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true",[1616,1696,1697],{"class":1630},";",[1616,1699,1701],{"class":1700},"syuKq"," // 模拟操作结果\n",[1616,1703,1705,1709,1712,1715,1718],{"class":1618,"line":1704},4,[1616,1706,1708],{"class":1707},"s8pZq","        if",[1616,1710,1711],{"class":1671}," (",[1616,1713,1714],{"class":1626},"success",[1616,1716,1717],{"class":1671},") ",[1616,1719,1720],{"class":1630},"{\n",[1616,1722,1724,1727,1729,1732,1736,1738,1740],{"class":1618,"line":1723},5,[1616,1725,1726],{"class":1667},"            resolve",[1616,1728,1641],{"class":1671},[1616,1730,1731],{"class":1630},"'",[1616,1733,1735],{"class":1734},"sIEYB","操作成功！",[1616,1737,1731],{"class":1630},[1616,1739,1655],{"class":1671},[1616,1741,1742],{"class":1630},";\n",[1616,1744,1746,1749,1752],{"class":1618,"line":1745},6,[1616,1747,1748],{"class":1630},"        }",[1616,1750,1751],{"class":1707}," else",[1616,1753,1661],{"class":1630},[1616,1755,1757,1760,1762,1764,1767,1769,1771],{"class":1618,"line":1756},7,[1616,1758,1759],{"class":1667},"            reject",[1616,1761,1641],{"class":1671},[1616,1763,1731],{"class":1630},[1616,1765,1766],{"class":1734},"操作失败！",[1616,1768,1731],{"class":1630},[1616,1770,1655],{"class":1671},[1616,1772,1742],{"class":1630},[1616,1774,1776],{"class":1618,"line":1775},8,[1616,1777,1778],{"class":1630},"        }\n",[1616,1780,1782,1785,1789,1791],{"class":1618,"line":1781},9,[1616,1783,1784],{"class":1630},"    },",[1616,1786,1788],{"class":1787},"smPcV"," 1000",[1616,1790,1655],{"class":1671},[1616,1792,1742],{"class":1630},[1616,1794,1796,1799,1801],{"class":1618,"line":1795},10,[1616,1797,1798],{"class":1630},"}",[1616,1800,1655],{"class":1626},[1616,1802,1742],{"class":1630},[1530,1804,1805],{},"上面代码表示：等待 1 秒后，告诉 Promise 结果是成功还是失败。",[1546,1807],{},[1525,1809,1811],{"id":1810},"️-thencatchfinally-怎么用","⚡️ .then()、.catch()、.finally() 怎么用？",[1813,1814,1815,1821,1826],"ul",{},[1816,1817,1818,1820],"li",{},[1534,1819,1536],{},"：当 Promise 成功时执行，接收成功的结果。",[1816,1822,1823,1825],{},[1534,1824,1540],{},"：当 Promise 失败时执行，接收失败的原因。",[1816,1827,1828,1830],{},[1534,1829,1543],{},"：不管成功还是失败，都会执行，可以用来做收尾工作，比如关闭加载动画。",[1607,1832,1834],{"className":1609,"code":1833,"language":1611,"meta":1612,"style":1612},"myPromise\n    .then(result => {\n        console.log('成功回调:', result);\n    })\n    .catch(error => {\n        console.error('失败回调:', error);\n    })\n    .finally(() => {\n        console.log('无论成功失败都会执行');\n    });\n",[1534,1835,1836,1841,1858,1887,1895,1911,1937,1943,1958,1979],{"__ignoreMap":1612},[1616,1837,1838],{"class":1618,"line":1619},[1616,1839,1840],{"class":1626},"myPromise\n",[1616,1842,1843,1846,1849,1851,1854,1856],{"class":1618,"line":1664},[1616,1844,1845],{"class":1630},"    .",[1616,1847,1848],{"class":1667},"then",[1616,1850,1641],{"class":1626},[1616,1852,1853],{"class":1646},"result",[1616,1855,1658],{"class":1622},[1616,1857,1661],{"class":1630},[1616,1859,1860,1863,1866,1869,1871,1873,1876,1878,1880,1883,1885],{"class":1618,"line":1681},[1616,1861,1862],{"class":1626},"        console",[1616,1864,1865],{"class":1630},".",[1616,1867,1868],{"class":1667},"log",[1616,1870,1641],{"class":1671},[1616,1872,1731],{"class":1630},[1616,1874,1875],{"class":1734},"成功回调:",[1616,1877,1731],{"class":1630},[1616,1879,1649],{"class":1630},[1616,1881,1882],{"class":1626}," result",[1616,1884,1655],{"class":1671},[1616,1886,1742],{"class":1630},[1616,1888,1889,1892],{"class":1618,"line":1704},[1616,1890,1891],{"class":1630},"    }",[1616,1893,1894],{"class":1626},")\n",[1616,1896,1897,1899,1902,1904,1907,1909],{"class":1618,"line":1723},[1616,1898,1845],{"class":1630},[1616,1900,1901],{"class":1667},"catch",[1616,1903,1641],{"class":1626},[1616,1905,1906],{"class":1646},"error",[1616,1908,1658],{"class":1622},[1616,1910,1661],{"class":1630},[1616,1912,1913,1915,1917,1919,1921,1923,1926,1928,1930,1933,1935],{"class":1618,"line":1745},[1616,1914,1862],{"class":1626},[1616,1916,1865],{"class":1630},[1616,1918,1906],{"class":1667},[1616,1920,1641],{"class":1671},[1616,1922,1731],{"class":1630},[1616,1924,1925],{"class":1734},"失败回调:",[1616,1927,1731],{"class":1630},[1616,1929,1649],{"class":1630},[1616,1931,1932],{"class":1626}," error",[1616,1934,1655],{"class":1671},[1616,1936,1742],{"class":1630},[1616,1938,1939,1941],{"class":1618,"line":1756},[1616,1940,1891],{"class":1630},[1616,1942,1894],{"class":1626},[1616,1944,1945,1947,1950,1952,1954,1956],{"class":1618,"line":1775},[1616,1946,1845],{"class":1630},[1616,1948,1949],{"class":1667},"finally",[1616,1951,1641],{"class":1626},[1616,1953,1674],{"class":1630},[1616,1955,1658],{"class":1622},[1616,1957,1661],{"class":1630},[1616,1959,1960,1962,1964,1966,1968,1970,1973,1975,1977],{"class":1618,"line":1781},[1616,1961,1862],{"class":1626},[1616,1963,1865],{"class":1630},[1616,1965,1868],{"class":1667},[1616,1967,1641],{"class":1671},[1616,1969,1731],{"class":1630},[1616,1971,1972],{"class":1734},"无论成功失败都会执行",[1616,1974,1731],{"class":1630},[1616,1976,1655],{"class":1671},[1616,1978,1742],{"class":1630},[1616,1980,1981,1983,1985],{"class":1618,"line":1795},[1616,1982,1891],{"class":1630},[1616,1984,1655],{"class":1626},[1616,1986,1742],{"class":1630},[1546,1988],{},[1525,1990,1992],{"id":1991},"promise-链式调用","🔗 Promise 链式调用",[1530,1994,1995],{},"Promise 的强大之处还在于它支持链式调用。你可以把多个异步操作一个接一个地写出来，不用陷入回调层层嵌套。",[1607,1997,1999],{"className":1609,"code":1998,"language":1611,"meta":1612,"style":1612},"new Promise((resolve, reject) => {\n    setTimeout(() => resolve(1), 500); // 第一步，返回数字 1\n})\n    .then(result => {\n        console.log(result); // 1\n        return result * 2;\n    })\n    .then(result => {\n        console.log(result); // 2\n        return result * 3;\n    })\n    .then(result => {\n        console.log(result); // 6\n    });\n",[1534,2000,2001,2024,2056,2062,2076,2095,2110,2116,2130,2149,2162,2169,2184,2204],{"__ignoreMap":1612},[1616,2002,2003,2006,2008,2010,2012,2014,2016,2018,2020,2022],{"class":1618,"line":1619},[1616,2004,2005],{"class":1630},"new",[1616,2007,1638],{"class":1637},[1616,2009,1641],{"class":1626},[1616,2011,1641],{"class":1630},[1616,2013,1594],{"class":1646},[1616,2015,1649],{"class":1630},[1616,2017,1652],{"class":1646},[1616,2019,1655],{"class":1630},[1616,2021,1658],{"class":1622},[1616,2023,1661],{"class":1630},[1616,2025,2026,2028,2030,2032,2034,2037,2039,2042,2044,2046,2049,2051,2053],{"class":1618,"line":1664},[1616,2027,1668],{"class":1667},[1616,2029,1641],{"class":1671},[1616,2031,1674],{"class":1630},[1616,2033,1658],{"class":1622},[1616,2035,2036],{"class":1667}," resolve",[1616,2038,1641],{"class":1671},[1616,2040,2041],{"class":1787},"1",[1616,2043,1655],{"class":1671},[1616,2045,1649],{"class":1630},[1616,2047,2048],{"class":1787}," 500",[1616,2050,1655],{"class":1671},[1616,2052,1697],{"class":1630},[1616,2054,2055],{"class":1700}," // 第一步，返回数字 1\n",[1616,2057,2058,2060],{"class":1618,"line":1681},[1616,2059,1798],{"class":1630},[1616,2061,1894],{"class":1626},[1616,2063,2064,2066,2068,2070,2072,2074],{"class":1618,"line":1704},[1616,2065,1845],{"class":1630},[1616,2067,1848],{"class":1667},[1616,2069,1641],{"class":1626},[1616,2071,1853],{"class":1646},[1616,2073,1658],{"class":1622},[1616,2075,1661],{"class":1630},[1616,2077,2078,2080,2082,2084,2086,2088,2090,2092],{"class":1618,"line":1723},[1616,2079,1862],{"class":1626},[1616,2081,1865],{"class":1630},[1616,2083,1868],{"class":1667},[1616,2085,1641],{"class":1671},[1616,2087,1853],{"class":1626},[1616,2089,1655],{"class":1671},[1616,2091,1697],{"class":1630},[1616,2093,2094],{"class":1700}," // 1\n",[1616,2096,2097,2100,2102,2105,2108],{"class":1618,"line":1745},[1616,2098,2099],{"class":1707},"        return",[1616,2101,1882],{"class":1626},[1616,2103,2104],{"class":1630}," *",[1616,2106,2107],{"class":1787}," 2",[1616,2109,1742],{"class":1630},[1616,2111,2112,2114],{"class":1618,"line":1756},[1616,2113,1891],{"class":1630},[1616,2115,1894],{"class":1626},[1616,2117,2118,2120,2122,2124,2126,2128],{"class":1618,"line":1775},[1616,2119,1845],{"class":1630},[1616,2121,1848],{"class":1667},[1616,2123,1641],{"class":1626},[1616,2125,1853],{"class":1646},[1616,2127,1658],{"class":1622},[1616,2129,1661],{"class":1630},[1616,2131,2132,2134,2136,2138,2140,2142,2144,2146],{"class":1618,"line":1781},[1616,2133,1862],{"class":1626},[1616,2135,1865],{"class":1630},[1616,2137,1868],{"class":1667},[1616,2139,1641],{"class":1671},[1616,2141,1853],{"class":1626},[1616,2143,1655],{"class":1671},[1616,2145,1697],{"class":1630},[1616,2147,2148],{"class":1700}," // 2\n",[1616,2150,2151,2153,2155,2157,2160],{"class":1618,"line":1795},[1616,2152,2099],{"class":1707},[1616,2154,1882],{"class":1626},[1616,2156,2104],{"class":1630},[1616,2158,2159],{"class":1787}," 3",[1616,2161,1742],{"class":1630},[1616,2163,2165,2167],{"class":1618,"line":2164},11,[1616,2166,1891],{"class":1630},[1616,2168,1894],{"class":1626},[1616,2170,2172,2174,2176,2178,2180,2182],{"class":1618,"line":2171},12,[1616,2173,1845],{"class":1630},[1616,2175,1848],{"class":1667},[1616,2177,1641],{"class":1626},[1616,2179,1853],{"class":1646},[1616,2181,1658],{"class":1622},[1616,2183,1661],{"class":1630},[1616,2185,2187,2189,2191,2193,2195,2197,2199,2201],{"class":1618,"line":2186},13,[1616,2188,1862],{"class":1626},[1616,2190,1865],{"class":1630},[1616,2192,1868],{"class":1667},[1616,2194,1641],{"class":1671},[1616,2196,1853],{"class":1626},[1616,2198,1655],{"class":1671},[1616,2200,1697],{"class":1630},[1616,2202,2203],{"class":1700}," // 6\n",[1616,2205,2207,2209,2211],{"class":1618,"line":2206},14,[1616,2208,1891],{"class":1630},[1616,2210,1655],{"class":1626},[1616,2212,1742],{"class":1630},[1530,2214,2215],{},"链式调用的神奇之处在于：",[1813,2217,2218,2225],{},[1816,2219,2220,2221,2224],{},"每个 ",[1534,2222,2223],{},".then"," 都会返回一个新的 Promise，允许后续继续操作",[1816,2226,2227,2228,2230],{},"传递的结果会自动成为下一个 ",[1534,2229,2223],{}," 的输入",[1546,2232],{},[1525,2234,2236],{"id":2235},"️-回调地狱的问题","⚠️ 回调地狱的问题",[1530,2238,2239],{},"在 Promise 出现之前，异步操作常用回调函数实现，但很容易陷入“回调地狱”，代码非常难读，维护也不方便。",[1530,2241,2242],{},"示例：",[1607,2244,2246],{"className":1609,"code":2245,"language":1611,"meta":1612,"style":1612},"getData(function (a) {\n    getMoreData(a, function (b) {\n        getEvenMoreData(b, function (c) {\n            // 一层层嵌套，代码越来越深\n        });\n    });\n});\n",[1534,2247,2248,2267,2290,2312,2317,2325,2333],{"__ignoreMap":1612},[1616,2249,2250,2253,2255,2258,2260,2263,2265],{"class":1618,"line":1619},[1616,2251,2252],{"class":1667},"getData",[1616,2254,1641],{"class":1626},[1616,2256,2257],{"class":1622},"function",[1616,2259,1711],{"class":1630},[1616,2261,2262],{"class":1646},"a",[1616,2264,1655],{"class":1630},[1616,2266,1661],{"class":1630},[1616,2268,2269,2272,2274,2276,2278,2281,2283,2286,2288],{"class":1618,"line":1664},[1616,2270,2271],{"class":1667},"    getMoreData",[1616,2273,1641],{"class":1671},[1616,2275,2262],{"class":1626},[1616,2277,1649],{"class":1630},[1616,2279,2280],{"class":1622}," function",[1616,2282,1711],{"class":1630},[1616,2284,2285],{"class":1646},"b",[1616,2287,1655],{"class":1630},[1616,2289,1661],{"class":1630},[1616,2291,2292,2295,2297,2299,2301,2303,2305,2308,2310],{"class":1618,"line":1681},[1616,2293,2294],{"class":1667},"        getEvenMoreData",[1616,2296,1641],{"class":1671},[1616,2298,2285],{"class":1626},[1616,2300,1649],{"class":1630},[1616,2302,2280],{"class":1622},[1616,2304,1711],{"class":1630},[1616,2306,2307],{"class":1646},"c",[1616,2309,1655],{"class":1630},[1616,2311,1661],{"class":1630},[1616,2313,2314],{"class":1618,"line":1704},[1616,2315,2316],{"class":1700},"            // 一层层嵌套，代码越来越深\n",[1616,2318,2319,2321,2323],{"class":1618,"line":1723},[1616,2320,1748],{"class":1630},[1616,2322,1655],{"class":1671},[1616,2324,1742],{"class":1630},[1616,2326,2327,2329,2331],{"class":1618,"line":1745},[1616,2328,1891],{"class":1630},[1616,2330,1655],{"class":1671},[1616,2332,1742],{"class":1630},[1616,2334,2335,2337,2339],{"class":1618,"line":1756},[1616,2336,1798],{"class":1630},[1616,2338,1655],{"class":1626},[1616,2340,1742],{"class":1630},[1530,2342,2343],{},"当异步操作过多时，代码像金字塔一样往里缩，难以理解和维护。",[1530,2345,2346],{},"Promise 通过链式调用，解决了回调地狱的问题，但链式写法有时候仍然不够直观。",[1546,2348],{},[1525,2350,2352],{"id":2351},"什么是-asyncawait解决了什么问题","🚀 什么是 async/await？解决了什么问题？",[1530,2354,2355,2358,2359,2362],{},[1534,2356,2357],{},"async"," / ",[1534,2360,2361],{},"await"," 是 ES2017 引入的语法糖，基于 Promise，它让异步代码看起来像同步代码，更加简洁直观。",[1530,2364,2365,2366,2368,2369,2371],{},"你可以用 ",[1534,2367,2361],{}," 关键字“等待”一个 Promise 完成，然后拿到结果，无需写 ",[1534,2370,1536],{},"。",[1530,2373,2374],{},"举个例子：",[1607,2376,2378],{"className":1609,"code":2377,"language":1611,"meta":1612,"style":1612},"async function fetchData() {\n    const result = await myPromise; // 等待 Promise 完成\n    console.log(result);\n}\n",[1534,2379,2380,2393,2413,2430],{"__ignoreMap":1612},[1616,2381,2382,2384,2386,2389,2391],{"class":1618,"line":1619},[1616,2383,2357],{"class":1622},[1616,2385,2280],{"class":1622},[1616,2387,2388],{"class":1667}," fetchData",[1616,2390,1674],{"class":1630},[1616,2392,1661],{"class":1630},[1616,2394,2395,2398,2400,2402,2405,2408,2410],{"class":1618,"line":1664},[1616,2396,2397],{"class":1622},"    const",[1616,2399,1882],{"class":1626},[1616,2401,1690],{"class":1630},[1616,2403,2404],{"class":1707}," await",[1616,2406,2407],{"class":1626}," myPromise",[1616,2409,1697],{"class":1630},[1616,2411,2412],{"class":1700}," // 等待 Promise 完成\n",[1616,2414,2415,2418,2420,2422,2424,2426,2428],{"class":1618,"line":1681},[1616,2416,2417],{"class":1626},"    console",[1616,2419,1865],{"class":1630},[1616,2421,1868],{"class":1667},[1616,2423,1641],{"class":1671},[1616,2425,1853],{"class":1626},[1616,2427,1655],{"class":1671},[1616,2429,1742],{"class":1630},[1616,2431,2432],{"class":1618,"line":1704},[1616,2433,2434],{"class":1630},"}\n",[1578,2436,2437],{},[1530,2438,2439,2440,2442,2443,2445],{},"在使用 ",[1534,2441,2361],{}," 时候，记得检查函数前面是否添加 ",[1534,2444,2357],{},"，否则会报错哦！",[1530,2447,2448],{},"这样写最大的好处是：",[1813,2450,2451,2454,2461],{},[1816,2452,2453],{},"代码更平铺直叙，逻辑清晰",[1816,2455,2456,2457,2460],{},"错误处理用 ",[1534,2458,2459],{},"try...catch","，结构更规范",[1816,2462,2463],{},"减少了回调和链式调用的复杂度",[1546,2465],{},[1525,2467,2469],{"id":2468},"asyncawait-如何使用","🛠 async/await 如何使用？",[1530,2471,2472],{},"使用 async/await 主要步骤：",[2474,2475,2476,2482,2488],"ol",{},[1816,2477,2478,2479,2481],{},"在函数前加 ",[1534,2480,2357],{},"，表示这个函数是异步函数，返回一个 Promise。",[1816,2483,2484,2485,2487],{},"在异步操作前加 ",[1534,2486,2361],{},"，暂停执行，等待操作完成。",[1816,2489,2490,2491,2493],{},"用 ",[1534,2492,2459],{}," 捕获异常，处理失败情况。",[1530,2495,2242],{},[1607,2497,2499],{"className":1609,"code":2498,"language":1611,"meta":1612,"style":1612},"function delay(ms) {\n    return new Promise(resolve => setTimeout(resolve, ms));\n}\n\nasync function doTasks() {\n    try {\n        console.log('开始任务');\n        await delay(1000); // 等待 1 秒\n        console.log('任务 1 完成');\n\n        await delay(1000);\n        console.log('任务 2 完成');\n\n        return '全部任务完成';\n    } catch (error) {\n        console.error('任务失败:', error);\n    }\n}\n\ndoTasks().then(result => console.log(result));\n",[1534,2500,2501,2517,2549,2553,2559,2572,2579,2600,2619,2640,2644,2658,2679,2683,2697,2713,2739,2745,2750,2755],{"__ignoreMap":1612},[1616,2502,2503,2505,2508,2510,2513,2515],{"class":1618,"line":1619},[1616,2504,2257],{"class":1622},[1616,2506,2507],{"class":1667}," delay",[1616,2509,1641],{"class":1630},[1616,2511,2512],{"class":1646},"ms",[1616,2514,1655],{"class":1630},[1616,2516,1661],{"class":1630},[1616,2518,2519,2522,2524,2526,2528,2530,2532,2535,2537,2539,2541,2544,2547],{"class":1618,"line":1664},[1616,2520,2521],{"class":1707},"    return",[1616,2523,1634],{"class":1630},[1616,2525,1638],{"class":1637},[1616,2527,1641],{"class":1671},[1616,2529,1594],{"class":1646},[1616,2531,1658],{"class":1622},[1616,2533,2534],{"class":1667}," setTimeout",[1616,2536,1641],{"class":1671},[1616,2538,1594],{"class":1626},[1616,2540,1649],{"class":1630},[1616,2542,2543],{"class":1626}," ms",[1616,2545,2546],{"class":1671},"))",[1616,2548,1742],{"class":1630},[1616,2550,2551],{"class":1618,"line":1681},[1616,2552,2434],{"class":1630},[1616,2554,2555],{"class":1618,"line":1704},[1616,2556,2558],{"emptyLinePlaceholder":2557},true,"\n",[1616,2560,2561,2563,2565,2568,2570],{"class":1618,"line":1723},[1616,2562,2357],{"class":1622},[1616,2564,2280],{"class":1622},[1616,2566,2567],{"class":1667}," doTasks",[1616,2569,1674],{"class":1630},[1616,2571,1661],{"class":1630},[1616,2573,2574,2577],{"class":1618,"line":1745},[1616,2575,2576],{"class":1707},"    try",[1616,2578,1661],{"class":1630},[1616,2580,2581,2583,2585,2587,2589,2591,2594,2596,2598],{"class":1618,"line":1756},[1616,2582,1862],{"class":1626},[1616,2584,1865],{"class":1630},[1616,2586,1868],{"class":1667},[1616,2588,1641],{"class":1671},[1616,2590,1731],{"class":1630},[1616,2592,2593],{"class":1734},"开始任务",[1616,2595,1731],{"class":1630},[1616,2597,1655],{"class":1671},[1616,2599,1742],{"class":1630},[1616,2601,2602,2605,2607,2609,2612,2614,2616],{"class":1618,"line":1775},[1616,2603,2604],{"class":1707},"        await",[1616,2606,2507],{"class":1667},[1616,2608,1641],{"class":1671},[1616,2610,2611],{"class":1787},"1000",[1616,2613,1655],{"class":1671},[1616,2615,1697],{"class":1630},[1616,2617,2618],{"class":1700}," // 等待 1 秒\n",[1616,2620,2621,2623,2625,2627,2629,2631,2634,2636,2638],{"class":1618,"line":1781},[1616,2622,1862],{"class":1626},[1616,2624,1865],{"class":1630},[1616,2626,1868],{"class":1667},[1616,2628,1641],{"class":1671},[1616,2630,1731],{"class":1630},[1616,2632,2633],{"class":1734},"任务 1 完成",[1616,2635,1731],{"class":1630},[1616,2637,1655],{"class":1671},[1616,2639,1742],{"class":1630},[1616,2641,2642],{"class":1618,"line":1795},[1616,2643,2558],{"emptyLinePlaceholder":2557},[1616,2645,2646,2648,2650,2652,2654,2656],{"class":1618,"line":2164},[1616,2647,2604],{"class":1707},[1616,2649,2507],{"class":1667},[1616,2651,1641],{"class":1671},[1616,2653,2611],{"class":1787},[1616,2655,1655],{"class":1671},[1616,2657,1742],{"class":1630},[1616,2659,2660,2662,2664,2666,2668,2670,2673,2675,2677],{"class":1618,"line":2171},[1616,2661,1862],{"class":1626},[1616,2663,1865],{"class":1630},[1616,2665,1868],{"class":1667},[1616,2667,1641],{"class":1671},[1616,2669,1731],{"class":1630},[1616,2671,2672],{"class":1734},"任务 2 完成",[1616,2674,1731],{"class":1630},[1616,2676,1655],{"class":1671},[1616,2678,1742],{"class":1630},[1616,2680,2681],{"class":1618,"line":2186},[1616,2682,2558],{"emptyLinePlaceholder":2557},[1616,2684,2685,2687,2690,2693,2695],{"class":1618,"line":2206},[1616,2686,2099],{"class":1707},[1616,2688,2689],{"class":1630}," '",[1616,2691,2692],{"class":1734},"全部任务完成",[1616,2694,1731],{"class":1630},[1616,2696,1742],{"class":1630},[1616,2698,2700,2702,2705,2707,2709,2711],{"class":1618,"line":2699},15,[1616,2701,1891],{"class":1630},[1616,2703,2704],{"class":1707}," catch",[1616,2706,1711],{"class":1671},[1616,2708,1906],{"class":1626},[1616,2710,1717],{"class":1671},[1616,2712,1720],{"class":1630},[1616,2714,2716,2718,2720,2722,2724,2726,2729,2731,2733,2735,2737],{"class":1618,"line":2715},16,[1616,2717,1862],{"class":1626},[1616,2719,1865],{"class":1630},[1616,2721,1906],{"class":1667},[1616,2723,1641],{"class":1671},[1616,2725,1731],{"class":1630},[1616,2727,2728],{"class":1734},"任务失败:",[1616,2730,1731],{"class":1630},[1616,2732,1649],{"class":1630},[1616,2734,1932],{"class":1626},[1616,2736,1655],{"class":1671},[1616,2738,1742],{"class":1630},[1616,2740,2742],{"class":1618,"line":2741},17,[1616,2743,2744],{"class":1630},"    }\n",[1616,2746,2748],{"class":1618,"line":2747},18,[1616,2749,2434],{"class":1630},[1616,2751,2753],{"class":1618,"line":2752},19,[1616,2754,2558],{"emptyLinePlaceholder":2557},[1616,2756,2758,2761,2763,2765,2767,2769,2771,2773,2776,2778,2780,2783],{"class":1618,"line":2757},20,[1616,2759,2760],{"class":1667},"doTasks",[1616,2762,1674],{"class":1626},[1616,2764,1865],{"class":1630},[1616,2766,1848],{"class":1667},[1616,2768,1641],{"class":1626},[1616,2770,1853],{"class":1646},[1616,2772,1658],{"class":1622},[1616,2774,2775],{"class":1626}," console",[1616,2777,1865],{"class":1630},[1616,2779,1868],{"class":1667},[1616,2781,2782],{"class":1626},"(result))",[1616,2784,1742],{"class":1630},[1530,2786,2787,2788,2791],{},"这里我们用 ",[1534,2789,2790],{},"delay"," 模拟异步等待，代码顺序执行，阅读体验像写同步代码一样。",[1546,2793],{},[1578,2795,2796,2807],{},[1530,2797,2798,2799,2802,2803,2806],{},"当你在使用 async/await 时，如果有多个相互独立的异步操作，可以通过 ",[1534,2800,2801],{},"Promise.all"," 并发执行，提高性能。",[2804,2805],"br",{},"\n示例：",[1607,2808,2810],{"className":1609,"code":2809,"language":1611,"meta":1612,"style":1612},"async function fetchAll() {\n    const [a, b] = await Promise.all([fetchA(), fetchB()]);\n}\n",[1534,2811,2812,2825,2871],{"__ignoreMap":1612},[1616,2813,2814,2816,2818,2821,2823],{"class":1618,"line":1619},[1616,2815,2357],{"class":1622},[1616,2817,2280],{"class":1622},[1616,2819,2820],{"class":1667}," fetchAll",[1616,2822,1674],{"class":1630},[1616,2824,1661],{"class":1630},[1616,2826,2827,2829,2832,2834,2836,2839,2842,2844,2846,2848,2850,2853,2856,2859,2861,2863,2866,2869],{"class":1618,"line":1664},[1616,2828,2397],{"class":1622},[1616,2830,2831],{"class":1630}," [",[1616,2833,2262],{"class":1626},[1616,2835,1649],{"class":1630},[1616,2837,2838],{"class":1626}," b",[1616,2840,2841],{"class":1630},"]",[1616,2843,1690],{"class":1630},[1616,2845,2404],{"class":1707},[1616,2847,1638],{"class":1637},[1616,2849,1865],{"class":1630},[1616,2851,2852],{"class":1667},"all",[1616,2854,2855],{"class":1671},"([",[1616,2857,2858],{"class":1667},"fetchA",[1616,2860,1674],{"class":1671},[1616,2862,1649],{"class":1630},[1616,2864,2865],{"class":1667}," fetchB",[1616,2867,2868],{"class":1671},"()])",[1616,2870,1742],{"class":1630},[1616,2872,2873],{"class":1618,"line":1681},[1616,2874,2434],{"class":1630},[1546,2876],{},[1525,2878,2880],{"id":2879},"小节总结","🧾 小节总结",[1813,2882,2883,2886,2896],{},[1816,2884,2885],{},"Promise 是异步编程的基础，代表一个未来的操作结果，有三种状态。",[1816,2887,2888,2890,2891,2890,2893,2895],{},[1534,2889,1536],{},", ",[1534,2892,1540],{},[1534,2894,1543],{}," 是 Promise 的常用处理方法，支持链式调用，解决了回调地狱部分问题。",[1816,2897,2898],{},"async/await 是语法糖，让异步代码更像同步代码，写起来更方便、易读。",[1546,2900],{},[1525,2902,2904],{"id":2903},"知识问答qa","❓ 知识问答（Q&A）",[1530,2906,2907],{},"Q：Promise 的三种状态分别是什么？",[1530,2909,2910],{},"A：等待中（pending）、已完成（fulfilled）、已失败（rejected）。",[1530,2912,2913],{},"Q：async/await 是什么？为什么用它？",[1530,2915,2916],{},"A：async/await 是基于 Promise 的语法糖，能让异步代码像同步代码一样写，提高代码可读性和维护性。",[1530,2918,2919],{},"Q：如何捕获 async 函数中可能出现的错误？",[1530,2921,2922,2923,2925,2926,2928],{},"A：使用 ",[1534,2924,2459],{}," 块包裹 ",[1534,2927,2361],{}," 的代码，捕获异常。",[1546,2930],{},[1525,2932,2934],{"id":2933},"小练习","🧪 小练习",[2474,2936,2937],{},[1816,2938,2939,2940,2942],{},"请写一个函数，返回一个 Promise，延迟 2 秒后返回“成功”。用 ",[1534,2941,2223],{}," 打印结果。",[1607,2944,2946],{"className":1609,"code":2945,"language":1611,"meta":1612,"style":1612},"function delaySuccess() {\n    // 你的代码在这里\n}\ndelaySuccess().then(result => console.log(result));\n",[1534,2947,2948,2959,2964,2968],{"__ignoreMap":1612},[1616,2949,2950,2952,2955,2957],{"class":1618,"line":1619},[1616,2951,2257],{"class":1622},[1616,2953,2954],{"class":1667}," delaySuccess",[1616,2956,1674],{"class":1630},[1616,2958,1661],{"class":1630},[1616,2960,2961],{"class":1618,"line":1664},[1616,2962,2963],{"class":1700},"    // 你的代码在这里\n",[1616,2965,2966],{"class":1618,"line":1681},[1616,2967,2434],{"class":1630},[1616,2969,2970,2973,2975,2977,2979,2981,2983,2985,2987,2989,2991,2993],{"class":1618,"line":1704},[1616,2971,2972],{"class":1667},"delaySuccess",[1616,2974,1674],{"class":1626},[1616,2976,1865],{"class":1630},[1616,2978,1848],{"class":1667},[1616,2980,1641],{"class":1626},[1616,2982,1853],{"class":1646},[1616,2984,1658],{"class":1622},[1616,2986,2775],{"class":1626},[1616,2988,1865],{"class":1630},[1616,2990,1868],{"class":1667},[1616,2992,2782],{"class":1626},[1616,2994,1742],{"class":1630},[2474,2996,2997],{"start":1664},[1816,2998,2999],{},"用 async/await 重写上面的函数，使用 try/catch 捕获错误。",[1607,3001,3003],{"className":1609,"code":3002,"language":1611,"meta":1612,"style":1612},"async function asyncDelaySuccess() {\n    // 你的代码在这里\n}\n\nasyncDelaySuccess();\n",[1534,3004,3005,3018,3022,3026,3030],{"__ignoreMap":1612},[1616,3006,3007,3009,3011,3014,3016],{"class":1618,"line":1619},[1616,3008,2357],{"class":1622},[1616,3010,2280],{"class":1622},[1616,3012,3013],{"class":1667}," asyncDelaySuccess",[1616,3015,1674],{"class":1630},[1616,3017,1661],{"class":1630},[1616,3019,3020],{"class":1618,"line":1664},[1616,3021,2963],{"class":1700},[1616,3023,3024],{"class":1618,"line":1681},[1616,3025,2434],{"class":1630},[1616,3027,3028],{"class":1618,"line":1704},[1616,3029,2558],{"emptyLinePlaceholder":2557},[1616,3031,3032,3035,3037],{"class":1618,"line":1723},[1616,3033,3034],{"class":1667},"asyncDelaySuccess",[1616,3036,1674],{"class":1626},[1616,3038,1742],{"class":1630},[1546,3040],{},[1530,3042,3043],{},"🎉 恭喜你已经掌握 Promise、链式调用、async/await 异步编程技能啦！ 继续练习，前端异步编程不再难！",[3045,3046,3047],"style",{},"html pre.shiki code .s50WR, html code.shiki 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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);}",{"title":1612,"searchDepth":1664,"depth":1664,"links":3049},[3050,3051,3052,3053,3054,3055,3056,3057,3058,3059,3060],{"id":1527,"depth":1664,"text":1528},{"id":1550,"depth":1664,"text":1551},{"id":1587,"depth":1664,"text":1588},{"id":1810,"depth":1664,"text":1811},{"id":1991,"depth":1664,"text":1992},{"id":2235,"depth":1664,"text":2236},{"id":2351,"depth":1664,"text":2352},{"id":2468,"depth":1664,"text":2469},{"id":2879,"depth":1664,"text":2880},{"id":2903,"depth":1664,"text":2904},{"id":2933,"depth":1664,"text":2934},"了解 Promise 的基本概念和用法，掌握 async/await 解决异步编程难题的技巧。","md",null,{},{"title":291},{"title":291,"description":3061},"etYVD9yM5G",[3069,3071],{"title":287,"path":288,"stem":289,"description":3070,"children":-1},"通过分步骤讲解，让前端小白轻松理解并掌握 ES6 新增的 Map 和 Set 数据结构及其常用操作。",{"title":295,"path":296,"stem":297,"description":3072,"children":-1},"了解 ES6 的 ESM 模块化机制，掌握如何使用 import/export 来组织前端代码。",1784715107899]