 做了四件关键事。",[1556,2757,2758,2759,2761,2762,1800,2764,2766],{},"每个函数都有 ",[1564,2760,1803],{},"，实例的 ",[1564,2763,2012],{},[1564,2765,1803],{},"，实现原型继承。",[1556,2768,2769,2770,2772],{},"属性查找沿着原型链进行，",[1564,2771,2263],{}," 是创建原型链的利器。",[1556,2774,2775,2776,2778],{},"继承可以通过原型链、构造函数、组合继承等方式实现，ES6 ",[1564,2777,2606],{}," 是语法糖，本质依旧是原型链和构造函数。",[1535,2780],{},[1526,2782,2784],{"id":2783},"知识问答qa","❓ 知识问答（Q&A）",[1531,2786,2787,2788,2790,2791,2793],{},"Q：构造函数和普通函数有什么区别？",[1585,2789],{},"\nA：构造函数通常首字母大写，用来创建对象，配合 ",[1564,2792,1824],{}," 使用，普通函数没有这个限制。",[1531,2795,2796,2797,2799],{},"Q：为什么要用原型链实现继承？",[1585,2798],{},"\nA：原型链可以让多个实例共享父类方法，节省内存，写法也更灵活。",[1531,2801,2802,2803,2805,2806,2808,2809,2811],{},"Q：",[1564,2804,2263],{}," 和直接构造函数继承有什么区别？",[1585,2807],{},"\nA：",[1564,2810,2263],{}," 创建对象时能指定原型，更灵活地控制继承关系；构造函数继承更多是属性复制。",[1535,2813],{},[1526,2815,2817],{"id":2816},"小练习","🧪 小练习",[1789,2819,2820],{},[1556,2821,2749,2822,2824,2825,2828,2829,2832,2833,2836,2837,2840],{},[1564,2823,1824],{}," 创建一个 ",[1564,2826,2827],{},"Car"," 对象，有 ",[1564,2830,2831],{},"brand"," 和 ",[1564,2834,2835],{},"speed"," 属性，以及一个 ",[1564,2838,2839],{},"run"," 方法，实现打印汽车运行状态。",[1638,2842,2844],{"className":1640,"code":2843,"language":1642,"meta":1643,"style":1643},"function Car(brand, speed) {\n    // 你的代码\n}\n\nconst myCar = new Car('Toyota', 80);\nmyCar.run(); // 输出: Toyota is running at 80 km/h\n",[1564,2845,2846,2866,2871,2875,2879,2910],{"__ignoreMap":1643},[1647,2847,2848,2850,2853,2855,2857,2859,2862,2864],{"class":1649,"line":1650},[1647,2849,1654],{"class":1653},[1647,2851,2852],{"class":1657}," Car",[1647,2854,1662],{"class":1661},[1647,2856,2831],{"class":1665},[1647,2858,1669],{"class":1661},[1647,2860,2861],{"class":1665}," speed",[1647,2863,1675],{"class":1661},[1647,2865,1678],{"class":1661},[1647,2867,2868],{"class":1649,"line":1681},[1647,2869,2870],{"class":2117},"    // 你的代码\n",[1647,2872,2873],{"class":1649,"line":1699},[1647,2874,1776],{"class":1661},[1647,2876,2877],{"class":1649,"line":1713},[1647,2878,2369],{"emptyLinePlaceholder":2368},[1647,2880,2881,2883,2886,2888,2890,2892,2894,2896,2899,2901,2903,2906,2908],{"class":1649,"line":1731},[1647,2882,2054],{"class":1653},[1647,2884,2885],{"class":1687}," myCar ",[1647,2887,2060],{"class":1661},[1647,2889,2063],{"class":1661},[1647,2891,2852],{"class":1657},[1647,2893,1662],{"class":1687},[1647,2895,1746],{"class":1661},[1647,2897,2898],{"class":1749},"Toyota",[1647,2900,1746],{"class":1661},[1647,2902,1669],{"class":1661},[1647,2904,2905],{"class":2079}," 80",[1647,2907,1675],{"class":1687},[1647,2909,1696],{"class":1661},[1647,2911,2912,2915,2917,2919,2921,2923],{"class":1649,"line":1767},[1647,2913,2914],{"class":1687},"myCar",[1647,2916,1737],{"class":1661},[1647,2918,2839],{"class":1657},[1647,2920,2291],{"class":1687},[1647,2922,2114],{"class":1661},[1647,2924,2925],{"class":2117}," // 输出: Toyota is running at 80 km/h\n",[1789,2927,2928],{"start":1681},[1556,2929,2930,2931,2934,2935,2938],{},"用原型链方式实现一个动物（Animal）和狗（Dog）的继承，Animal 有 ",[1564,2932,2933],{},"eat"," 方法，Dog 继承 Animal，并新增 ",[1564,2936,2937],{},"bark"," 方法。",[1638,2940,2942],{"className":1640,"code":2941,"language":1642,"meta":1643,"style":1643},"function Animal() {\n    // 你的代码\n}\n\nAnimal.prototype.eat = function () {\n    console.log('Eating food');\n};\n\nfunction Dog() {\n    // 你的代码\n}\n\n// 继承 Animal 原型\n\nDog.prototype.bark = function () {\n    console.log('Woof!');\n};\n\nconst dog = new Dog();\ndog.eat();\ndog.bark();\n",[1564,2943,2944,2955,2959,2963,2967,2988,3009,3013,3017,3028,3032,3036,3040,3045,3049,3071,3093,3098,3103,3121,3135],{"__ignoreMap":1643},[1647,2945,2946,2948,2951,2953],{"class":1649,"line":1650},[1647,2947,1654],{"class":1653},[1647,2949,2950],{"class":1657}," Animal",[1647,2952,2291],{"class":1661},[1647,2954,1678],{"class":1661},[1647,2956,2957],{"class":1649,"line":1681},[1647,2958,2870],{"class":2117},[1647,2960,2961],{"class":1649,"line":1699},[1647,2962,1776],{"class":1661},[1647,2964,2965],{"class":1649,"line":1713},[1647,2966,2369],{"emptyLinePlaceholder":2368},[1647,2968,2969,2972,2974,2976,2978,2980,2982,2984,2986],{"class":1649,"line":1731},[1647,2970,2971],{"class":1887},"Animal",[1647,2973,1737],{"class":1661},[1647,2975,1893],{"class":1687},[1647,2977,1737],{"class":1661},[1647,2979,2933],{"class":1657},[1647,2981,1690],{"class":1661},[1647,2983,1723],{"class":1653},[1647,2985,1726],{"class":1661},[1647,2987,1678],{"class":1661},[1647,2989,2990,2992,2994,2996,2998,3000,3003,3005,3007],{"class":1649,"line":1767},[1647,2991,2341],{"class":1687},[1647,2993,1737],{"class":1661},[1647,2995,1740],{"class":1657},[1647,2997,1662],{"class":1743},[1647,2999,1746],{"class":1661},[1647,3001,3002],{"class":1749},"Eating food",[1647,3004,1746],{"class":1661},[1647,3006,1675],{"class":1743},[1647,3008,1696],{"class":1661},[1647,3010,3011],{"class":1649,"line":1773},[1647,3012,2363],{"class":1661},[1647,3014,3015],{"class":1649,"line":2372},[1647,3016,2369],{"emptyLinePlaceholder":2368},[1647,3018,3019,3021,3024,3026],{"class":1649,"line":2385},[1647,3020,1654],{"class":1653},[1647,3022,3023],{"class":1657}," Dog",[1647,3025,2291],{"class":1661},[1647,3027,1678],{"class":1661},[1647,3029,3030],{"class":1649,"line":2406},[1647,3031,2870],{"class":2117},[1647,3033,3034],{"class":1649,"line":2411},[1647,3035,1776],{"class":1661},[1647,3037,3038],{"class":1649,"line":2429},[1647,3039,2369],{"emptyLinePlaceholder":2368},[1647,3041,3042],{"class":1649,"line":2725},[1647,3043,3044],{"class":2117},"// 继承 Animal 原型\n",[1647,3046,3047],{"class":1649,"line":2730},[1647,3048,2369],{"emptyLinePlaceholder":2368},[1647,3050,3052,3055,3057,3059,3061,3063,3065,3067,3069],{"class":1649,"line":3051},15,[1647,3053,3054],{"class":1887},"Dog",[1647,3056,1737],{"class":1661},[1647,3058,1893],{"class":1687},[1647,3060,1737],{"class":1661},[1647,3062,2937],{"class":1657},[1647,3064,1690],{"class":1661},[1647,3066,1723],{"class":1653},[1647,3068,1726],{"class":1661},[1647,3070,1678],{"class":1661},[1647,3072,3074,3076,3078,3080,3082,3084,3087,3089,3091],{"class":1649,"line":3073},16,[1647,3075,2341],{"class":1687},[1647,3077,1737],{"class":1661},[1647,3079,1740],{"class":1657},[1647,3081,1662],{"class":1743},[1647,3083,1746],{"class":1661},[1647,3085,3086],{"class":1749},"Woof!",[1647,3088,1746],{"class":1661},[1647,3090,1675],{"class":1743},[1647,3092,1696],{"class":1661},[1647,3094,3096],{"class":1649,"line":3095},17,[1647,3097,2363],{"class":1661},[1647,3099,3101],{"class":1649,"line":3100},18,[1647,3102,2369],{"emptyLinePlaceholder":2368},[1647,3104,3106,3108,3111,3113,3115,3117,3119],{"class":1649,"line":3105},19,[1647,3107,2054],{"class":1653},[1647,3109,3110],{"class":1687}," dog ",[1647,3112,2060],{"class":1661},[1647,3114,2063],{"class":1661},[1647,3116,3023],{"class":1657},[1647,3118,2291],{"class":1687},[1647,3120,1696],{"class":1661},[1647,3122,3124,3127,3129,3131,3133],{"class":1649,"line":3123},20,[1647,3125,3126],{"class":1687},"dog",[1647,3128,1737],{"class":1661},[1647,3130,2933],{"class":1657},[1647,3132,2291],{"class":1687},[1647,3134,1696],{"class":1661},[1647,3136,3138,3140,3142,3144,3146],{"class":1649,"line":3137},21,[1647,3139,3126],{"class":1687},[1647,3141,1737],{"class":1661},[1647,3143,2937],{"class":1657},[1647,3145,2291],{"class":1687},[1647,3147,1696],{"class":1661},[1535,3149],{},[1531,3151,3152],{},"🎉 恭喜你已经掌握 JavaScript 面向对象编程中对象模型、构造函数与 new、原型链、属性查找以及继承的关键技能啦！用这些知识去写更优雅的代码吧！",[3154,3155,3156],"style",{},"html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}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 .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 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