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函数的各种用法，理解函数的创建、调用及执行过程，搞明白函数作用域、闭包和参数传递等重要知识点。掌握这些内容后，你能写出更简洁、高效的代码，避免常见陷阱，提升前端开发能力。",[1534,1535],"hr",{},[1525,1537,1539],{"id":1538},"函数是什么从零开始理解","🔍 函数是什么？从零开始理解",[1530,1541,1542],{},"JS 函数，本质上是一段可重复执行的代码块。它帮我们把复杂的任务拆分成小块，方便调用和管理。就像厨房里的厨师，函数是完成某道菜的步骤，厨师按照步骤来做菜，函数就按代码执行任务。",[1530,1544,1545],{},"常见的创建函数方式有三种：",[1547,1548,1553],"pre",{"className":1549,"code":1550,"language":1551,"meta":1552,"style":1552},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","// 函数声明\nfunction greet(name) {\n    return '你好，' + name + '！';\n}\n\n// 函数表达式\nconst greet2 = function (name) {\n    return '你好，' + name + '！';\n};\n\n// 箭头函数（ES6，不在本篇重点）\nconst greet3 = name => '你好，' + name + '！';\n","js","",[1554,1555,1556,1565,1590,1626,1632,1639,1645,1669,1694,1700,1705,1711],"code",{"__ignoreMap":1552},[1557,1558,1561],"span",{"class":1559,"line":1560},"line",1,[1557,1562,1564],{"class":1563},"syuKq","// 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name",[1557,1615,1609],{"class":1578},[1557,1617,1599],{"class":1578},[1557,1619,1620],{"class":1602},"！",[1557,1622,1606],{"class":1578},[1557,1624,1625],{"class":1578},";\n",[1557,1627,1629],{"class":1559,"line":1628},4,[1557,1630,1631],{"class":1578},"}\n",[1557,1633,1635],{"class":1559,"line":1634},5,[1557,1636,1638],{"emptyLinePlaceholder":1637},true,"\n",[1557,1640,1642],{"class":1559,"line":1641},6,[1557,1643,1644],{"class":1563},"// 函数表达式\n",[1557,1646,1648,1651,1654,1657,1660,1663,1665,1667],{"class":1559,"line":1647},7,[1557,1649,1650],{"class":1570},"const",[1557,1652,1653],{"class":1612}," greet2 ",[1557,1655,1656],{"class":1578},"=",[1557,1658,1659],{"class":1570}," function",[1557,1661,1662],{"class":1578}," 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函数的调用和返回",[1530,1761,1762],{},"调用函数就是让它执行里面的代码，比如：",[1547,1764,1766],{"className":1549,"code":1765,"language":1551,"meta":1552,"style":1552},"console.log(greet('小明'));\n",[1554,1767,1768],{"__ignoreMap":1552},[1557,1769,1770,1773,1776,1779,1781,1784,1786,1788,1791,1793,1796],{"class":1559,"line":1560},[1557,1771,1772],{"class":1612},"console",[1557,1774,1775],{"class":1578},".",[1557,1777,1778],{"class":1574},"log",[1557,1780,1579],{"class":1612},[1557,1782,1783],{"class":1574},"greet",[1557,1785,1579],{"class":1612},[1557,1787,1606],{"class":1578},[1557,1789,1790],{"class":1602},"小明",[1557,1792,1606],{"class":1578},[1557,1794,1795],{"class":1612},"))",[1557,1797,1625],{"class":1578},[1530,1799,1800,1801,1804,1805,1808],{},"这句代码会输出“你好，小明！”。函数执行完后，遇到 ",[1554,1802,1803],{},"return"," 会把结果返回给调用者。如果没有返回值，默认返回 ",[1554,1806,1807],{},"undefined","。",[1530,1810,1811],{},"函数也可以不带参数，比如：",[1547,1813,1815],{"className":1549,"code":1814,"language":1551,"meta":1552,"style":1552},"function sayHi() {\n    console.log('嗨！');\n}\nsayHi();\n",[1554,1816,1817,1829,1852,1856],{"__ignoreMap":1552},[1557,1818,1819,1821,1824,1827],{"class":1559,"line":1560},[1557,1820,1571],{"class":1570},[1557,1822,1823],{"class":1574}," sayHi",[1557,1825,1826],{"class":1578},"()",[1557,1828,1589],{"class":1578},[1557,1830,1831,1834,1836,1838,1841,1843,1846,1848,1850],{"class":1559,"line":1567},[1557,1832,1833],{"class":1612},"    console",[1557,1835,1775],{"class":1578},[1557,1837,1778],{"class":1574},[1557,1839,1579],{"class":1840},"sd2Uz",[1557,1842,1606],{"class":1578},[1557,1844,1845],{"class":1602},"嗨！",[1557,1847,1606],{"class":1578},[1557,1849,1586],{"class":1840},[1557,1851,1625],{"class":1578},[1557,1853,1854],{"class":1559,"line":1592},[1557,1855,1631],{"class":1578},[1557,1857,1858,1861,1863],{"class":1559,"line":1628},[1557,1859,1860],{"class":1574},"sayHi",[1557,1862,1826],{"class":1612},[1557,1864,1625],{"class":1578},[1534,1866],{},[1525,1868,1870],{"id":1869},"作用域与函数作用域","🧠 作用域与函数作用域",[1530,1872,1873],{},"作用域决定了变量在哪里有效。JavaScript 函数自带“作用域”，函数内部定义的变量外面访问不到。",[1547,1875,1877],{"className":1549,"code":1876,"language":1551,"meta":1552,"style":1552},"function foo() {\n    let message = 'Hello';\n    console.log(message);\n}\nfoo();\nconsole.log(message); // 报错，message 未定义\n",[1554,1878,1879,1890,1910,1927,1931,1940],{"__ignoreMap":1552},[1557,1880,1881,1883,1886,1888],{"class":1559,"line":1560},[1557,1882,1571],{"class":1570},[1557,1884,1885],{"class":1574}," foo",[1557,1887,1826],{"class":1578},[1557,1889,1589],{"class":1578},[1557,1891,1892,1895,1898,1901,1903,1906,1908],{"class":1559,"line":1567},[1557,1893,1894],{"class":1570},"    let",[1557,1896,1897],{"class":1612}," message",[1557,1899,1900],{"class":1578}," =",[1557,1902,1599],{"class":1578},[1557,1904,1905],{"class":1602},"Hello",[1557,1907,1606],{"class":1578},[1557,1909,1625],{"class":1578},[1557,1911,1912,1914,1916,1918,1920,1923,1925],{"class":1559,"line":1592},[1557,1913,1833],{"class":1612},[1557,1915,1775],{"class":1578},[1557,1917,1778],{"class":1574},[1557,1919,1579],{"class":1840},[1557,1921,1922],{"class":1612},"message",[1557,1924,1586],{"class":1840},[1557,1926,1625],{"class":1578},[1557,1928,1929],{"class":1559,"line":1628},[1557,1930,1631],{"class":1578},[1557,1932,1933,1936,1938],{"class":1559,"line":1634},[1557,1934,1935],{"class":1574},"foo",[1557,1937,1826],{"class":1612},[1557,1939,1625],{"class":1578},[1557,1941,1942,1944,1946,1948,1951,1954],{"class":1559,"line":1641},[1557,1943,1772],{"class":1612},[1557,1945,1775],{"class":1578},[1557,1947,1778],{"class":1574},[1557,1949,1950],{"class":1612},"(message)",[1557,1952,1953],{"class":1578},";",[1557,1955,1956],{"class":1563}," // 报错，message 未定义\n",[1530,1958,1959],{},"函数执行时，会形成一个独立的作用域，里面的变量不会影响外面，外面也访问不到函数内部变量。",[1749,1961,1962],{},[1530,1963,1964],{},"理解函数作用域对避免变量冲突非常重要，尤其是在大型项目里。",[1534,1966],{},[1525,1968,1970],{"id":1969},"参数与实参传值还是传引用","🔄 参数与实参：传值还是传引用？",[1530,1972,1973],{},"JS 函数传递参数时，有两个重要概念：",[1975,1976,1977,1985],"ul",{},[1978,1979,1980,1984],"li",{},[1981,1982,1983],"strong",{},"基本类型参数","（比如数字、字符串、布尔）是传值的，函数内修改不会影响外面变量。",[1978,1986,1987,1990],{},[1981,1988,1989],{},"引用类型参数","（比如对象、数组）是传引用的，函数内修改会影响外部。",[1530,1992,1993],{},"举个例子：",[1547,1995,1997],{"className":1549,"code":1996,"language":1551,"meta":1552,"style":1552},"function changeNumber(num) {\n    num = 100;\n}\nlet a = 50;\nchangeNumber(a);\nconsole.log(a); // 50，外部没变\n\nfunction changeObj(obj) {\n    obj.name = '小明';\n}\nlet person = { name: '小红' };\nchangeObj(person);\nconsole.log(person.name); // 小明\n",[1554,1998,1999,2015,2028,2032,2047,2057,2072,2076,2092,2111,2115,2142,2152],{"__ignoreMap":1552},[1557,2000,2001,2003,2006,2008,2011,2013],{"class":1559,"line":1560},[1557,2002,1571],{"class":1570},[1557,2004,2005],{"class":1574}," changeNumber",[1557,2007,1579],{"class":1578},[1557,2009,2010],{"class":1582},"num",[1557,2012,1586],{"class":1578},[1557,2014,1589],{"class":1578},[1557,2016,2017,2020,2022,2026],{"class":1559,"line":1567},[1557,2018,2019],{"class":1612},"    num",[1557,2021,1900],{"class":1578},[1557,2023,2025],{"class":2024},"smPcV"," 100",[1557,2027,1625],{"class":1578},[1557,2029,2030],{"class":1559,"line":1592},[1557,2031,1631],{"class":1578},[1557,2033,2034,2037,2040,2042,2045],{"class":1559,"line":1628},[1557,2035,2036],{"class":1570},"let",[1557,2038,2039],{"class":1612}," a ",[1557,2041,1656],{"class":1578},[1557,2043,2044],{"class":2024}," 50",[1557,2046,1625],{"class":1578},[1557,2048,2049,2052,2055],{"class":1559,"line":1634},[1557,2050,2051],{"class":1574},"changeNumber",[1557,2053,2054],{"class":1612},"(a)",[1557,2056,1625],{"class":1578},[1557,2058,2059,2061,2063,2065,2067,2069],{"class":1559,"line":1641},[1557,2060,1772],{"class":1612},[1557,2062,1775],{"class":1578},[1557,2064,1778],{"class":1574},[1557,2066,2054],{"class":1612},[1557,2068,1953],{"class":1578},[1557,2070,2071],{"class":1563}," // 50，外部没变\n",[1557,2073,2074],{"class":1559,"line":1647},[1557,2075,1638],{"emptyLinePlaceholder":1637},[1557,2077,2078,2080,2083,2085,2088,2090],{"class":1559,"line":1671},[1557,2079,1571],{"class":1570},[1557,2081,2082],{"class":1574}," changeObj",[1557,2084,1579],{"class":1578},[1557,2086,2087],{"class":1582},"obj",[1557,2089,1586],{"class":1578},[1557,2091,1589],{"class":1578},[1557,2093,2094,2097,2099,2101,2103,2105,2107,2109],{"class":1559,"line":1696},[1557,2095,2096],{"class":1612},"    obj",[1557,2098,1775],{"class":1578},[1557,2100,1583],{"class":1612},[1557,2102,1900],{"class":1578},[1557,2104,1599],{"class":1578},[1557,2106,1790],{"class":1602},[1557,2108,1606],{"class":1578},[1557,2110,1625],{"class":1578},[1557,2112,2113],{"class":1559,"line":1702},[1557,2114,1631],{"class":1578},[1557,2116,2117,2119,2122,2124,2127,2129,2132,2134,2137,2139],{"class":1559,"line":1707},[1557,2118,2036],{"class":1570},[1557,2120,2121],{"class":1612}," person ",[1557,2123,1656],{"class":1578},[1557,2125,2126],{"class":1578}," {",[1557,2128,1613],{"class":1840},[1557,2130,2131],{"class":1578},":",[1557,2133,1599],{"class":1578},[1557,2135,2136],{"class":1602},"小红",[1557,2138,1606],{"class":1578},[1557,2140,2141],{"class":1578}," };\n",[1557,2143,2144,2147,2150],{"class":1559,"line":1713},[1557,2145,2146],{"class":1574},"changeObj",[1557,2148,2149],{"class":1612},"(person)",[1557,2151,1625],{"class":1578},[1557,2153,2155,2157,2159,2161,2164,2166,2169,2171],{"class":1559,"line":2154},13,[1557,2156,1772],{"class":1612},[1557,2158,1775],{"class":1578},[1557,2160,1778],{"class":1574},[1557,2162,2163],{"class":1612},"(person",[1557,2165,1775],{"class":1578},[1557,2167,2168],{"class":1612},"name)",[1557,2170,1953],{"class":1578},[1557,2172,2173],{"class":1563}," // 小明\n",[1534,2175],{},[1525,2177,2179],{"id":2178},"闭包函数的神奇力量","🔒 闭包：函数的神奇力量",[1530,2181,2182],{},"闭包是 JS 函数最强大的特点之一。简单来说，函数可以“记住”创建它时外部的变量，即使外部函数已经执行完。",[1547,2184,2186],{"className":1549,"code":2185,"language":1551,"meta":1552,"style":1552},"function outer() {\n    let count = 0;\n    return function inner() {\n        count++;\n        console.log('计数器：', count);\n    };\n}\n\nconst counter = outer();\ncounter(); // 计数器：1\ncounter(); // 计数器：2\n",[1554,2187,2188,2199,2213,2226,2234,2261,2266,2270,2274,2289,2301],{"__ignoreMap":1552},[1557,2189,2190,2192,2195,2197],{"class":1559,"line":1560},[1557,2191,1571],{"class":1570},[1557,2193,2194],{"class":1574}," outer",[1557,2196,1826],{"class":1578},[1557,2198,1589],{"class":1578},[1557,2200,2201,2203,2206,2208,2211],{"class":1559,"line":1567},[1557,2202,1894],{"class":1570},[1557,2204,2205],{"class":1612}," count",[1557,2207,1900],{"class":1578},[1557,2209,2210],{"class":2024}," 0",[1557,2212,1625],{"class":1578},[1557,2214,2215,2217,2219,2222,2224],{"class":1559,"line":1592},[1557,2216,1596],{"class":1595},[1557,2218,1659],{"class":1570},[1557,2220,2221],{"class":1574}," inner",[1557,2223,1826],{"class":1578},[1557,2225,1589],{"class":1578},[1557,2227,2228,2231],{"class":1559,"line":1628},[1557,2229,2230],{"class":1612},"        count",[1557,2232,2233],{"class":1578},"++;\n",[1557,2235,2236,2239,2241,2243,2245,2247,2250,2252,2255,2257,2259],{"class":1559,"line":1634},[1557,2237,2238],{"class":1612},"        console",[1557,2240,1775],{"class":1578},[1557,2242,1778],{"class":1574},[1557,2244,1579],{"class":1840},[1557,2246,1606],{"class":1578},[1557,2248,2249],{"class":1602},"计数器：",[1557,2251,1606],{"class":1578},[1557,2253,2254],{"class":1578},",",[1557,2256,2205],{"class":1612},[1557,2258,1586],{"class":1840},[1557,2260,1625],{"class":1578},[1557,2262,2263],{"class":1559,"line":1641},[1557,2264,2265],{"class":1578},"    };\n",[1557,2267,2268],{"class":1559,"line":1647},[1557,2269,1631],{"class":1578},[1557,2271,2272],{"class":1559,"line":1671},[1557,2273,1638],{"emptyLinePlaceholder":1637},[1557,2275,2276,2278,2281,2283,2285,2287],{"class":1559,"line":1696},[1557,2277,1650],{"class":1570},[1557,2279,2280],{"class":1612}," counter ",[1557,2282,1656],{"class":1578},[1557,2284,2194],{"class":1574},[1557,2286,1826],{"class":1612},[1557,2288,1625],{"class":1578},[1557,2290,2291,2294,2296,2298],{"class":1559,"line":1702},[1557,2292,2293],{"class":1574},"counter",[1557,2295,1826],{"class":1612},[1557,2297,1953],{"class":1578},[1557,2299,2300],{"class":1563}," // 计数器：1\n",[1557,2302,2303,2305,2307,2309],{"class":1559,"line":1707},[1557,2304,2293],{"class":1574},[1557,2306,1826],{"class":1612},[1557,2308,1953],{"class":1578},[1557,2310,2311],{"class":1563}," // 计数器：2\n",[1530,2313,2314,2315,2318,2319,2322,2323,2326,2327,2329],{},"这里 ",[1554,2316,2317],{},"inner"," 函数访问了 ",[1554,2320,2321],{},"outer"," 函数的变量 ",[1554,2324,2325],{},"count","，并且 ",[1554,2328,2325],{}," 信息被保留下来，形成闭包。",[1530,2331,2332],{},"闭包非常适合做计数器、缓存数据这样的场景。",[1534,2334],{},[1525,2336,2338],{"id":2337},"函数声明-vs-函数表达式","📝 函数声明 vs 函数表达式",[1530,2340,2341],{},"两者看起来很像，但有个重要区别是“提升”（hoisting）。",[1530,2343,2344],{},"函数声明会被 JS 解析器提前加载，你可以在声明之前调用。",[1547,2346,2348],{"className":1549,"code":2347,"language":1551,"meta":1552,"style":1552},"sayHello();\n\nfunction sayHello() {\n    console.log('Hello');\n}\n",[1554,2349,2350,2359,2363,2374,2394],{"__ignoreMap":1552},[1557,2351,2352,2355,2357],{"class":1559,"line":1560},[1557,2353,2354],{"class":1574},"sayHello",[1557,2356,1826],{"class":1612},[1557,2358,1625],{"class":1578},[1557,2360,2361],{"class":1559,"line":1567},[1557,2362,1638],{"emptyLinePlaceholder":1637},[1557,2364,2365,2367,2370,2372],{"class":1559,"line":1592},[1557,2366,1571],{"class":1570},[1557,2368,2369],{"class":1574}," sayHello",[1557,2371,1826],{"class":1578},[1557,2373,1589],{"class":1578},[1557,2375,2376,2378,2380,2382,2384,2386,2388,2390,2392],{"class":1559,"line":1628},[1557,2377,1833],{"class":1612},[1557,2379,1775],{"class":1578},[1557,2381,1778],{"class":1574},[1557,2383,1579],{"class":1840},[1557,2385,1606],{"class":1578},[1557,2387,1905],{"class":1602},[1557,2389,1606],{"class":1578},[1557,2391,1586],{"class":1840},[1557,2393,1625],{"class":1578},[1557,2395,2396],{"class":1559,"line":1634},[1557,2397,1631],{"class":1578},[1530,2399,2400],{},"函数表达式则不会提升，必须先定义再调用，否则报错。",[1547,2402,2404],{"className":1549,"code":2403,"language":1551,"meta":1552,"style":1552},"sayHi(); // 报错\n\nconst sayHi = function () {\n    console.log('Hi');\n};\n",[1554,2405,2406,2417,2421,2437,2458],{"__ignoreMap":1552},[1557,2407,2408,2410,2412,2414],{"class":1559,"line":1560},[1557,2409,1860],{"class":1574},[1557,2411,1826],{"class":1612},[1557,2413,1953],{"class":1578},[1557,2415,2416],{"class":1563}," // 报错\n",[1557,2418,2419],{"class":1559,"line":1567},[1557,2420,1638],{"emptyLinePlaceholder":1637},[1557,2422,2423,2425,2428,2430,2432,2435],{"class":1559,"line":1592},[1557,2424,1650],{"class":1570},[1557,2426,2427],{"class":1612}," sayHi ",[1557,2429,1656],{"class":1578},[1557,2431,1659],{"class":1570},[1557,2433,2434],{"class":1578}," ()",[1557,2436,1589],{"class":1578},[1557,2438,2439,2441,2443,2445,2447,2449,2452,2454,2456],{"class":1559,"line":1628},[1557,2440,1833],{"class":1612},[1557,2442,1775],{"class":1578},[1557,2444,1778],{"class":1574},[1557,2446,1579],{"class":1840},[1557,2448,1606],{"class":1578},[1557,2450,2451],{"class":1602},"Hi",[1557,2453,1606],{"class":1578},[1557,2455,1586],{"class":1840},[1557,2457,1625],{"class":1578},[1557,2459,2460],{"class":1559,"line":1634},[1557,2461,1699],{"class":1578},[1534,2463],{},[1525,2465,2467],{"id":2466},"小提示函数默认参数模拟","💡 小提示：函数默认参数模拟",[1530,2469,2470],{},"在 JavaScript 中，如果函数调用时没有传入某个参数，它的值会是 undefined。可以通过在函数内部手动检查参数是否传入，并设置默认值：",[1547,2472,2474],{"className":1549,"code":2473,"language":1551,"meta":1552,"style":1552},"function greet(name) {\n    if (typeof name === 'undefined') {\n        name = '朋友';\n    }\n    return '你好，' + name + '！';\n}\n",[1554,2475,2476,2490,2517,2533,2538,2562],{"__ignoreMap":1552},[1557,2477,2478,2480,2482,2484,2486,2488],{"class":1559,"line":1560},[1557,2479,1571],{"class":1570},[1557,2481,1575],{"class":1574},[1557,2483,1579],{"class":1578},[1557,2485,1583],{"class":1582},[1557,2487,1586],{"class":1578},[1557,2489,1589],{"class":1578},[1557,2491,2492,2495,2497,2500,2502,2505,2507,2509,2511,2514],{"class":1559,"line":1567},[1557,2493,2494],{"class":1595},"    if",[1557,2496,1662],{"class":1840},[1557,2498,2499],{"class":1578},"typeof",[1557,2501,1613],{"class":1612},[1557,2503,2504],{"class":1578}," ===",[1557,2506,1599],{"class":1578},[1557,2508,1807],{"class":1602},[1557,2510,1606],{"class":1578},[1557,2512,2513],{"class":1840},") ",[1557,2515,2516],{"class":1578},"{\n",[1557,2518,2519,2522,2524,2526,2529,2531],{"class":1559,"line":1592},[1557,2520,2521],{"class":1612},"        name",[1557,2523,1900],{"class":1578},[1557,2525,1599],{"class":1578},[1557,2527,2528],{"class":1602},"朋友",[1557,2530,1606],{"class":1578},[1557,2532,1625],{"class":1578},[1557,2534,2535],{"class":1559,"line":1628},[1557,2536,2537],{"class":1578},"    }\n",[1557,2539,2540,2542,2544,2546,2548,2550,2552,2554,2556,2558,2560],{"class":1559,"line":1634},[1557,2541,1596],{"class":1595},[1557,2543,1599],{"class":1578},[1557,2545,1603],{"class":1602},[1557,2547,1606],{"class":1578},[1557,2549,1609],{"class":1578},[1557,2551,1613],{"class":1612},[1557,2553,1609],{"class":1578},[1557,2555,1599],{"class":1578},[1557,2557,1620],{"class":1602},[1557,2559,1606],{"class":1578},[1557,2561,1625],{"class":1578},[1557,2563,2564],{"class":1559,"line":1641},[1557,2565,1631],{"class":1578},[1534,2567],{},[1525,2569,2571],{"id":2570},"小节总结","🧾 小节总结",[1975,2573,2574,2577,2580],{},[1978,2575,2576],{},"JS 函数是封装可复用代码的基本单位，理解函数声明、调用、参数传递很关键。",[1978,2578,2579],{},"函数作用域保护变量，闭包让函数“记住”外部变量，是解决复杂业务的利器。",[1978,2581,2582],{},"注意函数声明和函数表达式的提升差异，合理利用默认参数和闭包提高代码质量。",[1534,2584],{},[1525,2586,2588],{"id":2587},"知识问答qa","❓ 知识问答（Q&A）",[1530,2590,2591,2592,2595],{},"Q：函数表达式和函数声明有什么区别？",[2593,2594],"br",{},"\nA：函数声明会被提升，可以先调用后声明；函数表达式不会提升，必须先定义后调用。",[1530,2597,2598,2599,2601],{},"Q：闭包是什么，有什么作用？",[2593,2600],{},"\nA：闭包是函数“记住”定义时的外部变量。它能让函数访问并操作外部函数的局部变量，常用于数据缓存和私有变量。",[1534,2603],{},[1525,2605,2607],{"id":2606},"小练习","🧪 小练习",[1530,2609,2610],{},"练习1：写一个函数，接收两个参数，返回它们的乘积。调用这个函数并打印结果。",[1547,2612,2614],{"className":1549,"code":2613,"language":1551,"meta":1552,"style":1552},"function multiply(a, b) {\n    // 实现代码\n}\n\nconsole.log(multiply(3, 5)); // 期望输出 15\n",[1554,2615,2616,2637,2642,2646,2650],{"__ignoreMap":1552},[1557,2617,2618,2620,2623,2625,2628,2630,2633,2635],{"class":1559,"line":1560},[1557,2619,1571],{"class":1570},[1557,2621,2622],{"class":1574}," multiply",[1557,2624,1579],{"class":1578},[1557,2626,2627],{"class":1582},"a",[1557,2629,2254],{"class":1578},[1557,2631,2632],{"class":1582}," b",[1557,2634,1586],{"class":1578},[1557,2636,1589],{"class":1578},[1557,2638,2639],{"class":1559,"line":1567},[1557,2640,2641],{"class":1563},"    // 实现代码\n",[1557,2643,2644],{"class":1559,"line":1592},[1557,2645,1631],{"class":1578},[1557,2647,2648],{"class":1559,"line":1628},[1557,2649,1638],{"emptyLinePlaceholder":1637},[1557,2651,2652,2654,2656,2658,2660,2663,2665,2668,2670,2673,2675,2677],{"class":1559,"line":1634},[1557,2653,1772],{"class":1612},[1557,2655,1775],{"class":1578},[1557,2657,1778],{"class":1574},[1557,2659,1579],{"class":1612},[1557,2661,2662],{"class":1574},"multiply",[1557,2664,1579],{"class":1612},[1557,2666,2667],{"class":2024},"3",[1557,2669,2254],{"class":1578},[1557,2671,2672],{"class":2024}," 5",[1557,2674,1795],{"class":1612},[1557,2676,1953],{"class":1578},[1557,2678,2679],{"class":1563}," // 期望输出 15\n",[1530,2681,2682],{},"练习2：利用闭包写一个计数器函数，调用它每次数字加 1，并返回当前计数。",[1547,2684,2686],{"className":1549,"code":2685,"language":1551,"meta":1552,"style":1552},"function createCounter() {\n    // 返回一个内部函数，实现计数功能\n}\n\nconst counter = createCounter();\n\nconsole.log(counter()); // 1\nconsole.log(counter()); // 2\n",[1554,2687,2688,2699,2704,2708,2712,2726,2730,2750],{"__ignoreMap":1552},[1557,2689,2690,2692,2695,2697],{"class":1559,"line":1560},[1557,2691,1571],{"class":1570},[1557,2693,2694],{"class":1574}," createCounter",[1557,2696,1826],{"class":1578},[1557,2698,1589],{"class":1578},[1557,2700,2701],{"class":1559,"line":1567},[1557,2702,2703],{"class":1563},"    // 返回一个内部函数，实现计数功能\n",[1557,2705,2706],{"class":1559,"line":1592},[1557,2707,1631],{"class":1578},[1557,2709,2710],{"class":1559,"line":1628},[1557,2711,1638],{"emptyLinePlaceholder":1637},[1557,2713,2714,2716,2718,2720,2722,2724],{"class":1559,"line":1634},[1557,2715,1650],{"class":1570},[1557,2717,2280],{"class":1612},[1557,2719,1656],{"class":1578},[1557,2721,2694],{"class":1574},[1557,2723,1826],{"class":1612},[1557,2725,1625],{"class":1578},[1557,2727,2728],{"class":1559,"line":1641},[1557,2729,1638],{"emptyLinePlaceholder":1637},[1557,2731,2732,2734,2736,2738,2740,2742,2745,2747],{"class":1559,"line":1647},[1557,2733,1772],{"class":1612},[1557,2735,1775],{"class":1578},[1557,2737,1778],{"class":1574},[1557,2739,1579],{"class":1612},[1557,2741,2293],{"class":1574},[1557,2743,2744],{"class":1612},"())",[1557,2746,1953],{"class":1578},[1557,2748,2749],{"class":1563}," // 1\n",[1557,2751,2752,2754,2756,2758,2760,2762,2764,2766],{"class":1559,"line":1671},[1557,2753,1772],{"class":1612},[1557,2755,1775],{"class":1578},[1557,2757,1778],{"class":1574},[1557,2759,1579],{"class":1612},[1557,2761,2293],{"class":1574},[1557,2763,2744],{"class":1612},[1557,2765,1953],{"class":1578},[1557,2767,2768],{"class":1563}," // 2\n",[1534,2770],{},[1530,2772,2773],{},"🎉 恭喜你已经掌握 JS 函数的声明、调用、作用域、参数传递和闭包等核心技能啦！祝你前端学习之路顺利！",[2775,2776,2777],"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 .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 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函数的用法、原理与细节，帮助前端小白真正理解函数的本质。","md",null,{},{"title":174},{"title":174,"description":2791},"ZNHHFbuRru",[2799,2801],{"title":170,"path":171,"stem":172,"description":2800,"children":-1},"探索 JavaScript 中条件判断与循环的核心语法与用法，助你轻松驾驭流程控制。",{"title":178,"path":179,"stem":180,"description":2802,"children":-1},"本文深入浅出地讲解 JavaScript 中对象和数组的常用操作，帮助前端入门小白掌握基础技能。",1784715106229]