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(",[1581,1773,1775],{"class":1774},"sK9QF","d",[1581,1777,1712],{"class":1591},[1581,1779,1780],{"class":1774}," i",[1581,1782,1611],{"class":1591},[1581,1784,1786],{"class":1785},"s50WR"," =>",[1581,1788,1789],{"class":1587}," i ",[1581,1791,1792],{"class":1591},"*",[1581,1794,1795],{"class":1715}," 60",[1581,1797,1611],{"class":1587},[1581,1799,1721],{"class":1591},[1530,1801,1802,1803,1806,1807,1809,1810,1813,1814,1817],{},"传函数时，D3 会对",[1559,1804,1805],{},"每个元素各调用一次","，并传入两个参数：",[1534,1808,1775],{}," 是这个元素绑定的数据，",[1534,1811,1812],{},"i"," 是它是第几个。假设数据是 ",[1534,1815,1816],{},"[120, 200, 150]","，这个函数会被调用 3 次：",[1819,1820,1821,1840],"table",{},[1822,1823,1824],"thead",{},[1825,1826,1827,1831,1834,1837],"tr",{},[1828,1829,1830],"th",{},"第几次调用",[1828,1832,1833],{},"d（数据）",[1828,1835,1836],{},"i（索引）",[1828,1838,1839],{},"算出 x = i × 60",[1841,1842,1843,1857,1870],"tbody",{},[1825,1844,1845,1849,1852,1855],{},[1846,1847,1848],"td",{},"1",[1846,1850,1851],{},"120",[1846,1853,1854],{},"0",[1846,1856,1854],{},[1825,1858,1859,1862,1865,1867],{},[1846,1860,1861],{},"2",[1846,1863,1864],{},"200",[1846,1866,1848],{},[1846,1868,1869],{},"60",[1825,1871,1872,1875,1878,1880],{},[1846,1873,1874],{},"3",[1846,1876,1877],{},"150",[1846,1879,1861],{},[1846,1881,1851],{},[1530,1883,1884,1887,1888,1891,1892,1894],{},[1534,1885,1886],{},"style","（改 CSS 样式）和 ",[1534,1889,1890],{},"text","（改文字内容）的用法和 ",[1534,1893,1700],{}," 完全一样。",[1539,1896],{},[1525,1898,1900],{"id":1899},"datum-和-data-的区别","⚡ datum 和 data 的区别",[1530,1902,1903],{},"两个方法都是“绑数据”，长得像，用途完全不同：",[1549,1905,1906,1916],{},[1552,1907,1908,1911,1912,1915],{},[1534,1909,1910],{},".data(数组)","：把数组",[1559,1913,1914],{},"分发","给一组元素，一个数据配一个元素。",[1552,1917,1918,1921,1922,1925],{},[1534,1919,1920],{},".datum(值)","：把",[1559,1923,1924],{},"同一个值","整体绑给元素，一个元素拿走全部。",[1572,1927,1929],{"className":1574,"code":1928,"language":1576,"meta":1577,"style":1577},"// 每个柱子配一个数据：120 给第一个、200 给第二个……\nsvg.selectAll('rect').data([120, 200, 150]);\n\n// 一条折线是一个整体，整个数组都给它\nsvg.select('path').datum(points);\n",[1534,1930,1931,1936,1979,1983,1988],{"__ignoreMap":1577},[1581,1932,1933],{"class":1583,"line":1584},[1581,1934,1935],{"class":1617},"// 每个柱子配一个数据：120 给第一个、200 给第二个……\n",[1581,1937,1938,1940,1942,1944,1946,1948,1950,1952,1954,1956,1959,1962,1964,1966,1969,1971,1974,1977],{"class":1583,"line":1621},[1581,1939,1606],{"class":1587},[1581,1941,1592],{"class":1591},[1581,1943,1628],{"class":1595},[1581,1945,1599],{"class":1587},[1581,1947,1602],{"class":1591},[1581,1949,1635],{"class":1605},[1581,1951,1602],{"class":1591},[1581,1953,1611],{"class":1587},[1581,1955,1592],{"class":1591},[1581,1957,1958],{"class":1595},"data",[1581,1960,1961],{"class":1587},"([",[1581,1963,1851],{"class":1715},[1581,1965,1712],{"class":1591},[1581,1967,1968],{"class":1715}," 200",[1581,1970,1712],{"class":1591},[1581,1972,1973],{"class":1715}," 150",[1581,1975,1976],{"class":1587},"])",[1581,1978,1721],{"class":1591},[1581,1980,1981],{"class":1583,"line":1724},[1581,1982,1728],{"emptyLinePlaceholder":1727},[1581,1984,1985],{"class":1583,"line":1731},[1581,1986,1987],{"class":1617},"// 一条折线是一个整体，整个数组都给它\n",[1581,1989,1990,1992,1994,1996,1998,2000,2003,2005,2007,2009,2012,2015],{"class":1583,"line":1737},[1581,1991,1606],{"class":1587},[1581,1993,1592],{"class":1591},[1581,1995,1596],{"class":1595},[1581,1997,1599],{"class":1587},[1581,1999,1602],{"class":1591},[1581,2001,2002],{"class":1605},"path",[1581,2004,1602],{"class":1591},[1581,2006,1611],{"class":1587},[1581,2008,1592],{"class":1591},[1581,2010,2011],{"class":1595},"datum",[1581,2013,2014],{"class":1587},"(points)",[1581,2016,1721],{"class":1591},[1530,2018,2019,2020,2023,2024,2026,2027,2029],{},"记忆方法：",[1559,2021,2022],{},"data 配数组（分发），datum 配单值（整体）","。画多个图形用 ",[1534,2025,1958],{},"，画单个整体图形（如一条折线）用 ",[1534,2028,2011],{},"。",[1539,2031],{},[1525,2033,2035],{"id":2034},"enterupdateexit数据和元素的配对","🧱 enter、update、exit：数据和元素的配对",[1530,2037,2038,2041,2042,2045],{},[1534,2039,2040],{},".data()"," 执行的那一刻，D3 会把数据和页面上已有的元素",[1559,2043,2044],{},"按顺序配对","，配对结果只有三种情况。",[1530,2047,2048,2051,2052,2055],{},[1559,2049,2050],{},"情况一：数据比元素多","——多余的数据进 ",[1534,2053,2054],{},"enter"," 区，等着补元素：",[1572,2057,2061],{"className":2058,"code":2060,"language":1890},[2059],"language-text","数据（5 个）: [120] [200] [150] [80] [70]\n元素（2 个）: [rect][rect]\n\n前 2 个配上对  → update（更新已有的）\n后 3 个没人要  → enter（补 3 个 rect）\n",[1534,2062,2060],{"__ignoreMap":1577},[1530,2064,2065,2068,2069,2072],{},[1559,2066,2067],{},"情况二：元素比数据多","——多余的元素进 ",[1534,2070,2071],{},"exit"," 区，等着被删掉：",[1572,2074,2077],{"className":2075,"code":2076,"language":1890},[2059],"数据（3 个）: [120] [200] [150]\n元素（5 个）: [rect][rect][rect][rect][rect]\n\n前 3 个配上对  → update（更新已有的）\n后 2 个多余    → exit（删掉这 2 个 rect）\n",[1534,2078,2076],{"__ignoreMap":1577},[1530,2080,2081,2084,2085,2088],{},[1559,2082,2083],{},"情况三：一样多","——全部进 ",[1534,2086,2087],{},"update"," 区，直接更新即可。",[1530,2090,2091],{},"所以数据更新时的完整动作是三件事，一件都不能少：",[1572,2093,2095],{"className":1574,"code":2094,"language":1576,"meta":1577,"style":1577},"const rects = svg.selectAll('rect').data(data);\n\n// 1. exit：多余的元素删掉\nrects.exit().remove();\n\n// 2. update：已有的元素更新属性\nrects.attr('y', (d) => 300 - d).attr('height', (d) => d);\n\n// 3. enter：新增的数据补上元素\nrects\n    .enter()\n    .append('rect')\n    .attr('x', (d, i) => i * 60)\n    .attr('width', 40)\n    .attr('fill', '#5470c6')\n    .attr('y', (d) => 300 - d)\n    .attr('height', (d) => d);\n",[1534,2096,2097,2134,2138,2143,2164,2168,2174,2238,2243,2249,2255,2266,2285,2322,2343,2371,2403],{"__ignoreMap":1577},[1581,2098,2099,2102,2105,2108,2111,2113,2115,2117,2119,2121,2123,2125,2127,2129,2132],{"class":1583,"line":1584},[1581,2100,2101],{"class":1785},"const",[1581,2103,2104],{"class":1587}," rects ",[1581,2106,2107],{"class":1591},"=",[1581,2109,2110],{"class":1587}," svg",[1581,2112,1592],{"class":1591},[1581,2114,1628],{"class":1595},[1581,2116,1599],{"class":1587},[1581,2118,1602],{"class":1591},[1581,2120,1635],{"class":1605},[1581,2122,1602],{"class":1591},[1581,2124,1611],{"class":1587},[1581,2126,1592],{"class":1591},[1581,2128,1958],{"class":1595},[1581,2130,2131],{"class":1587},"(data)",[1581,2133,1721],{"class":1591},[1581,2135,2136],{"class":1583,"line":1621},[1581,2137,1728],{"emptyLinePlaceholder":1727},[1581,2139,2140],{"class":1583,"line":1724},[1581,2141,2142],{"class":1617},"// 1. exit：多余的元素删掉\n",[1581,2144,2145,2148,2150,2152,2155,2157,2160,2162],{"class":1583,"line":1731},[1581,2146,2147],{"class":1587},"rects",[1581,2149,1592],{"class":1591},[1581,2151,2071],{"class":1595},[1581,2153,2154],{"class":1587},"()",[1581,2156,1592],{"class":1591},[1581,2158,2159],{"class":1595},"remove",[1581,2161,2154],{"class":1587},[1581,2163,1721],{"class":1591},[1581,2165,2166],{"class":1583,"line":1737},[1581,2167,1728],{"emptyLinePlaceholder":1727},[1581,2169,2171],{"class":1583,"line":2170},6,[1581,2172,2173],{"class":1617},"// 2. update：已有的元素更新属性\n",[1581,2175,2177,2179,2181,2183,2185,2187,2190,2192,2194,2196,2198,2200,2202,2205,2208,2211,2213,2215,2217,2219,2222,2224,2226,2228,2230,2232,2234,2236],{"class":1583,"line":2176},7,[1581,2178,2147],{"class":1587},[1581,2180,1592],{"class":1591},[1581,2182,1700],{"class":1595},[1581,2184,1599],{"class":1587},[1581,2186,1602],{"class":1591},[1581,2188,2189],{"class":1605},"y",[1581,2191,1602],{"class":1591},[1581,2193,1712],{"class":1591},[1581,2195,1771],{"class":1591},[1581,2197,1775],{"class":1774},[1581,2199,1611],{"class":1591},[1581,2201,1786],{"class":1785},[1581,2203,2204],{"class":1715}," 300",[1581,2206,2207],{"class":1591}," -",[1581,2209,2210],{"class":1587}," d)",[1581,2212,1592],{"class":1591},[1581,2214,1700],{"class":1595},[1581,2216,1599],{"class":1587},[1581,2218,1602],{"class":1591},[1581,2220,2221],{"class":1605},"height",[1581,2223,1602],{"class":1591},[1581,2225,1712],{"class":1591},[1581,2227,1771],{"class":1591},[1581,2229,1775],{"class":1774},[1581,2231,1611],{"class":1591},[1581,2233,1786],{"class":1785},[1581,2235,2210],{"class":1587},[1581,2237,1721],{"class":1591},[1581,2239,2241],{"class":1583,"line":2240},8,[1581,2242,1728],{"emptyLinePlaceholder":1727},[1581,2244,2246],{"class":1583,"line":2245},9,[1581,2247,2248],{"class":1617},"// 3. enter：新增的数据补上元素\n",[1581,2250,2252],{"class":1583,"line":2251},10,[1581,2253,2254],{"class":1587},"rects\n",[1581,2256,2258,2261,2263],{"class":1583,"line":2257},11,[1581,2259,2260],{"class":1591},"    .",[1581,2262,2054],{"class":1595},[1581,2264,2265],{"class":1587},"()\n",[1581,2267,2269,2271,2274,2276,2278,2280,2282],{"class":1583,"line":2268},12,[1581,2270,2260],{"class":1591},[1581,2272,2273],{"class":1595},"append",[1581,2275,1599],{"class":1587},[1581,2277,1602],{"class":1591},[1581,2279,1635],{"class":1605},[1581,2281,1602],{"class":1591},[1581,2283,2284],{"class":1587},")\n",[1581,2286,2288,2290,2292,2294,2296,2298,2300,2302,2304,2306,2308,2310,2312,2314,2316,2318,2320],{"class":1583,"line":2287},13,[1581,2289,2260],{"class":1591},[1581,2291,1700],{"class":1595},[1581,2293,1599],{"class":1587},[1581,2295,1602],{"class":1591},[1581,2297,1764],{"class":1605},[1581,2299,1602],{"class":1591},[1581,2301,1712],{"class":1591},[1581,2303,1771],{"class":1591},[1581,2305,1775],{"class":1774},[1581,2307,1712],{"class":1591},[1581,2309,1780],{"class":1774},[1581,2311,1611],{"class":1591},[1581,2313,1786],{"class":1785},[1581,2315,1789],{"class":1587},[1581,2317,1792],{"class":1591},[1581,2319,1795],{"class":1715},[1581,2321,2284],{"class":1587},[1581,2323,2325,2327,2329,2331,2333,2335,2337,2339,2341],{"class":1583,"line":2324},14,[1581,2326,2260],{"class":1591},[1581,2328,1700],{"class":1595},[1581,2330,1599],{"class":1587},[1581,2332,1602],{"class":1591},[1581,2334,1707],{"class":1605},[1581,2336,1602],{"class":1591},[1581,2338,1712],{"class":1591},[1581,2340,1716],{"class":1715},[1581,2342,2284],{"class":1587},[1581,2344,2346,2348,2350,2352,2354,2357,2359,2361,2364,2367,2369],{"class":1583,"line":2345},15,[1581,2347,2260],{"class":1591},[1581,2349,1700],{"class":1595},[1581,2351,1599],{"class":1587},[1581,2353,1602],{"class":1591},[1581,2355,2356],{"class":1605},"fill",[1581,2358,1602],{"class":1591},[1581,2360,1712],{"class":1591},[1581,2362,2363],{"class":1591}," '",[1581,2365,2366],{"class":1605},"#5470c6",[1581,2368,1602],{"class":1591},[1581,2370,2284],{"class":1587},[1581,2372,2374,2376,2378,2380,2382,2384,2386,2388,2390,2392,2394,2396,2398,2400],{"class":1583,"line":2373},16,[1581,2375,2260],{"class":1591},[1581,2377,1700],{"class":1595},[1581,2379,1599],{"class":1587},[1581,2381,1602],{"class":1591},[1581,2383,2189],{"class":1605},[1581,2385,1602],{"class":1591},[1581,2387,1712],{"class":1591},[1581,2389,1771],{"class":1591},[1581,2391,1775],{"class":1774},[1581,2393,1611],{"class":1591},[1581,2395,1786],{"class":1785},[1581,2397,2204],{"class":1715},[1581,2399,2207],{"class":1591},[1581,2401,2402],{"class":1587}," d)\n",[1581,2404,2406,2408,2410,2412,2414,2416,2418,2420,2422,2424,2426,2428,2430],{"class":1583,"line":2405},17,[1581,2407,2260],{"class":1591},[1581,2409,1700],{"class":1595},[1581,2411,1599],{"class":1587},[1581,2413,1602],{"class":1591},[1581,2415,2221],{"class":1605},[1581,2417,1602],{"class":1591},[1581,2419,1712],{"class":1591},[1581,2421,1771],{"class":1591},[1581,2423,1775],{"class":1774},[1581,2425,1611],{"class":1591},[1581,2427,1786],{"class":1785},[1581,2429,2210],{"class":1587},[1581,2431,1721],{"class":1591},[1530,2433,2434,2435,2029],{},"记住口诀：",[1559,2436,2437],{},"多余的删、已有的改、新增的补",[2439,2440,2441],"tip",{},[1530,2442,2443,2444,2446],{},"首次渲染时页面一个元素都没有，所有数据都落在 enter 区——这就是上一篇只写 ",[1534,2445,1536],{}," 就能成功的原因，它是三件套的“特殊情况”。",[1539,2448],{},[1525,2450,2452],{"id":2451},"join一行顶三行","🧰 join()：一行顶三行",[1530,2454,2455,2456,2459],{},"每次都写三件套有点啰嗦，D3 v6 之后提供了 ",[1534,2457,2458],{},"join()","，自动把三件事合并：",[1572,2461,2463],{"className":1574,"code":2462,"language":1576,"meta":1577,"style":1577},"svg.selectAll('rect')\n    .data(data)\n    .join('rect') // 自动处理 enter、update、exit\n    .attr('x', (d, i) => i * 60)\n    .attr('width', 40)\n    .attr('fill', '#5470c6')\n    .attr('y', (d) => 300 - d)\n    .attr('height', (d) => d);\n",[1534,2464,2465,2483,2492,2513,2549,2569,2593,2623],{"__ignoreMap":1577},[1581,2466,2467,2469,2471,2473,2475,2477,2479,2481],{"class":1583,"line":1584},[1581,2468,1606],{"class":1587},[1581,2470,1592],{"class":1591},[1581,2472,1628],{"class":1595},[1581,2474,1599],{"class":1587},[1581,2476,1602],{"class":1591},[1581,2478,1635],{"class":1605},[1581,2480,1602],{"class":1591},[1581,2482,2284],{"class":1587},[1581,2484,2485,2487,2489],{"class":1583,"line":1621},[1581,2486,2260],{"class":1591},[1581,2488,1958],{"class":1595},[1581,2490,2491],{"class":1587},"(data)\n",[1581,2493,2494,2496,2499,2501,2503,2505,2507,2510],{"class":1583,"line":1724},[1581,2495,2260],{"class":1591},[1581,2497,2498],{"class":1595},"join",[1581,2500,1599],{"class":1587},[1581,2502,1602],{"class":1591},[1581,2504,1635],{"class":1605},[1581,2506,1602],{"class":1591},[1581,2508,2509],{"class":1587},") ",[1581,2511,2512],{"class":1617},"// 自动处理 enter、update、exit\n",[1581,2514,2515,2517,2519,2521,2523,2525,2527,2529,2531,2533,2535,2537,2539,2541,2543,2545,2547],{"class":1583,"line":1731},[1581,2516,2260],{"class":1591},[1581,2518,1700],{"class":1595},[1581,2520,1599],{"class":1587},[1581,2522,1602],{"class":1591},[1581,2524,1764],{"class":1605},[1581,2526,1602],{"class":1591},[1581,2528,1712],{"class":1591},[1581,2530,1771],{"class":1591},[1581,2532,1775],{"class":1774},[1581,2534,1712],{"class":1591},[1581,2536,1780],{"class":1774},[1581,2538,1611],{"class":1591},[1581,2540,1786],{"class":1785},[1581,2542,1789],{"class":1587},[1581,2544,1792],{"class":1591},[1581,2546,1795],{"class":1715},[1581,2548,2284],{"class":1587},[1581,2550,2551,2553,2555,2557,2559,2561,2563,2565,2567],{"class":1583,"line":1737},[1581,2552,2260],{"class":1591},[1581,2554,1700],{"class":1595},[1581,2556,1599],{"class":1587},[1581,2558,1602],{"class":1591},[1581,2560,1707],{"class":1605},[1581,2562,1602],{"class":1591},[1581,2564,1712],{"class":1591},[1581,2566,1716],{"class":1715},[1581,2568,2284],{"class":1587},[1581,2570,2571,2573,2575,2577,2579,2581,2583,2585,2587,2589,2591],{"class":1583,"line":2170},[1581,2572,2260],{"class":1591},[1581,2574,1700],{"class":1595},[1581,2576,1599],{"class":1587},[1581,2578,1602],{"class":1591},[1581,2580,2356],{"class":1605},[1581,2582,1602],{"class":1591},[1581,2584,1712],{"class":1591},[1581,2586,2363],{"class":1591},[1581,2588,2366],{"class":1605},[1581,2590,1602],{"class":1591},[1581,2592,2284],{"class":1587},[1581,2594,2595,2597,2599,2601,2603,2605,2607,2609,2611,2613,2615,2617,2619,2621],{"class":1583,"line":2176},[1581,2596,2260],{"class":1591},[1581,2598,1700],{"class":1595},[1581,2600,1599],{"class":1587},[1581,2602,1602],{"class":1591},[1581,2604,2189],{"class":1605},[1581,2606,1602],{"class":1591},[1581,2608,1712],{"class":1591},[1581,2610,1771],{"class":1591},[1581,2612,1775],{"class":1774},[1581,2614,1611],{"class":1591},[1581,2616,1786],{"class":1785},[1581,2618,2204],{"class":1715},[1581,2620,2207],{"class":1591},[1581,2622,2402],{"class":1587},[1581,2624,2625,2627,2629,2631,2633,2635,2637,2639,2641,2643,2645,2647,2649],{"class":1583,"line":2240},[1581,2626,2260],{"class":1591},[1581,2628,1700],{"class":1595},[1581,2630,1599],{"class":1587},[1581,2632,1602],{"class":1591},[1581,2634,2221],{"class":1605},[1581,2636,1602],{"class":1591},[1581,2638,1712],{"class":1591},[1581,2640,1771],{"class":1591},[1581,2642,1775],{"class":1774},[1581,2644,1611],{"class":1591},[1581,2646,1786],{"class":1785},[1581,2648,2210],{"class":1587},[1581,2650,1721],{"class":1591},[1530,2652,2653,2654,2657],{},"日常写这一行就够了。但",[1559,2655,2656],{},"一定要先理解背后的三件套","，否则遇到“新增的元素要有入场动画、已有的元素要平滑过渡”这类需求时，就不知道从哪里下手了。",[1539,2659],{},[1525,2661,2663],{"id":2662},"用-key-精确配对","🔑 用 key 精确配对",[1530,2665,2666,2667,2670],{},"默认配对按",[1559,2668,2669],{},"位置顺序","进行，数据会插入、删除时就会出问题。",[1530,2672,2673],{},"举个例子：页面上有 A、B、C 三根柱子，现在从数据中删掉 B。按位置配对时，D3 认为“前两个没变、删掉最后一个”——于是 C 的柱子被删了，B 的柱子改个数据继续冒充 C。虽然总数没错，但柱子和数据错位了。",[1530,2675,2676],{},"给数据指定“身份证”就能精确配对：",[1572,2678,2680],{"className":1574,"code":2679,"language":1576,"meta":1577,"style":1577},"const data = [\n    { id: 'a', value: 120 },\n    { id: 'b', value: 200 },\n    { id: 'c', value: 150 },\n];\n\nsvg.selectAll('rect').data(data, (d) => d.id);\n",[1534,2681,2682,2694,2726,2751,2776,2783,2787],{"__ignoreMap":1577},[1581,2683,2684,2686,2689,2691],{"class":1583,"line":1584},[1581,2685,2101],{"class":1785},[1581,2687,2688],{"class":1587}," data ",[1581,2690,2107],{"class":1591},[1581,2692,2693],{"class":1587}," [\n",[1581,2695,2696,2699,2703,2706,2708,2711,2713,2715,2718,2720,2723],{"class":1583,"line":1621},[1581,2697,2698],{"class":1591},"    {",[1581,2700,2702],{"class":2701},"sd2Uz"," id",[1581,2704,2705],{"class":1591},":",[1581,2707,2363],{"class":1591},[1581,2709,2710],{"class":1605},"a",[1581,2712,1602],{"class":1591},[1581,2714,1712],{"class":1591},[1581,2716,2717],{"class":2701}," value",[1581,2719,2705],{"class":1591},[1581,2721,2722],{"class":1715}," 120",[1581,2724,2725],{"class":1591}," },\n",[1581,2727,2728,2730,2732,2734,2736,2739,2741,2743,2745,2747,2749],{"class":1583,"line":1724},[1581,2729,2698],{"class":1591},[1581,2731,2702],{"class":2701},[1581,2733,2705],{"class":1591},[1581,2735,2363],{"class":1591},[1581,2737,2738],{"class":1605},"b",[1581,2740,1602],{"class":1591},[1581,2742,1712],{"class":1591},[1581,2744,2717],{"class":2701},[1581,2746,2705],{"class":1591},[1581,2748,1968],{"class":1715},[1581,2750,2725],{"class":1591},[1581,2752,2753,2755,2757,2759,2761,2764,2766,2768,2770,2772,2774],{"class":1583,"line":1731},[1581,2754,2698],{"class":1591},[1581,2756,2702],{"class":2701},[1581,2758,2705],{"class":1591},[1581,2760,2363],{"class":1591},[1581,2762,2763],{"class":1605},"c",[1581,2765,1602],{"class":1591},[1581,2767,1712],{"class":1591},[1581,2769,2717],{"class":2701},[1581,2771,2705],{"class":1591},[1581,2773,1973],{"class":1715},[1581,2775,2725],{"class":1591},[1581,2777,2778,2781],{"class":1583,"line":1737},[1581,2779,2780],{"class":1587},"]",[1581,2782,1721],{"class":1591},[1581,2784,2785],{"class":1583,"line":2170},[1581,2786,1728],{"emptyLinePlaceholder":1727},[1581,2788,2789,2791,2793,2795,2797,2799,2801,2803,2805,2807,2809,2812,2814,2816,2818,2820,2822,2825,2827,2830],{"class":1583,"line":2176},[1581,2790,1606],{"class":1587},[1581,2792,1592],{"class":1591},[1581,2794,1628],{"class":1595},[1581,2796,1599],{"class":1587},[1581,2798,1602],{"class":1591},[1581,2800,1635],{"class":1605},[1581,2802,1602],{"class":1591},[1581,2804,1611],{"class":1587},[1581,2806,1592],{"class":1591},[1581,2808,1958],{"class":1595},[1581,2810,2811],{"class":1587},"(data",[1581,2813,1712],{"class":1591},[1581,2815,1771],{"class":1591},[1581,2817,1775],{"class":1774},[1581,2819,1611],{"class":1591},[1581,2821,1786],{"class":1785},[1581,2823,2824],{"class":1587}," d",[1581,2826,1592],{"class":1591},[1581,2828,2829],{"class":1587},"id)",[1581,2831,1721],{"class":1591},[1530,2833,2834,2835,2838,2839,2841,2842,2029],{},"有了 key，D3 就知道走的是 ",[1534,2836,2837],{},"id"," 为 ",[1534,2840,2738],{}," 的那个柱子，增删改全部对号入座。数据是对象数组时，",[1559,2843,2844],{},"建议总是加上 key",[1530,2846,2847],{},"下面的对比演示里，每个 id 有固定颜色（A 蓝、B 红、C 绿）。点击「删除 B」：左边按位置配对时，红色的 B 柱子没有消失，而是改个数据“冒充”了 C；右边按 key 配对时，B 正确离开，C 保持自己的颜色和身份：",[2849,2850],"d3-key-join",{},[1539,2852],{},[1525,2854,2856],{"id":2855},"小节总结","🧾 小节总结",[1549,2858,2859,2867,2875,2883,2886],{},[1552,2860,2861,2863,2864,2866],{},[1534,2862,1596],{}," 抓单个、",[1534,2865,1628],{}," 抓全部，返回可链式调用的选择集。",[1552,2868,2869,2871,2872,2029],{},[1534,2870,1700],{}," 传固定值则所有元素一样；传函数则逐个计算，回调参数是 ",[1534,2873,2874],{},"(d, i)",[1552,2876,2877,2879,2880,2882],{},[1534,2878,1958],{}," 把数组分发给一组元素，",[1534,2881,2011],{}," 把单值整体绑给一个元素。",[1552,2884,2885],{},"配对结果三种：数据多了进 enter（补元素）、元素多了进 exit（删元素）、配上的进 update（改属性）。",[1552,2887,2888,2890,2891,2894],{},[1534,2889,2458],{}," 一行合并三件套；对象数组用 ",[1534,2892,2893],{},".data(data, d => d.id)"," 指定 key 防止错位。",[1539,2896],{},[1525,2898,2900],{"id":2899},"知识问答","❓ 知识问答",[1530,2902,2903],{},[1559,2904,2905],{},"Q1：第一次渲染时元素还不存在，为什么也要 selectAll？",[1530,2907,2908,2909,2911],{},"选不到任何元素也没关系，此时所有数据都落入 enter 区，正好全部走 ",[1534,2910,2273],{}," 创建。这套模板对“从无到有”和“增量更新”是通用的。",[1530,2913,2914],{},[1559,2915,2916],{},"Q2：attr 和 style 都能改外观，怎么选？",[1530,2918,2919,2920,2922,2923,2925,2926,2928],{},"SVG 元素的几何属性（x、y、width、height、fill 等）用 ",[1534,2921,1700],{},"，纯 CSS 层面的样式（如 opacity、cursor）用 ",[1534,2924,1886],{},"。拿不准时用 ",[1534,2927,1700],{},"，SVG 属性基本都归它管。",[1530,2930,2931],{},[1559,2932,2933],{},"Q3：join() 能分别定制三种状态吗？",[1530,2935,2936,2937,2940],{},"可以，传三个函数：",[1534,2938,2939],{},".join(enter => ..., update => ..., exit => ...)","。初学阶段先用字符串形式，后面动画篇会看到它的实际用法。",[1530,2942,2943],{},[1559,2944,2945],{},"Q4：不用 key 会有什么后果？",[1530,2947,2948],{},"数据顺序稳定时没影响。一旦数据会插入、删除、排序，按位置配对会导致图形和数据错位，比如想删 B 柱子结果删成了 C 柱子。",[1539,2950],{},[1525,2952,2954],{"id":2953},"小练习","🧪 小练习",[1530,2956,2957,2958,2961],{},"封装一个 ",[1534,2959,2960],{},"render(data)"," 函数，验证数据的增删改：",[2963,2964,2965,2972,2979],"ol",{},[1552,2966,2967,2968,2971],{},"第一次调用 ",[1534,2969,2970],{},"render([120, 200, 150])","，画出 3 个柱子。",[1552,2973,2974,2975,2978],{},"打开控制台再调用 ",[1534,2976,2977],{},"render([120, 200, 150, 80, 70])","，观察新增 2 个柱子。",[1552,2980,2981,2982,2985],{},"最后调用 ",[1534,2983,2984],{},"render([100, 60])","，观察多余柱子被删掉、剩下的高度更新。",[1572,2987,2989],{"className":1574,"code":2988,"language":1576,"meta":1577,"style":1577},"const svg = d3.select(svgRef.value);\n\nfunction render(data) {\n    // 请在这里编写代码（提示：使用 join 或 enter/update/exit）\n}\n\nrender([120, 200, 150]);\n",[1534,2990,2991,3017,3021,3038,3043,3048,3052],{"__ignoreMap":1577},[1581,2992,2993,2995,2998,3000,3003,3005,3007,3010,3012,3015],{"class":1583,"line":1584},[1581,2994,2101],{"class":1785},[1581,2996,2997],{"class":1587}," svg ",[1581,2999,2107],{"class":1591},[1581,3001,3002],{"class":1587}," d3",[1581,3004,1592],{"class":1591},[1581,3006,1596],{"class":1595},[1581,3008,3009],{"class":1587},"(svgRef",[1581,3011,1592],{"class":1591},[1581,3013,3014],{"class":1587},"value)",[1581,3016,1721],{"class":1591},[1581,3018,3019],{"class":1583,"line":1621},[1581,3020,1728],{"emptyLinePlaceholder":1727},[1581,3022,3023,3026,3029,3031,3033,3035],{"class":1583,"line":1724},[1581,3024,3025],{"class":1785},"function",[1581,3027,3028],{"class":1595}," render",[1581,3030,1599],{"class":1591},[1581,3032,1958],{"class":1774},[1581,3034,1611],{"class":1591},[1581,3036,3037],{"class":1591}," {\n",[1581,3039,3040],{"class":1583,"line":1731},[1581,3041,3042],{"class":1617},"    // 请在这里编写代码（提示：使用 join 或 enter/update/exit）\n",[1581,3044,3045],{"class":1583,"line":1737},[1581,3046,3047],{"class":1591},"}\n",[1581,3049,3050],{"class":1583,"line":2170},[1581,3051,1728],{"emptyLinePlaceholder":1727},[1581,3053,3054,3057,3059,3061,3063,3065,3067,3069,3071],{"class":1583,"line":2176},[1581,3055,3056],{"class":1595},"render",[1581,3058,1961],{"class":1587},[1581,3060,1851],{"class":1715},[1581,3062,1712],{"class":1591},[1581,3064,1968],{"class":1715},[1581,3066,1712],{"class":1591},[1581,3068,1973],{"class":1715},[1581,3070,1976],{"class":1587},[1581,3072,1721],{"class":1591},[1539,3074],{},[1530,3076,3077],{},"🎉 恭喜你已经掌握 D3 最核心的数据绑定机制！下一篇我们学习比例尺，解决“数据值太大画不下”的换算问题。",[1886,3079,3080],{},"html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .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 .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 .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);}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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 .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}",{"title":1577,"searchDepth":1621,"depth":1621,"links":3082},[3083,3084,3085,3086,3087,3088,3089,3090,3091,3092],{"id":1527,"depth":1621,"text":1528},{"id":1543,"depth":1621,"text":1544},{"id":1660,"depth":1621,"text":1661},{"id":1899,"depth":1621,"text":1900},{"id":2034,"depth":1621,"text":2035},{"id":2451,"depth":1621,"text":2452},{"id":2662,"depth":1621,"text":2663},{"id":2855,"depth":1621,"text":2856},{"id":2899,"depth":1621,"text":2900},{"id":2953,"depth":1621,"text":2954},"掌握 D3 选择集和数据绑定的核心机制，学会用 enter、update、exit 处理数据的增删改。","md",null,{},{"title":1049},{"title":1049,"description":3093},"s9MmTc9GXM",[3101,3103],{"title":1043,"path":1044,"stem":1045,"description":3102,"children":-1},"了解 D3 是什么、它和 ECharts 的区别，认识 SVG 画布并画出第一个数据驱动的柱状图。",{"title":1053,"path":1054,"stem":1055,"description":3104,"children":-1},"理解 domain 和 range 的概念，掌握 scaleLinear、scaleBand 和 scaleTime 三种常用比例尺。",1784715113241]