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max",[1611,1776,1777],{"class":1617},")",[1611,1779,1638],{"class":1617},[1611,1781,1783],{"class":1613,"line":1782},12,[1611,1784,1786],{"class":1785},"syuKq","        // Math.random() 生成0到1随机小数，乘以区间大小，再加上最小值，最后向下取整\n",[1611,1788,1790,1794,1798,1801,1804,1806,1809,1811,1814,1817,1820,1823,1826,1829,1832,1835,1838,1841,1844,1846],{"class":1613,"line":1789},13,[1611,1791,1793],{"class":1792},"s8pZq","        return",[1611,1795,1797],{"class":1796},"sndM8"," Math",[1611,1799,1800],{"class":1617},".",[1611,1802,1803],{"class":1760},"floor",[1611,1805,1764],{"class":1621},[1611,1807,1808],{"class":1796},"Math",[1611,1810,1800],{"class":1617},[1611,1812,1813],{"class":1760},"random",[1611,1815,1816],{"class":1621},"() ",[1611,1818,1819],{"class":1617},"*",[1611,1821,1822],{"class":1621}," (",[1611,1824,1825],{"class":1796},"max",[1611,1827,1828],{"class":1617}," -",[1611,1830,1831],{"class":1796}," min",[1611,1833,1834],{"class":1617}," +",[1611,1836,1837],{"class":1651}," 1",[1611,1839,1840],{"class":1621},")) ",[1611,1842,1843],{"class":1617},"+",[1611,1845,1831],{"class":1796},[1611,1847,1658],{"class":1617},[1611,1849,1851],{"class":1613,"line":1850},14,[1611,1852,1677],{"class":1617},[1611,1854,1856],{"class":1613,"line":1855},15,[1611,1857,1694],{"emptyLinePlaceholder":1693},[1611,1859,1861,1864,1866,1869,1871,1874,1876,1878,1880,1882,1885],{"class":1613,"line":1860},16,[1611,1862,1863],{"class":1796},"    document",[1611,1865,1800],{"class":1617},[1611,1867,1868],{"class":1760},"getElementById",[1611,1870,1764],{"class":1796},[1611,1872,1873],{"class":1617},"'",[1611,1875,1727],{"class":1715},[1611,1877,1873],{"class":1617},[1611,1879,1777],{"class":1796},[1611,1881,1800],{"class":1617},[1611,1883,1884],{"class":1796},"textContent ",[1611,1886,1887],{"class":1617},"=\n",[1611,1889,1891,1894,1897,1899,1901,1903,1905,1908,1910,1913,1915],{"class":1613,"line":1890},17,[1611,1892,1893],{"class":1617},"        '",[1611,1895,1896],{"class":1715},"随机数（1~100）：",[1611,1898,1873],{"class":1617},[1611,1900,1834],{"class":1617},[1611,1902,1761],{"class":1760},[1611,1904,1764],{"class":1796},[1611,1906,1907],{"class":1651},"1",[1611,1909,1771],{"class":1617},[1611,1911,1912],{"class":1651}," 100",[1611,1914,1777],{"class":1796},[1611,1916,1658],{"class":1617},[1611,1918,1920,1922,1924],{"class":1613,"line":1919},18,[1611,1921,1683],{"class":1617},[1611,1923,1749],{"class":1621},[1611,1925,1625],{"class":1617},[1530,1927,1928,1929,1932],{},"这里 ",[1556,1930,1931],{},"getRandomInt"," 函数可以灵活生成任意区间的整数，前端游戏、抽奖、分页等项目很常见。",[1545,1934,1936],{"id":1935},"例子-2计算数组中的最大值和最小值","例子 2：计算数组中的最大值和最小值",[1602,1938,1940],{"className":1604,"code":1939,"language":1606,"meta":1607,"style":1607},"\u003Cstyle>\n    .example {\n        margin: 10px 0;\n        font-size: 16px;\n    }\n\u003C/style>\n\u003Cdiv class=\"example\" id=\"maxMin\">\u003C/div>\n\n\u003Cscript>\n    const numbers = [10, 23, 45, 2, 78, 34];\n    const max = Math.max(...numbers);\n    const min = Math.min(...numbers);\n\n    document.getElementById('maxMin').textContent = `数组最大值是 ${max}，最小值是 ${min}`;\n\u003C/script>\n",[1556,1941,1942,1950,1958,1970,1980,1984,1992,2025,2029,2037,2083,2108,2131,2135,2185],{"__ignoreMap":1607},[1611,1943,1944,1946,1948],{"class":1613,"line":1614},[1611,1945,1618],{"class":1617},[1611,1947,1622],{"class":1621},[1611,1949,1625],{"class":1617},[1611,1951,1952,1954,1956],{"class":1613,"line":1628},[1611,1953,1631],{"class":1617},[1611,1955,1635],{"class":1634},[1611,1957,1638],{"class":1617},[1611,1959,1960,1962,1964,1966,1968],{"class":1613,"line":1641},[1611,1961,1645],{"class":1644},[1611,1963,1648],{"class":1617},[1611,1965,1652],{"class":1651},[1611,1967,1655],{"class":1651},[1611,1969,1658],{"class":1617},[1611,1971,1972,1974,1976,1978],{"class":1613,"line":1661},[1611,1973,1664],{"class":1644},[1611,1975,1648],{"class":1617},[1611,1977,1669],{"class":1651},[1611,1979,1658],{"class":1617},[1611,1981,1982],{"class":1613,"line":1674},[1611,1983,1677],{"class":1617},[1611,1985,1986,1988,1990],{"class":1613,"line":1680},[1611,1987,1683],{"class":1617},[1611,1989,1622],{"class":1621},[1611,1991,1625],{"class":1617},[1611,1993,1994,1996,1998,2000,2002,2004,2006,2008,2010,2012,2014,2017,2019,2021,2023],{"class":1613,"line":1690},[1611,1995,1618],{"class":1617},[1611,1997,1702],{"class":1621},[1611,1999,1706],{"class":1705},[1611,2001,1709],{"class":1617},[1611,2003,1712],{"class":1617},[1611,2005,1635],{"class":1715},[1611,2007,1712],{"class":1617},[1611,2009,1720],{"class":1705},[1611,2011,1709],{"class":1617},[1611,2013,1712],{"class":1617},[1611,2015,2016],{"class":1715},"maxMin",[1611,2018,1712],{"class":1617},[1611,2020,1732],{"class":1617},[1611,2022,1702],{"class":1621},[1611,2024,1625],{"class":1617},[1611,2026,2027],{"class":1613,"line":1697},[1611,2028,1694],{"emptyLinePlaceholder":1693},[1611,2030,2031,2033,2035],{"class":1613,"line":1739},[1611,2032,1618],{"class":1617},[1611,2034,1749],{"class":1621},[1611,2036,1625],{"class":1617},[1611,2038,2039,2042,2045,2047,2050,2053,2055,2058,2060,2063,2065,2068,2070,2073,2075,2078,2081],{"class":1613,"line":1744},[1611,2040,2041],{"class":1705},"    const",[1611,2043,2044],{"class":1796}," numbers ",[1611,2046,1709],{"class":1617},[1611,2048,2049],{"class":1796}," [",[1611,2051,2052],{"class":1651},"10",[1611,2054,1771],{"class":1617},[1611,2056,2057],{"class":1651}," 23",[1611,2059,1771],{"class":1617},[1611,2061,2062],{"class":1651}," 45",[1611,2064,1771],{"class":1617},[1611,2066,2067],{"class":1651}," 2",[1611,2069,1771],{"class":1617},[1611,2071,2072],{"class":1651}," 78",[1611,2074,1771],{"class":1617},[1611,2076,2077],{"class":1651}," 34",[1611,2079,2080],{"class":1796},"]",[1611,2082,1658],{"class":1617},[1611,2084,2085,2087,2090,2092,2094,2096,2098,2100,2103,2106],{"class":1613,"line":1754},[1611,2086,2041],{"class":1705},[1611,2088,2089],{"class":1796}," max ",[1611,2091,1709],{"class":1617},[1611,2093,1797],{"class":1796},[1611,2095,1800],{"class":1617},[1611,2097,1825],{"class":1760},[1611,2099,1764],{"class":1796},[1611,2101,2102],{"class":1617},"...",[1611,2104,2105],{"class":1796},"numbers)",[1611,2107,1658],{"class":1617},[1611,2109,2110,2112,2115,2117,2119,2121,2123,2125,2127,2129],{"class":1613,"line":1782},[1611,2111,2041],{"class":1705},[1611,2113,2114],{"class":1796}," min ",[1611,2116,1709],{"class":1617},[1611,2118,1797],{"class":1796},[1611,2120,1800],{"class":1617},[1611,2122,1768],{"class":1760},[1611,2124,1764],{"class":1796},[1611,2126,2102],{"class":1617},[1611,2128,2105],{"class":1796},[1611,2130,1658],{"class":1617},[1611,2132,2133],{"class":1613,"line":1789},[1611,2134,1694],{"emptyLinePlaceholder":1693},[1611,2136,2137,2139,2141,2143,2145,2147,2149,2151,2153,2155,2157,2159,2162,2165,2168,2170,2173,2176,2178,2180,2183],{"class":1613,"line":1850},[1611,2138,1863],{"class":1796},[1611,2140,1800],{"class":1617},[1611,2142,1868],{"class":1760},[1611,2144,1764],{"class":1796},[1611,2146,1873],{"class":1617},[1611,2148,2016],{"class":1715},[1611,2150,1873],{"class":1617},[1611,2152,1777],{"class":1796},[1611,2154,1800],{"class":1617},[1611,2156,1884],{"class":1796},[1611,2158,1709],{"class":1617},[1611,2160,2161],{"class":1617}," `",[1611,2163,2164],{"class":1715},"数组最大值是 ",[1611,2166,2167],{"class":1617},"${",[1611,2169,1825],{"class":1796},[1611,2171,2172],{"class":1617},"}",[1611,2174,2175],{"class":1715},"，最小值是 ",[1611,2177,2167],{"class":1617},[1611,2179,1768],{"class":1796},[1611,2181,2182],{"class":1617},"}`",[1611,2184,1658],{"class":1617},[1611,2186,2187,2189,2191],{"class":1613,"line":1855},[1611,2188,1683],{"class":1617},[1611,2190,1749],{"class":1621},[1611,2192,1625],{"class":1617},[1530,2194,2195,2196,2199,2200,2202,2203,1583,2206,2209],{},"这里临时用到了 ",[1556,2197,2198],{},"ES6"," 扩展运算符 ",[1556,2201,2102],{},"，把数组展开成参数列表传给 ",[1556,2204,2205],{},"Math.max",[1556,2207,2208],{},"Math.min","。",[1534,2211],{},[1537,2213,2215],{"id":2214},"date-对象基础与实操","⏰ Date 对象基础与实操",[1530,2217,2218],{},"Date 对象是 JavaScript 用来处理日期和时间的工具。日常项目中经常会用到，比如显示当前时间、计算时间差、格式化日期等。",[1545,2220,2222],{"id":2221},"创建-date-对象","创建 Date 对象",[1550,2224,2225,2231,2237],{},[1553,2226,2227,2230],{},[1556,2228,2229],{},"new Date()","：创建当前时间的日期对象。",[1553,2232,2233,2236],{},[1556,2234,2235],{},"new Date('2024-06-01')","：传入日期字符串创建指定日期对象。",[1553,2238,2239,2242],{},[1556,2240,2241],{},"new Date(timestamp)","：用时间戳创建时间对象。",[1545,2244,2246],{"id":2245},"获取-date-对象的方法","获取 Date 对象的方法",[1550,2248,2249,2255,2261,2267],{},[1553,2250,2251,2254],{},[1556,2252,2253],{},"getFullYear()","：获取四位年份。",[1553,2256,2257,2260],{},[1556,2258,2259],{},"getMonth()","：获取月份（0~11，0代表1月）。",[1553,2262,2263,2266],{},[1556,2264,2265],{},"getDate()","：获取一个月中的第几天。",[1553,2268,2269,2272,2273,2272,2276,2279],{},[1556,2270,2271],{},"getHours()",", ",[1556,2274,2275],{},"getMinutes()",[1556,2277,2278],{},"getSeconds()","：获取时分秒。",[2281,2282,2283],"warning",{},[1530,2284,2285],{},"注意 Date 的月份是从 0 开始的，所以要加 1 显示正常月份。",[1545,2287,2289,2290],{"id":2288},"例子-3显示当前格式化时间-yyyy-mm-dd-hhmmss","例子 3：显示当前格式化时间 ",[1556,2291,2292],{},"YYYY-MM-DD HH:mm:ss",[1602,2294,2296],{"className":1604,"code":2295,"language":1606,"meta":1607,"style":1607},"\u003Cstyle>\n    .example {\n        margin: 10px 0;\n        font-size: 16px;\n    }\n\u003C/style>\n\u003Cdiv class=\"example\" id=\"currentTime\">\u003C/div>\n\n\u003Cscript>\n    function formatDate(date) {\n        const year = date.getFullYear();\n        const month = date.getMonth() + 1;\n        const day = date.getDate();\n        const hours = date.getHours();\n        const minutes = date.getMinutes();\n        const seconds = date.getSeconds();\n\n        // 补零函数，个位数补0\n        const padZero = num => (num \u003C 10 ? '0' + num : num);\n\n        return (\n            `${year}-${padZero(month)}-${padZero(day)} ` +\n            `${padZero(hours)}:${padZero(minutes)}:${padZero(seconds)}`\n        );\n    }\n\n    const now = new Date();\n    document.getElementById('currentTime').textContent = '当前时间：' + formatDate(now);\n\u003C/script>\n",[1556,2297,2298,2306,2314,2326,2336,2340,2348,2381,2385,2393,2409,2433,2457,2477,2497,2517,2537,2541,2546,2597,2602,2610,2650,2685,2693,2698,2703,2723,2764],{"__ignoreMap":1607},[1611,2299,2300,2302,2304],{"class":1613,"line":1614},[1611,2301,1618],{"class":1617},[1611,2303,1622],{"class":1621},[1611,2305,1625],{"class":1617},[1611,2307,2308,2310,2312],{"class":1613,"line":1628},[1611,2309,1631],{"class":1617},[1611,2311,1635],{"class":1634},[1611,2313,1638],{"class":1617},[1611,2315,2316,2318,2320,2322,2324],{"class":1613,"line":1641},[1611,2317,1645],{"class":1644},[1611,2319,1648],{"class":1617},[1611,2321,1652],{"class":1651},[1611,2323,1655],{"class":1651},[1611,2325,1658],{"class":1617},[1611,2327,2328,2330,2332,2334],{"class":1613,"line":1661},[1611,2329,1664],{"class":1644},[1611,2331,1648],{"class":1617},[1611,2333,1669],{"class":1651},[1611,2335,1658],{"class":1617},[1611,2337,2338],{"class":1613,"line":1674},[1611,2339,1677],{"class":1617},[1611,2341,2342,2344,2346],{"class":1613,"line":1680},[1611,2343,1683],{"class":1617},[1611,2345,1622],{"class":1621},[1611,2347,1625],{"class":1617},[1611,2349,2350,2352,2354,2356,2358,2360,2362,2364,2366,2368,2370,2373,2375,2377,2379],{"class":1613,"line":1690},[1611,2351,1618],{"class":1617},[1611,2353,1702],{"class":1621},[1611,2355,1706],{"class":1705},[1611,2357,1709],{"class":1617},[1611,2359,1712],{"class":1617},[1611,2361,1635],{"class":1715},[1611,2363,1712],{"class":1617},[1611,2365,1720],{"class":1705},[1611,2367,1709],{"class":1617},[1611,2369,1712],{"class":1617},[1611,2371,2372],{"class":1715},"currentTime",[1611,2374,1712],{"class":1617},[1611,2376,1732],{"class":1617},[1611,2378,1702],{"class":1621},[1611,2380,1625],{"class":1617},[1611,2382,2383],{"class":1613,"line":1697},[1611,2384,1694],{"emptyLinePlaceholder":1693},[1611,2386,2387,2389,2391],{"class":1613,"line":1739},[1611,2388,1618],{"class":1617},[1611,2390,1749],{"class":1621},[1611,2392,1625],{"class":1617},[1611,2394,2395,2397,2400,2402,2405,2407],{"class":1613,"line":1744},[1611,2396,1757],{"class":1705},[1611,2398,2399],{"class":1760}," formatDate",[1611,2401,1764],{"class":1617},[1611,2403,2404],{"class":1767},"date",[1611,2406,1777],{"class":1617},[1611,2408,1638],{"class":1617},[1611,2410,2411,2414,2417,2420,2423,2425,2428,2431],{"class":1613,"line":1754},[1611,2412,2413],{"class":1705},"        const",[1611,2415,2416],{"class":1796}," year",[1611,2418,2419],{"class":1617}," =",[1611,2421,2422],{"class":1796}," date",[1611,2424,1800],{"class":1617},[1611,2426,2427],{"class":1760},"getFullYear",[1611,2429,2430],{"class":1621},"()",[1611,2432,1658],{"class":1617},[1611,2434,2435,2437,2440,2442,2444,2446,2449,2451,2453,2455],{"class":1613,"line":1782},[1611,2436,2413],{"class":1705},[1611,2438,2439],{"class":1796}," month",[1611,2441,2419],{"class":1617},[1611,2443,2422],{"class":1796},[1611,2445,1800],{"class":1617},[1611,2447,2448],{"class":1760},"getMonth",[1611,2450,1816],{"class":1621},[1611,2452,1843],{"class":1617},[1611,2454,1837],{"class":1651},[1611,2456,1658],{"class":1617},[1611,2458,2459,2461,2464,2466,2468,2470,2473,2475],{"class":1613,"line":1789},[1611,2460,2413],{"class":1705},[1611,2462,2463],{"class":1796}," day",[1611,2465,2419],{"class":1617},[1611,2467,2422],{"class":1796},[1611,2469,1800],{"class":1617},[1611,2471,2472],{"class":1760},"getDate",[1611,2474,2430],{"class":1621},[1611,2476,1658],{"class":1617},[1611,2478,2479,2481,2484,2486,2488,2490,2493,2495],{"class":1613,"line":1850},[1611,2480,2413],{"class":1705},[1611,2482,2483],{"class":1796}," hours",[1611,2485,2419],{"class":1617},[1611,2487,2422],{"class":1796},[1611,2489,1800],{"class":1617},[1611,2491,2492],{"class":1760},"getHours",[1611,2494,2430],{"class":1621},[1611,2496,1658],{"class":1617},[1611,2498,2499,2501,2504,2506,2508,2510,2513,2515],{"class":1613,"line":1855},[1611,2500,2413],{"class":1705},[1611,2502,2503],{"class":1796}," minutes",[1611,2505,2419],{"class":1617},[1611,2507,2422],{"class":1796},[1611,2509,1800],{"class":1617},[1611,2511,2512],{"class":1760},"getMinutes",[1611,2514,2430],{"class":1621},[1611,2516,1658],{"class":1617},[1611,2518,2519,2521,2524,2526,2528,2530,2533,2535],{"class":1613,"line":1860},[1611,2520,2413],{"class":1705},[1611,2522,2523],{"class":1796}," seconds",[1611,2525,2419],{"class":1617},[1611,2527,2422],{"class":1796},[1611,2529,1800],{"class":1617},[1611,2531,2532],{"class":1760},"getSeconds",[1611,2534,2430],{"class":1621},[1611,2536,1658],{"class":1617},[1611,2538,2539],{"class":1613,"line":1890},[1611,2540,1694],{"emptyLinePlaceholder":1693},[1611,2542,2543],{"class":1613,"line":1919},[1611,2544,2545],{"class":1785},"        // 补零函数，个位数补0\n",[1611,2547,2549,2551,2554,2556,2559,2562,2564,2567,2570,2573,2576,2579,2582,2584,2586,2588,2591,2593,2595],{"class":1613,"line":2548},19,[1611,2550,2413],{"class":1705},[1611,2552,2553],{"class":1796}," padZero",[1611,2555,2419],{"class":1617},[1611,2557,2558],{"class":1767}," num",[1611,2560,2561],{"class":1705}," =>",[1611,2563,1822],{"class":1621},[1611,2565,2566],{"class":1796},"num",[1611,2568,2569],{"class":1617}," \u003C",[1611,2571,2572],{"class":1651}," 10",[1611,2574,2575],{"class":1617}," ?",[1611,2577,2578],{"class":1617}," '",[1611,2580,2581],{"class":1715},"0",[1611,2583,1873],{"class":1617},[1611,2585,1834],{"class":1617},[1611,2587,2558],{"class":1796},[1611,2589,2590],{"class":1617}," :",[1611,2592,2558],{"class":1796},[1611,2594,1777],{"class":1621},[1611,2596,1658],{"class":1617},[1611,2598,2600],{"class":1613,"line":2599},20,[1611,2601,1694],{"emptyLinePlaceholder":1693},[1611,2603,2605,2607],{"class":1613,"line":2604},21,[1611,2606,1793],{"class":1792},[1611,2608,2609],{"class":1621}," (\n",[1611,2611,2613,2616,2619,2621,2624,2626,2629,2632,2634,2636,2638,2640,2643,2645,2647],{"class":1613,"line":2612},22,[1611,2614,2615],{"class":1617},"            `${",[1611,2617,2618],{"class":1796},"year",[1611,2620,2172],{"class":1617},[1611,2622,2623],{"class":1715},"-",[1611,2625,2167],{"class":1617},[1611,2627,2628],{"class":1760},"padZero",[1611,2630,2631],{"class":1796},"(month)",[1611,2633,2172],{"class":1617},[1611,2635,2623],{"class":1715},[1611,2637,2167],{"class":1617},[1611,2639,2628],{"class":1760},[1611,2641,2642],{"class":1796},"(day)",[1611,2644,2172],{"class":1617},[1611,2646,2161],{"class":1617},[1611,2648,2649],{"class":1617}," +\n",[1611,2651,2653,2655,2657,2660,2662,2664,2666,2668,2671,2673,2675,2677,2679,2682],{"class":1613,"line":2652},23,[1611,2654,2615],{"class":1617},[1611,2656,2628],{"class":1760},[1611,2658,2659],{"class":1796},"(hours)",[1611,2661,2172],{"class":1617},[1611,2663,1648],{"class":1715},[1611,2665,2167],{"class":1617},[1611,2667,2628],{"class":1760},[1611,2669,2670],{"class":1796},"(minutes)",[1611,2672,2172],{"class":1617},[1611,2674,1648],{"class":1715},[1611,2676,2167],{"class":1617},[1611,2678,2628],{"class":1760},[1611,2680,2681],{"class":1796},"(seconds)",[1611,2683,2684],{"class":1617},"}`\n",[1611,2686,2688,2691],{"class":1613,"line":2687},24,[1611,2689,2690],{"class":1621},"        )",[1611,2692,1658],{"class":1617},[1611,2694,2696],{"class":1613,"line":2695},25,[1611,2697,1677],{"class":1617},[1611,2699,2701],{"class":1613,"line":2700},26,[1611,2702,1694],{"emptyLinePlaceholder":1693},[1611,2704,2706,2708,2711,2713,2716,2719,2721],{"class":1613,"line":2705},27,[1611,2707,2041],{"class":1705},[1611,2709,2710],{"class":1796}," now ",[1611,2712,1709],{"class":1617},[1611,2714,2715],{"class":1617}," new",[1611,2717,2718],{"class":1760}," Date",[1611,2720,2430],{"class":1796},[1611,2722,1658],{"class":1617},[1611,2724,2726,2728,2730,2732,2734,2736,2738,2740,2742,2744,2746,2748,2750,2753,2755,2757,2759,2762],{"class":1613,"line":2725},28,[1611,2727,1863],{"class":1796},[1611,2729,1800],{"class":1617},[1611,2731,1868],{"class":1760},[1611,2733,1764],{"class":1796},[1611,2735,1873],{"class":1617},[1611,2737,2372],{"class":1715},[1611,2739,1873],{"class":1617},[1611,2741,1777],{"class":1796},[1611,2743,1800],{"class":1617},[1611,2745,1884],{"class":1796},[1611,2747,1709],{"class":1617},[1611,2749,2578],{"class":1617},[1611,2751,2752],{"class":1715},"当前时间：",[1611,2754,1873],{"class":1617},[1611,2756,1834],{"class":1617},[1611,2758,2399],{"class":1760},[1611,2760,2761],{"class":1796},"(now)",[1611,2763,1658],{"class":1617},[1611,2765,2767,2769,2771],{"class":1613,"line":2766},29,[1611,2768,1683],{"class":1617},[1611,2770,1749],{"class":1621},[1611,2772,1625],{"class":1617},[1545,2774,2776],{"id":2775},"例子-4计算两个日期之间的天数差","例子 4：计算两个日期之间的天数差",[1602,2778,2780],{"className":1604,"code":2779,"language":1606,"meta":1607,"style":1607},"\u003Cstyle>\n    .example {\n        margin: 10px 0;\n        font-size: 16px;\n    }\n\u003C/style>\n\u003Cdiv class=\"example\" id=\"dateDiff\">\u003C/div>\n\n\u003Cscript>\n    const date1 = new Date('2024-06-01');\n    const date2 = new Date('2024-06-10');\n\n    // 计算时间差，单位是毫秒\n    const diffTime = date2.getTime() - date1.getTime();\n    // 1 天 = 24 * 60 * 60 * 1000 毫秒\n    const diffDays = diffTime / (1000 * 60 * 60 * 24);\n\n    document.getElementById('dateDiff').textContent = `日期相差 ${diffDays} 天`;\n\u003C/script>\n",[1556,2781,2782,2790,2798,2810,2820,2824,2832,2865,2869,2877,2903,2929,2933,2938,2970,2975,3013,3017,3061],{"__ignoreMap":1607},[1611,2783,2784,2786,2788],{"class":1613,"line":1614},[1611,2785,1618],{"class":1617},[1611,2787,1622],{"class":1621},[1611,2789,1625],{"class":1617},[1611,2791,2792,2794,2796],{"class":1613,"line":1628},[1611,2793,1631],{"class":1617},[1611,2795,1635],{"class":1634},[1611,2797,1638],{"class":1617},[1611,2799,2800,2802,2804,2806,2808],{"class":1613,"line":1641},[1611,2801,1645],{"class":1644},[1611,2803,1648],{"class":1617},[1611,2805,1652],{"class":1651},[1611,2807,1655],{"class":1651},[1611,2809,1658],{"class":1617},[1611,2811,2812,2814,2816,2818],{"class":1613,"line":1661},[1611,2813,1664],{"class":1644},[1611,2815,1648],{"class":1617},[1611,2817,1669],{"class":1651},[1611,2819,1658],{"class":1617},[1611,2821,2822],{"class":1613,"line":1674},[1611,2823,1677],{"class":1617},[1611,2825,2826,2828,2830],{"class":1613,"line":1680},[1611,2827,1683],{"class":1617},[1611,2829,1622],{"class":1621},[1611,2831,1625],{"class":1617},[1611,2833,2834,2836,2838,2840,2842,2844,2846,2848,2850,2852,2854,2857,2859,2861,2863],{"class":1613,"line":1690},[1611,2835,1618],{"class":1617},[1611,2837,1702],{"class":1621},[1611,2839,1706],{"class":1705},[1611,2841,1709],{"class":1617},[1611,2843,1712],{"class":1617},[1611,2845,1635],{"class":1715},[1611,2847,1712],{"class":1617},[1611,2849,1720],{"class":1705},[1611,2851,1709],{"class":1617},[1611,2853,1712],{"class":1617},[1611,2855,2856],{"class":1715},"dateDiff",[1611,2858,1712],{"class":1617},[1611,2860,1732],{"class":1617},[1611,2862,1702],{"class":1621},[1611,2864,1625],{"class":1617},[1611,2866,2867],{"class":1613,"line":1697},[1611,2868,1694],{"emptyLinePlaceholder":1693},[1611,2870,2871,2873,2875],{"class":1613,"line":1739},[1611,2872,1618],{"class":1617},[1611,2874,1749],{"class":1621},[1611,2876,1625],{"class":1617},[1611,2878,2879,2881,2884,2886,2888,2890,2892,2894,2897,2899,2901],{"class":1613,"line":1744},[1611,2880,2041],{"class":1705},[1611,2882,2883],{"class":1796}," date1 ",[1611,2885,1709],{"class":1617},[1611,2887,2715],{"class":1617},[1611,2889,2718],{"class":1760},[1611,2891,1764],{"class":1796},[1611,2893,1873],{"class":1617},[1611,2895,2896],{"class":1715},"2024-06-01",[1611,2898,1873],{"class":1617},[1611,2900,1777],{"class":1796},[1611,2902,1658],{"class":1617},[1611,2904,2905,2907,2910,2912,2914,2916,2918,2920,2923,2925,2927],{"class":1613,"line":1754},[1611,2906,2041],{"class":1705},[1611,2908,2909],{"class":1796}," date2 ",[1611,2911,1709],{"class":1617},[1611,2913,2715],{"class":1617},[1611,2915,2718],{"class":1760},[1611,2917,1764],{"class":1796},[1611,2919,1873],{"class":1617},[1611,2921,2922],{"class":1715},"2024-06-10",[1611,2924,1873],{"class":1617},[1611,2926,1777],{"class":1796},[1611,2928,1658],{"class":1617},[1611,2930,2931],{"class":1613,"line":1782},[1611,2932,1694],{"emptyLinePlaceholder":1693},[1611,2934,2935],{"class":1613,"line":1789},[1611,2936,2937],{"class":1785},"    // 计算时间差，单位是毫秒\n",[1611,2939,2940,2942,2945,2947,2950,2952,2955,2957,2959,2962,2964,2966,2968],{"class":1613,"line":1850},[1611,2941,2041],{"class":1705},[1611,2943,2944],{"class":1796}," diffTime ",[1611,2946,1709],{"class":1617},[1611,2948,2949],{"class":1796}," date2",[1611,2951,1800],{"class":1617},[1611,2953,2954],{"class":1760},"getTime",[1611,2956,1816],{"class":1796},[1611,2958,2623],{"class":1617},[1611,2960,2961],{"class":1796}," date1",[1611,2963,1800],{"class":1617},[1611,2965,2954],{"class":1760},[1611,2967,2430],{"class":1796},[1611,2969,1658],{"class":1617},[1611,2971,2972],{"class":1613,"line":1855},[1611,2973,2974],{"class":1785},"    // 1 天 = 24 * 60 * 60 * 1000 毫秒\n",[1611,2976,2977,2979,2982,2984,2986,2989,2991,2994,2997,3000,3002,3004,3006,3009,3011],{"class":1613,"line":1860},[1611,2978,2041],{"class":1705},[1611,2980,2981],{"class":1796}," diffDays ",[1611,2983,1709],{"class":1617},[1611,2985,2944],{"class":1796},[1611,2987,2988],{"class":1617},"/",[1611,2990,1822],{"class":1796},[1611,2992,2993],{"class":1651},"1000",[1611,2995,2996],{"class":1617}," *",[1611,2998,2999],{"class":1651}," 60",[1611,3001,2996],{"class":1617},[1611,3003,2999],{"class":1651},[1611,3005,2996],{"class":1617},[1611,3007,3008],{"class":1651}," 24",[1611,3010,1777],{"class":1796},[1611,3012,1658],{"class":1617},[1611,3014,3015],{"class":1613,"line":1890},[1611,3016,1694],{"emptyLinePlaceholder":1693},[1611,3018,3019,3021,3023,3025,3027,3029,3031,3033,3035,3037,3039,3041,3043,3046,3048,3051,3053,3056,3059],{"class":1613,"line":1919},[1611,3020,1863],{"class":1796},[1611,3022,1800],{"class":1617},[1611,3024,1868],{"class":1760},[1611,3026,1764],{"class":1796},[1611,3028,1873],{"class":1617},[1611,3030,2856],{"class":1715},[1611,3032,1873],{"class":1617},[1611,3034,1777],{"class":1796},[1611,3036,1800],{"class":1617},[1611,3038,1884],{"class":1796},[1611,3040,1709],{"class":1617},[1611,3042,2161],{"class":1617},[1611,3044,3045],{"class":1715},"日期相差 ",[1611,3047,2167],{"class":1617},[1611,3049,3050],{"class":1796},"diffDays",[1611,3052,2172],{"class":1617},[1611,3054,3055],{"class":1715}," 天",[1611,3057,3058],{"class":1617},"`",[1611,3060,1658],{"class":1617},[1611,3062,3063,3065,3067],{"class":1613,"line":2548},[1611,3064,1683],{"class":1617},[1611,3066,1749],{"class":1621},[1611,3068,1625],{"class":1617},[1534,3070],{},[1537,3072,3074],{"id":3073},"小节总结","🧾 小节总结",[1550,3076,3077,3080,3083],{},[1553,3078,3079],{},"Math 是前端中处理数字计算的利器，熟练掌握常用函数能简化很多工作。",[1553,3081,3082],{},"Date 用来处理时间相关问题，注意月份从 0 开始，时间差计算要用毫秒。",[1553,3084,3085],{},"结合实际场景练习，比如随机数用于抽奖，Date 用于倒计时和时间显示。",[1534,3087],{},[1537,3089,3091],{"id":3090},"知识问答qa","❓ 知识问答（Q&A）",[1530,3093,3094,3095,3098],{},"Q：Math.random() 生成的随机数包括 1 吗？",[3096,3097],"br",{},"\nA：不包括，随机数范围是 0（包含）到 1（不包含）。",[1530,3100,3101,3102,3104],{},"Q：Date 对象的月份为什么要加 1？",[3096,3103],{},"\nA：JavaScript 中月份是从 0 开始编号的，0 表示 1 月，所以显示时需要加 1。",[1530,3106,3107,3108,3110],{},"Q：如何判断两个日期相差多少天？",[3096,3109],{},"\nA：先用 getTime() 获取时间戳，计算差值后除以一天的毫秒数即可。",[1534,3112],{},[1537,3114,3116],{"id":3115},"小练习","🧪 小练习",[1545,3118,3120],{"id":3119},"练习-1使用-math-实现一个随机颜色生成器例如-a1b2c3","练习 1：使用 Math 实现一个随机颜色生成器（例如 #a1b2c3）",[1602,3122,3124],{"className":1604,"code":3123,"language":1606,"meta":1607,"style":1607},"\u003Cstyle>\n    .color-box {\n        width: 100px;\n        height: 100px;\n        border: 1px solid #ccc;\n        margin-top: 10px;\n    }\n\u003C/style>\n\u003Cdiv>\n    \u003Cbutton id=\"colorBtn\">生成随机颜色\u003C/button>\n    \u003Cdiv class=\"color-box\" id=\"colorBox\">\u003C/div>\n\u003C/div>\n\n\u003Cscript>\n    // 请完成下面的函数，点击按钮时，生成一个随机十六进制颜色并应用到 colorBox 背景色上\n    function getRandomColor() {\n        // TODO: 实现随机颜色生成\n    }\n\n    document.getElementById('colorBtn').onclick = function () {\n        const color = getRandomColor();\n        document.getElementById('colorBox').style.backgroundColor = color;\n    };\n\u003C/script>\n",[1556,3125,3126,3134,3143,3155,3166,3187,3198,3202,3210,3218,3249,3282,3290,3294,3302,3307,3318,3323,3327,3331,3364,3379,3413,3418],{"__ignoreMap":1607},[1611,3127,3128,3130,3132],{"class":1613,"line":1614},[1611,3129,1618],{"class":1617},[1611,3131,1622],{"class":1621},[1611,3133,1625],{"class":1617},[1611,3135,3136,3138,3141],{"class":1613,"line":1628},[1611,3137,1631],{"class":1617},[1611,3139,3140],{"class":1634},"color-box",[1611,3142,1638],{"class":1617},[1611,3144,3145,3148,3150,3153],{"class":1613,"line":1641},[1611,3146,3147],{"class":1644},"        width",[1611,3149,1648],{"class":1617},[1611,3151,3152],{"class":1651}," 100px",[1611,3154,1658],{"class":1617},[1611,3156,3157,3160,3162,3164],{"class":1613,"line":1661},[1611,3158,3159],{"class":1644},"        height",[1611,3161,1648],{"class":1617},[1611,3163,3152],{"class":1651},[1611,3165,1658],{"class":1617},[1611,3167,3168,3171,3173,3176,3179,3182,3185],{"class":1613,"line":1674},[1611,3169,3170],{"class":1644},"        border",[1611,3172,1648],{"class":1617},[1611,3174,3175],{"class":1651}," 1px",[1611,3177,3178],{"class":1796}," solid ",[1611,3180,3181],{"class":1617},"#",[1611,3183,3184],{"class":1796},"ccc",[1611,3186,1658],{"class":1617},[1611,3188,3189,3192,3194,3196],{"class":1613,"line":1680},[1611,3190,3191],{"class":1644},"        margin-top",[1611,3193,1648],{"class":1617},[1611,3195,1652],{"class":1651},[1611,3197,1658],{"class":1617},[1611,3199,3200],{"class":1613,"line":1690},[1611,3201,1677],{"class":1617},[1611,3203,3204,3206,3208],{"class":1613,"line":1697},[1611,3205,1683],{"class":1617},[1611,3207,1622],{"class":1621},[1611,3209,1625],{"class":1617},[1611,3211,3212,3214,3216],{"class":1613,"line":1739},[1611,3213,1618],{"class":1617},[1611,3215,1702],{"class":1621},[1611,3217,1625],{"class":1617},[1611,3219,3220,3223,3226,3228,3230,3232,3235,3237,3240,3243,3245,3247],{"class":1613,"line":1744},[1611,3221,3222],{"class":1617},"    \u003C",[1611,3224,3225],{"class":1621},"button",[1611,3227,1720],{"class":1705},[1611,3229,1709],{"class":1617},[1611,3231,1712],{"class":1617},[1611,3233,3234],{"class":1715},"colorBtn",[1611,3236,1712],{"class":1617},[1611,3238,3239],{"class":1617},">",[1611,3241,3242],{"class":1796},"生成随机颜色",[1611,3244,1683],{"class":1617},[1611,3246,3225],{"class":1621},[1611,3248,1625],{"class":1617},[1611,3250,3251,3253,3255,3257,3259,3261,3263,3265,3267,3269,3271,3274,3276,3278,3280],{"class":1613,"line":1754},[1611,3252,3222],{"class":1617},[1611,3254,1702],{"class":1621},[1611,3256,1706],{"class":1705},[1611,3258,1709],{"class":1617},[1611,3260,1712],{"class":1617},[1611,3262,3140],{"class":1715},[1611,3264,1712],{"class":1617},[1611,3266,1720],{"class":1705},[1611,3268,1709],{"class":1617},[1611,3270,1712],{"class":1617},[1611,3272,3273],{"class":1715},"colorBox",[1611,3275,1712],{"class":1617},[1611,3277,1732],{"class":1617},[1611,3279,1702],{"class":1621},[1611,3281,1625],{"class":1617},[1611,3283,3284,3286,3288],{"class":1613,"line":1782},[1611,3285,1683],{"class":1617},[1611,3287,1702],{"class":1621},[1611,3289,1625],{"class":1617},[1611,3291,3292],{"class":1613,"line":1789},[1611,3293,1694],{"emptyLinePlaceholder":1693},[1611,3295,3296,3298,3300],{"class":1613,"line":1850},[1611,3297,1618],{"class":1617},[1611,3299,1749],{"class":1621},[1611,3301,1625],{"class":1617},[1611,3303,3304],{"class":1613,"line":1855},[1611,3305,3306],{"class":1785},"    // 请完成下面的函数，点击按钮时，生成一个随机十六进制颜色并应用到 colorBox 背景色上\n",[1611,3308,3309,3311,3314,3316],{"class":1613,"line":1860},[1611,3310,1757],{"class":1705},[1611,3312,3313],{"class":1760}," getRandomColor",[1611,3315,2430],{"class":1617},[1611,3317,1638],{"class":1617},[1611,3319,3320],{"class":1613,"line":1890},[1611,3321,3322],{"class":1785},"        // TODO: 实现随机颜色生成\n",[1611,3324,3325],{"class":1613,"line":1919},[1611,3326,1677],{"class":1617},[1611,3328,3329],{"class":1613,"line":2548},[1611,3330,1694],{"emptyLinePlaceholder":1693},[1611,3332,3333,3335,3337,3339,3341,3343,3345,3347,3349,3351,3354,3356,3359,3362],{"class":1613,"line":2599},[1611,3334,1863],{"class":1796},[1611,3336,1800],{"class":1617},[1611,3338,1868],{"class":1760},[1611,3340,1764],{"class":1796},[1611,3342,1873],{"class":1617},[1611,3344,3234],{"class":1715},[1611,3346,1873],{"class":1617},[1611,3348,1777],{"class":1796},[1611,3350,1800],{"class":1617},[1611,3352,3353],{"class":1760},"onclick",[1611,3355,2419],{"class":1617},[1611,3357,3358],{"class":1705}," function",[1611,3360,3361],{"class":1617}," ()",[1611,3363,1638],{"class":1617},[1611,3365,3366,3368,3371,3373,3375,3377],{"class":1613,"line":2604},[1611,3367,2413],{"class":1705},[1611,3369,3370],{"class":1796}," color",[1611,3372,2419],{"class":1617},[1611,3374,3313],{"class":1760},[1611,3376,2430],{"class":1621},[1611,3378,1658],{"class":1617},[1611,3380,3381,3384,3386,3388,3390,3392,3394,3396,3398,3400,3402,3404,3407,3409,3411],{"class":1613,"line":2612},[1611,3382,3383],{"class":1796},"        document",[1611,3385,1800],{"class":1617},[1611,3387,1868],{"class":1760},[1611,3389,1764],{"class":1621},[1611,3391,1873],{"class":1617},[1611,3393,3273],{"class":1715},[1611,3395,1873],{"class":1617},[1611,3397,1777],{"class":1621},[1611,3399,1800],{"class":1617},[1611,3401,1622],{"class":1796},[1611,3403,1800],{"class":1617},[1611,3405,3406],{"class":1796},"backgroundColor",[1611,3408,2419],{"class":1617},[1611,3410,3370],{"class":1796},[1611,3412,1658],{"class":1617},[1611,3414,3415],{"class":1613,"line":2652},[1611,3416,3417],{"class":1617},"    };\n",[1611,3419,3420,3422,3424],{"class":1613,"line":2687},[1611,3421,1683],{"class":1617},[1611,3423,1749],{"class":1621},[1611,3425,1625],{"class":1617},[1545,3427,3429],{"id":3428},"练习-2用-date-实现一个简单的倒计时显示距离某个未来日期还剩多少天小时分钟","练习 2：用 Date 实现一个简单的倒计时，显示距离某个未来日期还剩多少天、小时、分钟",[1602,3431,3433],{"className":1604,"code":3432,"language":1606,"meta":1607,"style":1607},"\u003Cdiv id=\"countdown\">\u003C/div>\n\n\u003Cscript>\n    // 请写一个函数，计算距离 2024-12-31 00:00:00 还有多少天、小时、分钟，并显示在 countdown 中\n    function countdown() {\n        // TODO: 实现倒计时功能\n    }\n\n    setInterval(countdown, 1000); // 每秒更新一次\n\u003C/script>\n",[1556,3434,3435,3458,3462,3470,3475,3486,3491,3495,3499,3520],{"__ignoreMap":1607},[1611,3436,3437,3439,3441,3443,3445,3447,3450,3452,3454,3456],{"class":1613,"line":1614},[1611,3438,1618],{"class":1617},[1611,3440,1702],{"class":1621},[1611,3442,1720],{"class":1705},[1611,3444,1709],{"class":1617},[1611,3446,1712],{"class":1617},[1611,3448,3449],{"class":1715},"countdown",[1611,3451,1712],{"class":1617},[1611,3453,1732],{"class":1617},[1611,3455,1702],{"class":1621},[1611,3457,1625],{"class":1617},[1611,3459,3460],{"class":1613,"line":1628},[1611,3461,1694],{"emptyLinePlaceholder":1693},[1611,3463,3464,3466,3468],{"class":1613,"line":1641},[1611,3465,1618],{"class":1617},[1611,3467,1749],{"class":1621},[1611,3469,1625],{"class":1617},[1611,3471,3472],{"class":1613,"line":1661},[1611,3473,3474],{"class":1785},"    // 请写一个函数，计算距离 2024-12-31 00:00:00 还有多少天、小时、分钟，并显示在 countdown 中\n",[1611,3476,3477,3479,3482,3484],{"class":1613,"line":1674},[1611,3478,1757],{"class":1705},[1611,3480,3481],{"class":1760}," countdown",[1611,3483,2430],{"class":1617},[1611,3485,1638],{"class":1617},[1611,3487,3488],{"class":1613,"line":1680},[1611,3489,3490],{"class":1785},"        // TODO: 实现倒计时功能\n",[1611,3492,3493],{"class":1613,"line":1690},[1611,3494,1677],{"class":1617},[1611,3496,3497],{"class":1613,"line":1697},[1611,3498,1694],{"emptyLinePlaceholder":1693},[1611,3500,3501,3504,3507,3509,3512,3514,3517],{"class":1613,"line":1739},[1611,3502,3503],{"class":1760},"    setInterval",[1611,3505,3506],{"class":1796},"(countdown",[1611,3508,1771],{"class":1617},[1611,3510,3511],{"class":1651}," 1000",[1611,3513,1777],{"class":1796},[1611,3515,3516],{"class":1617},";",[1611,3518,3519],{"class":1785}," // 每秒更新一次\n",[1611,3521,3522,3524,3526],{"class":1613,"line":1744},[1611,3523,1683],{"class":1617},[1611,3525,1749],{"class":1621},[1611,3527,1625],{"class":1617},[1534,3529],{},[1530,3531,3532],{},"🎉 恭喜你已经掌握 Math 的取整、随机数生成和 Date 的日期时间操作技能啦！这些基础内容，是你成为前端高手的必备武器。继续加油，实践让你更强！",[1622,3534,3535],{},"html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sug0G, html code.shiki .sug0G{--shiki-light:#8796B0;--shiki-default:#B2CCD6;--shiki-dark:#B2CCD6}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .s50WR, html code.shiki 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HH:mm:ss",{"id":2775,"depth":1641,"text":2776},{"id":3073,"depth":1628,"text":3074},{"id":3090,"depth":1628,"text":3091},{"id":3115,"depth":1628,"text":3116,"children":3553},[3554,3555],{"id":3119,"depth":1641,"text":3120},{"id":3428,"depth":1641,"text":3429},"通过实用示例深入理解 JavaScript 中 Math 和 Date 对象的常见用法，适合前端初学者快速掌握。","md",null,{},{"title":182},{"title":182,"description":3556},"mpfNfn4Raf",[3564,3566],{"title":178,"path":179,"stem":180,"description":3565,"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。",{"title":191,"path":192,"stem":193,"description":3567,"children":-1},"通过这篇文章，初学者能了解什么是 DOM，如何用 JavaScript 操作 DOM，让网页内容和结构动态变化。",1784715106241]