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布局约定，用一行代码画出带刻度的坐标轴，最终完成一个完整规范的柱状图。",[1535,1536],"hr",{},[1526,1538,1540],{"id":1539},"margin-约定给坐标轴留位置","🧱 margin 约定：给坐标轴留位置",[1531,1542,1543,1544,1548],{},"先想一个问题：y 轴刻度“0、50、100”这些数字画在哪里？画在图表内容的",[1545,1546,1547],"strong",{},"左边","。如果柱子贴着 SVG 最左边缘画，刻度数字就被挤到画布外面了。",[1531,1550,1551,1552,1555],{},"解决办法是 D3 社区的通行做法——",[1545,1553,1554],{},"margin 约定","：SVG 四周留出边距，图表内容画在中间的区域里：",[1557,1558,1563],"pre",{"className":1559,"code":1561,"language":1562},[1560],"language-text","┌──────────────────────── svg ────────────────────────┐\n│                    margin.top                        │\n│         ┌───────────────────────────┐                │\n│  margin │                           │  margin.right  │\n│  .left  │     图表内容区（g 容器）    │                │\n│         │                           │                │\n│         └───────────────────────────┘                │\n│                   margin.bottom                      │\n└──────────────────────────────────────────────────────┘\n","text",[1564,1565,1561],"code",{"__ignoreMap":1566},"",[1531,1568,1569,1570,1573,1574,1576],{},"代码实现是固定套路：算好内容区宽高，添加一个 ",[1564,1571,1572],{},"g"," 容器平移到内容区左上角，之后所有图形都画在这个 ",[1564,1575,1572],{}," 里：",[1557,1578,1582],{"className":1579,"code":1580,"language":1581,"meta":1566,"style":1566},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const margin = { top: 20, right: 20, bottom: 30, left: 40 };\nconst width = 480 - margin.left - margin.right; // 内容区宽 420\nconst height = 280 - margin.top - margin.bottom; // 内容区高 230\n\nconst svg = d3\n    .select(svgRef.value)\n    .append('g')\n    .attr('transform', `translate(${margin.left}, ${margin.top})`);\n","js",[1564,1583,1584,1648,1690,1726,1733,1746,1764,1786],{"__ignoreMap":1566},[1585,1586,1589,1593,1597,1601,1604,1608,1611,1615,1618,1621,1623,1625,1627,1630,1632,1635,1637,1640,1642,1645],"span",{"class":1587,"line":1588},"line",1,[1585,1590,1592],{"class":1591},"s50WR","const",[1585,1594,1596],{"class":1595},"sndM8"," margin ",[1585,1598,1600],{"class":1599},"s86vT","=",[1585,1602,1603],{"class":1599}," {",[1585,1605,1607],{"class":1606},"sd2Uz"," top",[1585,1609,1610],{"class":1599},":",[1585,1612,1614],{"class":1613},"smPcV"," 20",[1585,1616,1617],{"class":1599},",",[1585,1619,1620],{"class":1606}," right",[1585,1622,1610],{"class":1599},[1585,1624,1614],{"class":1613},[1585,1626,1617],{"class":1599},[1585,1628,1629],{"class":1606}," bottom",[1585,1631,1610],{"class":1599},[1585,1633,1634],{"class":1613}," 30",[1585,1636,1617],{"class":1599},[1585,1638,1639],{"class":1606}," left",[1585,1641,1610],{"class":1599},[1585,1643,1644],{"class":1613}," 40",[1585,1646,1647],{"class":1599}," };\n",[1585,1649,1651,1653,1656,1658,1661,1664,1667,1670,1673,1676,1678,1680,1683,1686],{"class":1587,"line":1650},2,[1585,1652,1592],{"class":1591},[1585,1654,1655],{"class":1595}," width ",[1585,1657,1600],{"class":1599},[1585,1659,1660],{"class":1613}," 480",[1585,1662,1663],{"class":1599}," -",[1585,1665,1666],{"class":1595}," margin",[1585,1668,1669],{"class":1599},".",[1585,1671,1672],{"class":1595},"left ",[1585,1674,1675],{"class":1599},"-",[1585,1677,1666],{"class":1595},[1585,1679,1669],{"class":1599},[1585,1681,1682],{"class":1595},"right",[1585,1684,1685],{"class":1599},";",[1585,1687,1689],{"class":1688},"syuKq"," // 内容区宽 420\n",[1585,1691,1693,1695,1698,1700,1703,1705,1707,1709,1712,1714,1716,1718,1721,1723],{"class":1587,"line":1692},3,[1585,1694,1592],{"class":1591},[1585,1696,1697],{"class":1595}," height ",[1585,1699,1600],{"class":1599},[1585,1701,1702],{"class":1613}," 280",[1585,1704,1663],{"class":1599},[1585,1706,1666],{"class":1595},[1585,1708,1669],{"class":1599},[1585,1710,1711],{"class":1595},"top ",[1585,1713,1675],{"class":1599},[1585,1715,1666],{"class":1595},[1585,1717,1669],{"class":1599},[1585,1719,1720],{"class":1595},"bottom",[1585,1722,1685],{"class":1599},[1585,1724,1725],{"class":1688}," // 内容区高 230\n",[1585,1727,1729],{"class":1587,"line":1728},4,[1585,1730,1732],{"emptyLinePlaceholder":1731},true,"\n",[1585,1734,1736,1738,1741,1743],{"class":1587,"line":1735},5,[1585,1737,1592],{"class":1591},[1585,1739,1740],{"class":1595}," svg ",[1585,1742,1600],{"class":1599},[1585,1744,1745],{"class":1595}," d3\n",[1585,1747,1749,1752,1756,1759,1761],{"class":1587,"line":1748},6,[1585,1750,1751],{"class":1599},"    .",[1585,1753,1755],{"class":1754},"swgpB","select",[1585,1757,1758],{"class":1595},"(svgRef",[1585,1760,1669],{"class":1599},[1585,1762,1763],{"class":1595},"value)\n",[1585,1765,1767,1769,1772,1775,1778,1781,1783],{"class":1587,"line":1766},7,[1585,1768,1751],{"class":1599},[1585,1770,1771],{"class":1754},"append",[1585,1773,1774],{"class":1595},"(",[1585,1776,1777],{"class":1599},"'",[1585,1779,1572],{"class":1780},"sIEYB",[1585,1782,1777],{"class":1599},[1585,1784,1785],{"class":1595},")\n",[1585,1787,1789,1791,1794,1796,1798,1801,1803,1805,1808,1811,1814,1817,1819,1822,1825,1828,1830,1832,1834,1837,1839,1842,1845,1847],{"class":1587,"line":1788},8,[1585,1790,1751],{"class":1599},[1585,1792,1793],{"class":1754},"attr",[1585,1795,1774],{"class":1595},[1585,1797,1777],{"class":1599},[1585,1799,1800],{"class":1780},"transform",[1585,1802,1777],{"class":1599},[1585,1804,1617],{"class":1599},[1585,1806,1807],{"class":1599}," `",[1585,1809,1810],{"class":1780},"translate(",[1585,1812,1813],{"class":1599},"${",[1585,1815,1816],{"class":1595},"margin",[1585,1818,1669],{"class":1599},[1585,1820,1821],{"class":1595},"left",[1585,1823,1824],{"class":1599},"}",[1585,1826,1827],{"class":1780},", ",[1585,1829,1813],{"class":1599},[1585,1831,1816],{"class":1595},[1585,1833,1669],{"class":1599},[1585,1835,1836],{"class":1595},"top",[1585,1838,1824],{"class":1599},[1585,1840,1841],{"class":1780},")",[1585,1843,1844],{"class":1599},"`",[1585,1846,1841],{"class":1595},[1585,1848,1849],{"class":1599},";\n",[1531,1851,1852,1853,1856,1857,1860,1861,1864],{},"之后比例尺的 range 都基于 ",[1564,1854,1855],{},"width"," 和 ",[1564,1858,1859],{},"height"," 计算，",[1564,1862,1863],{},"(0, 0)"," 就代表内容区左上角，不用操心边距了。",[1531,1866,1867],{},"margin 的作用看对比最直观：有 margin 时刻度完整显示，去掉 margin 后坐标轴直接被画布边缘切掉：",[1869,1870],"d3-margin-demo",{},[1535,1872],{},[1526,1874,1876],{"id":1875},"一行代码画出坐标轴","🧱 一行代码画出坐标轴",[1531,1878,1879,1880,1883],{},"坐标轴上有轴线、刻度线、刻度数字，自己一个个画太麻烦。D3 的坐标轴函数帮我们",[1545,1881,1882],{},"一键生成","，常用的两个：",[1885,1886,1887,1894],"ul",{},[1888,1889,1890,1893],"li",{},[1564,1891,1892],{},"d3.axisBottom(xScale)","：刻度朝下的 x 轴。",[1888,1895,1896,1899],{},[1564,1897,1898],{},"d3.axisLeft(yScale)","：刻度朝左的 y 轴。",[1531,1901,1902,1903,1913],{},"画轴的固定写法：",[1545,1904,1905,1906,1908,1909,1912],{},"添加一个 ",[1564,1907,1572],{},"，平移到正确位置，用 ",[1564,1910,1911],{},"call"," 把轴画进去","：",[1557,1915,1917],{"className":1579,"code":1916,"language":1581,"meta":1566,"style":1566},"// x 轴画在内容区底部\nsvg.append('g')\n    .attr('transform', `translate(0, ${height})`)\n    .call(d3.axisBottom(xScale));\n\n// y 轴画在内容区左侧（g 本身就在左上角，不用平移）\nsvg.append('g').call(d3.axisLeft(yScale));\n",[1564,1918,1919,1924,1943,1976,1995,1999,2004],{"__ignoreMap":1566},[1585,1920,1921],{"class":1587,"line":1588},[1585,1922,1923],{"class":1688},"// x 轴画在内容区底部\n",[1585,1925,1926,1929,1931,1933,1935,1937,1939,1941],{"class":1587,"line":1650},[1585,1927,1928],{"class":1595},"svg",[1585,1930,1669],{"class":1599},[1585,1932,1771],{"class":1754},[1585,1934,1774],{"class":1595},[1585,1936,1777],{"class":1599},[1585,1938,1572],{"class":1780},[1585,1940,1777],{"class":1599},[1585,1942,1785],{"class":1595},[1585,1944,1945,1947,1949,1951,1953,1955,1957,1959,1961,1964,1966,1968,1970,1972,1974],{"class":1587,"line":1692},[1585,1946,1751],{"class":1599},[1585,1948,1793],{"class":1754},[1585,1950,1774],{"class":1595},[1585,1952,1777],{"class":1599},[1585,1954,1800],{"class":1780},[1585,1956,1777],{"class":1599},[1585,1958,1617],{"class":1599},[1585,1960,1807],{"class":1599},[1585,1962,1963],{"class":1780},"translate(0, ",[1585,1965,1813],{"class":1599},[1585,1967,1859],{"class":1595},[1585,1969,1824],{"class":1599},[1585,1971,1841],{"class":1780},[1585,1973,1844],{"class":1599},[1585,1975,1785],{"class":1595},[1585,1977,1978,1980,1982,1985,1987,1990,1993],{"class":1587,"line":1728},[1585,1979,1751],{"class":1599},[1585,1981,1911],{"class":1754},[1585,1983,1984],{"class":1595},"(d3",[1585,1986,1669],{"class":1599},[1585,1988,1989],{"class":1754},"axisBottom",[1585,1991,1992],{"class":1595},"(xScale))",[1585,1994,1849],{"class":1599},[1585,1996,1997],{"class":1587,"line":1735},[1585,1998,1732],{"emptyLinePlaceholder":1731},[1585,2000,2001],{"class":1587,"line":1748},[1585,2002,2003],{"class":1688},"// y 轴画在内容区左侧（g 本身就在左上角，不用平移）\n",[1585,2005,2006,2008,2010,2012,2014,2016,2018,2020,2022,2024,2026,2028,2030,2033,2036],{"class":1587,"line":1766},[1585,2007,1928],{"class":1595},[1585,2009,1669],{"class":1599},[1585,2011,1771],{"class":1754},[1585,2013,1774],{"class":1595},[1585,2015,1777],{"class":1599},[1585,2017,1572],{"class":1780},[1585,2019,1777],{"class":1599},[1585,2021,1841],{"class":1595},[1585,2023,1669],{"class":1599},[1585,2025,1911],{"class":1754},[1585,2027,1984],{"class":1595},[1585,2029,1669],{"class":1599},[1585,2031,2032],{"class":1754},"axisLeft",[1585,2034,2035],{"class":1595},"(yScale))",[1585,2037,1849],{"class":1599},[1531,2039,2040,2042,2043,2045,2046,2048],{},[1564,2041,1911],{}," 的意思是“把当前选中的 ",[1564,2044,1572],{}," 交给坐标轴函数处理”。执行之后，D3 会在 ",[1564,2047,1572],{}," 里自动生成一堆子元素，大致长这样：",[1557,2050,2053],{"className":2051,"code":2052,"language":1562},[1560],"g（坐标轴）\n├── 轴线（一条横线）\n├── 刻度组 1：小竖线 + 文字“周一”\n├── 刻度组 2：小竖线 + 文字“周二”\n└── ……\n",[1564,2054,2052],{"__ignoreMap":1566},[1531,2056,2057],{},"刻度的位置、数字全都根据比例尺自动算好，这就是比例尺和坐标轴配合的方式。",[1531,2059,2060,2061,2064],{},"亲自点一下：按钮执行的就是 ",[1564,2062,2063],{},"call(d3.axisBottom(xScale))"," 这行代码，坐标轴瞬间生成：",[2066,2067],"d3-axis-call-demo",{},[1535,2069],{},[1526,2071,2073],{"id":2072},"定制刻度","🧱 定制刻度",[1531,2075,2076],{},"坐标轴生成后还能调整：",[1557,2078,2080],{"className":1579,"code":2079,"language":1581,"meta":1566,"style":1566},"d3.axisLeft(yScale)\n    .ticks(5) // 期望 5 个刻度\n    .tickFormat((d) => `${d}件`); // 刻度文字加个单位\n",[1564,2081,2082,2094,2112],{"__ignoreMap":1566},[1585,2083,2084,2087,2089,2091],{"class":1587,"line":1588},[1585,2085,2086],{"class":1595},"d3",[1585,2088,1669],{"class":1599},[1585,2090,2032],{"class":1754},[1585,2092,2093],{"class":1595},"(yScale)\n",[1585,2095,2096,2098,2101,2103,2106,2109],{"class":1587,"line":1650},[1585,2097,1751],{"class":1599},[1585,2099,2100],{"class":1754},"ticks",[1585,2102,1774],{"class":1595},[1585,2104,2105],{"class":1613},"5",[1585,2107,2108],{"class":1595},") ",[1585,2110,2111],{"class":1688},"// 期望 5 个刻度\n",[1585,2113,2114,2116,2119,2121,2123,2127,2129,2132,2135,2137,2139,2142,2144,2146,2148],{"class":1587,"line":1692},[1585,2115,1751],{"class":1599},[1585,2117,2118],{"class":1754},"tickFormat",[1585,2120,1774],{"class":1595},[1585,2122,1774],{"class":1599},[1585,2124,2126],{"class":2125},"sK9QF","d",[1585,2128,1841],{"class":1599},[1585,2130,2131],{"class":1591}," =>",[1585,2133,2134],{"class":1599}," `${",[1585,2136,2126],{"class":1595},[1585,2138,1824],{"class":1599},[1585,2140,2141],{"class":1780},"件",[1585,2143,1844],{"class":1599},[1585,2145,1841],{"class":1595},[1585,2147,1685],{"class":1599},[1585,2149,2150],{"class":1688}," // 刻度文字加个单位\n",[1885,2152,2153,2159],{},[1888,2154,2155,2158],{},[1564,2156,2157],{},".ticks(5)","：告诉 D3 大约要 5 个刻度，它会自动选出整齐的间隔。",[1888,2160,2161,2164],{},[1564,2162,2163],{},".tickFormat()","：自定义刻度文字，比如给数字加上单位。",[1531,2166,2167],{},"对比默认刻度和定制刻度的实际效果：",[2169,2170],"d3-tick-demo",{},[1535,2172],{},[1526,2174,2176],{"id":2175},"完整柱状图","🛠 完整柱状图",[1531,2178,2179],{},"把 margin、比例尺、坐标轴、数据绑定全部组合起来：",[1557,2181,2186],{"className":2182,"code":2183,"filename":2184,"language":2185,"meta":1566,"style":1566},"language-vue shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Ctemplate>\n    \u003Csvg ref=\"svgRef\" class=\"chart\">\u003C/svg>\n\u003C/template>\n\n\u003Cscript setup>\nimport { onMounted, ref } from 'vue';\nimport * as d3 from 'd3';\n\nconst svgRef = ref(null);\n\nconst data = [\n    { day: '周一', value: 120 },\n    { day: '周二', value: 200 },\n    { day: '周三', value: 150 },\n    { day: '周四', value: 80 },\n    { day: '周五', value: 70 },\n];\n\nonMounted(() => {\n    const margin = { top: 20, right: 20, bottom: 30, left: 40 };\n    const width = 480 - margin.left - margin.right;\n    const height = 280 - margin.top - margin.bottom;\n\n    const svg = d3\n        .select(svgRef.value)\n        .append('g')\n        .attr('transform', `translate(${margin.left}, ${margin.top})`);\n\n    // x 轴比例尺：分类\n    const xScale = d3\n        .scaleBand()\n        .domain(data.map((d) => d.day))\n        .range([0, width])\n        .padding(0.2);\n\n    // y 轴比例尺：数值\n    const yScale = d3\n        .scaleLinear()\n        .domain([0, d3.max(data, (d) => d.value)])\n        .range([height, 0])\n        .nice();\n\n    // 画柱子\n    svg.selectAll('rect')\n        .data(data)\n        .join('rect')\n        .attr('x', (d) => xScale(d.day))\n        .attr('y', (d) => yScale(d.value))\n        .attr('width', xScale.bandwidth())\n        .attr('height', (d) => height - yScale(d.value))\n        .attr('fill', '#5470c6');\n\n    // 画坐标轴\n    svg.append('g')\n        .attr('transform', `translate(0, ${height})`)\n        .call(d3.axisBottom(xScale));\n\n    svg.append('g').call(d3.axisLeft(yScale));\n});\n\u003C/script>\n\n\u003Cstyle scoped>\n.chart {\n    width: 480px;\n    height: 280px;\n}\n\u003C/style>\n","views/BarChart.vue","vue",[1564,2187,2188,2199,2238,2247,2251,2263,2293,2317,2321,2342,2347,2360,2391,2418,2445,2472,2499,2507,2512,2528,2573,2603,2633,2638,2650,2669,2686,2737,2742,2748,2760,2771,2810,2831,2848,2853,2859,2871,2881,2926,2944,2956,2961,2967,2989,3002,3020,3058,3096,3123,3164,3193,3198,3204,3223,3256,3281,3286,3326,3335,3344,3349,3362,3372,3386,3399,3405],{"__ignoreMap":1566},[1585,2189,2190,2193,2196],{"class":1587,"line":1588},[1585,2191,2192],{"class":1599},"\u003C",[1585,2194,2195],{"class":1606},"template",[1585,2197,2198],{"class":1599},">\n",[1585,2200,2201,2204,2206,2209,2211,2214,2217,2219,2222,2224,2226,2229,2231,2234,2236],{"class":1587,"line":1650},[1585,2202,2203],{"class":1599},"    \u003C",[1585,2205,1928],{"class":1606},[1585,2207,2208],{"class":1591}," ref",[1585,2210,1600],{"class":1599},[1585,2212,2213],{"class":1599},"\"",[1585,2215,2216],{"class":1780},"svgRef",[1585,2218,2213],{"class":1599},[1585,2220,2221],{"class":1591}," class",[1585,2223,1600],{"class":1599},[1585,2225,2213],{"class":1599},[1585,2227,2228],{"class":1780},"chart",[1585,2230,2213],{"class":1599},[1585,2232,2233],{"class":1599},">\u003C/",[1585,2235,1928],{"class":1606},[1585,2237,2198],{"class":1599},[1585,2239,2240,2243,2245],{"class":1587,"line":1692},[1585,2241,2242],{"class":1599},"\u003C/",[1585,2244,2195],{"class":1606},[1585,2246,2198],{"class":1599},[1585,2248,2249],{"class":1587,"line":1728},[1585,2250,1732],{"emptyLinePlaceholder":1731},[1585,2252,2253,2255,2258,2261],{"class":1587,"line":1735},[1585,2254,2192],{"class":1599},[1585,2256,2257],{"class":1606},"script",[1585,2259,2260],{"class":1591}," setup",[1585,2262,2198],{"class":1599},[1585,2264,2265,2269,2271,2274,2276,2278,2281,2284,2287,2289,2291],{"class":1587,"line":1748},[1585,2266,2268],{"class":2267},"s8pZq","import",[1585,2270,1603],{"class":1599},[1585,2272,2273],{"class":1595}," onMounted",[1585,2275,1617],{"class":1599},[1585,2277,2208],{"class":1595},[1585,2279,2280],{"class":1599}," }",[1585,2282,2283],{"class":2267}," from",[1585,2285,2286],{"class":1599}," '",[1585,2288,2185],{"class":1780},[1585,2290,1777],{"class":1599},[1585,2292,1849],{"class":1599},[1585,2294,2295,2297,2300,2303,2306,2309,2311,2313,2315],{"class":1587,"line":1766},[1585,2296,2268],{"class":2267},[1585,2298,2299],{"class":1599}," *",[1585,2301,2302],{"class":2267}," as",[1585,2304,2305],{"class":1595}," d3 ",[1585,2307,2308],{"class":2267},"from",[1585,2310,2286],{"class":1599},[1585,2312,2086],{"class":1780},[1585,2314,1777],{"class":1599},[1585,2316,1849],{"class":1599},[1585,2318,2319],{"class":1587,"line":1788},[1585,2320,1732],{"emptyLinePlaceholder":1731},[1585,2322,2324,2326,2329,2331,2333,2335,2338,2340],{"class":1587,"line":2323},9,[1585,2325,1592],{"class":1591},[1585,2327,2328],{"class":1595}," svgRef ",[1585,2330,1600],{"class":1599},[1585,2332,2208],{"class":1754},[1585,2334,1774],{"class":1595},[1585,2336,2337],{"class":1599},"null",[1585,2339,1841],{"class":1595},[1585,2341,1849],{"class":1599},[1585,2343,2345],{"class":1587,"line":2344},10,[1585,2346,1732],{"emptyLinePlaceholder":1731},[1585,2348,2350,2352,2355,2357],{"class":1587,"line":2349},11,[1585,2351,1592],{"class":1591},[1585,2353,2354],{"class":1595}," data ",[1585,2356,1600],{"class":1599},[1585,2358,2359],{"class":1595}," [\n",[1585,2361,2363,2366,2369,2371,2373,2376,2378,2380,2383,2385,2388],{"class":1587,"line":2362},12,[1585,2364,2365],{"class":1599},"    {",[1585,2367,2368],{"class":1606}," day",[1585,2370,1610],{"class":1599},[1585,2372,2286],{"class":1599},[1585,2374,2375],{"class":1780},"周一",[1585,2377,1777],{"class":1599},[1585,2379,1617],{"class":1599},[1585,2381,2382],{"class":1606}," value",[1585,2384,1610],{"class":1599},[1585,2386,2387],{"class":1613}," 120",[1585,2389,2390],{"class":1599}," },\n",[1585,2392,2394,2396,2398,2400,2402,2405,2407,2409,2411,2413,2416],{"class":1587,"line":2393},13,[1585,2395,2365],{"class":1599},[1585,2397,2368],{"class":1606},[1585,2399,1610],{"class":1599},[1585,2401,2286],{"class":1599},[1585,2403,2404],{"class":1780},"周二",[1585,2406,1777],{"class":1599},[1585,2408,1617],{"class":1599},[1585,2410,2382],{"class":1606},[1585,2412,1610],{"class":1599},[1585,2414,2415],{"class":1613}," 200",[1585,2417,2390],{"class":1599},[1585,2419,2421,2423,2425,2427,2429,2432,2434,2436,2438,2440,2443],{"class":1587,"line":2420},14,[1585,2422,2365],{"class":1599},[1585,2424,2368],{"class":1606},[1585,2426,1610],{"class":1599},[1585,2428,2286],{"class":1599},[1585,2430,2431],{"class":1780},"周三",[1585,2433,1777],{"class":1599},[1585,2435,1617],{"class":1599},[1585,2437,2382],{"class":1606},[1585,2439,1610],{"class":1599},[1585,2441,2442],{"class":1613}," 150",[1585,2444,2390],{"class":1599},[1585,2446,2448,2450,2452,2454,2456,2459,2461,2463,2465,2467,2470],{"class":1587,"line":2447},15,[1585,2449,2365],{"class":1599},[1585,2451,2368],{"class":1606},[1585,2453,1610],{"class":1599},[1585,2455,2286],{"class":1599},[1585,2457,2458],{"class":1780},"周四",[1585,2460,1777],{"class":1599},[1585,2462,1617],{"class":1599},[1585,2464,2382],{"class":1606},[1585,2466,1610],{"class":1599},[1585,2468,2469],{"class":1613}," 80",[1585,2471,2390],{"class":1599},[1585,2473,2475,2477,2479,2481,2483,2486,2488,2490,2492,2494,2497],{"class":1587,"line":2474},16,[1585,2476,2365],{"class":1599},[1585,2478,2368],{"class":1606},[1585,2480,1610],{"class":1599},[1585,2482,2286],{"class":1599},[1585,2484,2485],{"class":1780},"周五",[1585,2487,1777],{"class":1599},[1585,2489,1617],{"class":1599},[1585,2491,2382],{"class":1606},[1585,2493,1610],{"class":1599},[1585,2495,2496],{"class":1613}," 70",[1585,2498,2390],{"class":1599},[1585,2500,2502,2505],{"class":1587,"line":2501},17,[1585,2503,2504],{"class":1595},"]",[1585,2506,1849],{"class":1599},[1585,2508,2510],{"class":1587,"line":2509},18,[1585,2511,1732],{"emptyLinePlaceholder":1731},[1585,2513,2515,2518,2520,2523,2525],{"class":1587,"line":2514},19,[1585,2516,2517],{"class":1754},"onMounted",[1585,2519,1774],{"class":1595},[1585,2521,2522],{"class":1599},"()",[1585,2524,2131],{"class":1591},[1585,2526,2527],{"class":1599}," {\n",[1585,2529,2531,2534,2536,2539,2541,2543,2545,2547,2549,2551,2553,2555,2557,2559,2561,2563,2565,2567,2569,2571],{"class":1587,"line":2530},20,[1585,2532,2533],{"class":1591},"    const",[1585,2535,1666],{"class":1595},[1585,2537,2538],{"class":1599}," =",[1585,2540,1603],{"class":1599},[1585,2542,1607],{"class":1606},[1585,2544,1610],{"class":1599},[1585,2546,1614],{"class":1613},[1585,2548,1617],{"class":1599},[1585,2550,1620],{"class":1606},[1585,2552,1610],{"class":1599},[1585,2554,1614],{"class":1613},[1585,2556,1617],{"class":1599},[1585,2558,1629],{"class":1606},[1585,2560,1610],{"class":1599},[1585,2562,1634],{"class":1613},[1585,2564,1617],{"class":1599},[1585,2566,1639],{"class":1606},[1585,2568,1610],{"class":1599},[1585,2570,1644],{"class":1613},[1585,2572,1647],{"class":1599},[1585,2574,2576,2578,2581,2583,2585,2587,2589,2591,2593,2595,2597,2599,2601],{"class":1587,"line":2575},21,[1585,2577,2533],{"class":1591},[1585,2579,2580],{"class":1595}," width",[1585,2582,2538],{"class":1599},[1585,2584,1660],{"class":1613},[1585,2586,1663],{"class":1599},[1585,2588,1666],{"class":1595},[1585,2590,1669],{"class":1599},[1585,2592,1821],{"class":1595},[1585,2594,1663],{"class":1599},[1585,2596,1666],{"class":1595},[1585,2598,1669],{"class":1599},[1585,2600,1682],{"class":1595},[1585,2602,1849],{"class":1599},[1585,2604,2606,2608,2611,2613,2615,2617,2619,2621,2623,2625,2627,2629,2631],{"class":1587,"line":2605},22,[1585,2607,2533],{"class":1591},[1585,2609,2610],{"class":1595}," height",[1585,2612,2538],{"class":1599},[1585,2614,1702],{"class":1613},[1585,2616,1663],{"class":1599},[1585,2618,1666],{"class":1595},[1585,2620,1669],{"class":1599},[1585,2622,1836],{"class":1595},[1585,2624,1663],{"class":1599},[1585,2626,1666],{"class":1595},[1585,2628,1669],{"class":1599},[1585,2630,1720],{"class":1595},[1585,2632,1849],{"class":1599},[1585,2634,2636],{"class":1587,"line":2635},23,[1585,2637,1732],{"emptyLinePlaceholder":1731},[1585,2639,2641,2643,2646,2648],{"class":1587,"line":2640},24,[1585,2642,2533],{"class":1591},[1585,2644,2645],{"class":1595}," svg",[1585,2647,2538],{"class":1599},[1585,2649,1745],{"class":1595},[1585,2651,2653,2656,2658,2660,2662,2664,2667],{"class":1587,"line":2652},25,[1585,2654,2655],{"class":1599},"        .",[1585,2657,1755],{"class":1754},[1585,2659,1774],{"class":1606},[1585,2661,2216],{"class":1595},[1585,2663,1669],{"class":1599},[1585,2665,2666],{"class":1595},"value",[1585,2668,1785],{"class":1606},[1585,2670,2672,2674,2676,2678,2680,2682,2684],{"class":1587,"line":2671},26,[1585,2673,2655],{"class":1599},[1585,2675,1771],{"class":1754},[1585,2677,1774],{"class":1606},[1585,2679,1777],{"class":1599},[1585,2681,1572],{"class":1780},[1585,2683,1777],{"class":1599},[1585,2685,1785],{"class":1606},[1585,2687,2689,2691,2693,2695,2697,2699,2701,2703,2705,2707,2709,2711,2713,2715,2717,2719,2721,2723,2725,2727,2729,2731,2733,2735],{"class":1587,"line":2688},27,[1585,2690,2655],{"class":1599},[1585,2692,1793],{"class":1754},[1585,2694,1774],{"class":1606},[1585,2696,1777],{"class":1599},[1585,2698,1800],{"class":1780},[1585,2700,1777],{"class":1599},[1585,2702,1617],{"class":1599},[1585,2704,1807],{"class":1599},[1585,2706,1810],{"class":1780},[1585,2708,1813],{"class":1599},[1585,2710,1816],{"class":1595},[1585,2712,1669],{"class":1599},[1585,2714,1821],{"class":1595},[1585,2716,1824],{"class":1599},[1585,2718,1827],{"class":1780},[1585,2720,1813],{"class":1599},[1585,2722,1816],{"class":1595},[1585,2724,1669],{"class":1599},[1585,2726,1836],{"class":1595},[1585,2728,1824],{"class":1599},[1585,2730,1841],{"class":1780},[1585,2732,1844],{"class":1599},[1585,2734,1841],{"class":1606},[1585,2736,1849],{"class":1599},[1585,2738,2740],{"class":1587,"line":2739},28,[1585,2741,1732],{"emptyLinePlaceholder":1731},[1585,2743,2745],{"class":1587,"line":2744},29,[1585,2746,2747],{"class":1688},"    // x 轴比例尺：分类\n",[1585,2749,2751,2753,2756,2758],{"class":1587,"line":2750},30,[1585,2752,2533],{"class":1591},[1585,2754,2755],{"class":1595}," xScale",[1585,2757,2538],{"class":1599},[1585,2759,1745],{"class":1595},[1585,2761,2763,2765,2768],{"class":1587,"line":2762},31,[1585,2764,2655],{"class":1599},[1585,2766,2767],{"class":1754},"scaleBand",[1585,2769,2770],{"class":1606},"()\n",[1585,2772,2774,2776,2779,2781,2784,2786,2789,2791,2793,2795,2797,2799,2802,2804,2807],{"class":1587,"line":2773},32,[1585,2775,2655],{"class":1599},[1585,2777,2778],{"class":1754},"domain",[1585,2780,1774],{"class":1606},[1585,2782,2783],{"class":1595},"data",[1585,2785,1669],{"class":1599},[1585,2787,2788],{"class":1754},"map",[1585,2790,1774],{"class":1606},[1585,2792,1774],{"class":1599},[1585,2794,2126],{"class":2125},[1585,2796,1841],{"class":1599},[1585,2798,2131],{"class":1591},[1585,2800,2801],{"class":1595}," d",[1585,2803,1669],{"class":1599},[1585,2805,2806],{"class":1595},"day",[1585,2808,2809],{"class":1606},"))\n",[1585,2811,2813,2815,2818,2821,2824,2826,2828],{"class":1587,"line":2812},33,[1585,2814,2655],{"class":1599},[1585,2816,2817],{"class":1754},"range",[1585,2819,2820],{"class":1606},"([",[1585,2822,2823],{"class":1613},"0",[1585,2825,1617],{"class":1599},[1585,2827,2580],{"class":1595},[1585,2829,2830],{"class":1606},"])\n",[1585,2832,2834,2836,2839,2841,2844,2846],{"class":1587,"line":2833},34,[1585,2835,2655],{"class":1599},[1585,2837,2838],{"class":1754},"padding",[1585,2840,1774],{"class":1606},[1585,2842,2843],{"class":1613},"0.2",[1585,2845,1841],{"class":1606},[1585,2847,1849],{"class":1599},[1585,2849,2851],{"class":1587,"line":2850},35,[1585,2852,1732],{"emptyLinePlaceholder":1731},[1585,2854,2856],{"class":1587,"line":2855},36,[1585,2857,2858],{"class":1688},"    // y 轴比例尺：数值\n",[1585,2860,2862,2864,2867,2869],{"class":1587,"line":2861},37,[1585,2863,2533],{"class":1591},[1585,2865,2866],{"class":1595}," yScale",[1585,2868,2538],{"class":1599},[1585,2870,1745],{"class":1595},[1585,2872,2874,2876,2879],{"class":1587,"line":2873},38,[1585,2875,2655],{"class":1599},[1585,2877,2878],{"class":1754},"scaleLinear",[1585,2880,2770],{"class":1606},[1585,2882,2884,2886,2888,2890,2892,2894,2897,2899,2902,2904,2906,2908,2911,2913,2915,2917,2919,2921,2923],{"class":1587,"line":2883},39,[1585,2885,2655],{"class":1599},[1585,2887,2778],{"class":1754},[1585,2889,2820],{"class":1606},[1585,2891,2823],{"class":1613},[1585,2893,1617],{"class":1599},[1585,2895,2896],{"class":1595}," d3",[1585,2898,1669],{"class":1599},[1585,2900,2901],{"class":1754},"max",[1585,2903,1774],{"class":1606},[1585,2905,2783],{"class":1595},[1585,2907,1617],{"class":1599},[1585,2909,2910],{"class":1599}," (",[1585,2912,2126],{"class":2125},[1585,2914,1841],{"class":1599},[1585,2916,2131],{"class":1591},[1585,2918,2801],{"class":1595},[1585,2920,1669],{"class":1599},[1585,2922,2666],{"class":1595},[1585,2924,2925],{"class":1606},")])\n",[1585,2927,2929,2931,2933,2935,2937,2939,2942],{"class":1587,"line":2928},40,[1585,2930,2655],{"class":1599},[1585,2932,2817],{"class":1754},[1585,2934,2820],{"class":1606},[1585,2936,1859],{"class":1595},[1585,2938,1617],{"class":1599},[1585,2940,2941],{"class":1613}," 0",[1585,2943,2830],{"class":1606},[1585,2945,2947,2949,2952,2954],{"class":1587,"line":2946},41,[1585,2948,2655],{"class":1599},[1585,2950,2951],{"class":1754},"nice",[1585,2953,2522],{"class":1606},[1585,2955,1849],{"class":1599},[1585,2957,2959],{"class":1587,"line":2958},42,[1585,2960,1732],{"emptyLinePlaceholder":1731},[1585,2962,2964],{"class":1587,"line":2963},43,[1585,2965,2966],{"class":1688},"    // 画柱子\n",[1585,2968,2970,2973,2975,2978,2980,2982,2985,2987],{"class":1587,"line":2969},44,[1585,2971,2972],{"class":1595},"    svg",[1585,2974,1669],{"class":1599},[1585,2976,2977],{"class":1754},"selectAll",[1585,2979,1774],{"class":1606},[1585,2981,1777],{"class":1599},[1585,2983,2984],{"class":1780},"rect",[1585,2986,1777],{"class":1599},[1585,2988,1785],{"class":1606},[1585,2990,2992,2994,2996,2998,3000],{"class":1587,"line":2991},45,[1585,2993,2655],{"class":1599},[1585,2995,2783],{"class":1754},[1585,2997,1774],{"class":1606},[1585,2999,2783],{"class":1595},[1585,3001,1785],{"class":1606},[1585,3003,3005,3007,3010,3012,3014,3016,3018],{"class":1587,"line":3004},46,[1585,3006,2655],{"class":1599},[1585,3008,3009],{"class":1754},"join",[1585,3011,1774],{"class":1606},[1585,3013,1777],{"class":1599},[1585,3015,2984],{"class":1780},[1585,3017,1777],{"class":1599},[1585,3019,1785],{"class":1606},[1585,3021,3023,3025,3027,3029,3031,3034,3036,3038,3040,3042,3044,3046,3048,3050,3052,3054,3056],{"class":1587,"line":3022},47,[1585,3024,2655],{"class":1599},[1585,3026,1793],{"class":1754},[1585,3028,1774],{"class":1606},[1585,3030,1777],{"class":1599},[1585,3032,3033],{"class":1780},"x",[1585,3035,1777],{"class":1599},[1585,3037,1617],{"class":1599},[1585,3039,2910],{"class":1599},[1585,3041,2126],{"class":2125},[1585,3043,1841],{"class":1599},[1585,3045,2131],{"class":1591},[1585,3047,2755],{"class":1754},[1585,3049,1774],{"class":1606},[1585,3051,2126],{"class":1595},[1585,3053,1669],{"class":1599},[1585,3055,2806],{"class":1595},[1585,3057,2809],{"class":1606},[1585,3059,3061,3063,3065,3067,3069,3072,3074,3076,3078,3080,3082,3084,3086,3088,3090,3092,3094],{"class":1587,"line":3060},48,[1585,3062,2655],{"class":1599},[1585,3064,1793],{"class":1754},[1585,3066,1774],{"class":1606},[1585,3068,1777],{"class":1599},[1585,3070,3071],{"class":1780},"y",[1585,3073,1777],{"class":1599},[1585,3075,1617],{"class":1599},[1585,3077,2910],{"class":1599},[1585,3079,2126],{"class":2125},[1585,3081,1841],{"class":1599},[1585,3083,2131],{"class":1591},[1585,3085,2866],{"class":1754},[1585,3087,1774],{"class":1606},[1585,3089,2126],{"class":1595},[1585,3091,1669],{"class":1599},[1585,3093,2666],{"class":1595},[1585,3095,2809],{"class":1606},[1585,3097,3099,3101,3103,3105,3107,3109,3111,3113,3115,3117,3120],{"class":1587,"line":3098},49,[1585,3100,2655],{"class":1599},[1585,3102,1793],{"class":1754},[1585,3104,1774],{"class":1606},[1585,3106,1777],{"class":1599},[1585,3108,1855],{"class":1780},[1585,3110,1777],{"class":1599},[1585,3112,1617],{"class":1599},[1585,3114,2755],{"class":1595},[1585,3116,1669],{"class":1599},[1585,3118,3119],{"class":1754},"bandwidth",[1585,3121,3122],{"class":1606},"())\n",[1585,3124,3126,3128,3130,3132,3134,3136,3138,3140,3142,3144,3146,3148,3150,3152,3154,3156,3158,3160,3162],{"class":1587,"line":3125},50,[1585,3127,2655],{"class":1599},[1585,3129,1793],{"class":1754},[1585,3131,1774],{"class":1606},[1585,3133,1777],{"class":1599},[1585,3135,1859],{"class":1780},[1585,3137,1777],{"class":1599},[1585,3139,1617],{"class":1599},[1585,3141,2910],{"class":1599},[1585,3143,2126],{"class":2125},[1585,3145,1841],{"class":1599},[1585,3147,2131],{"class":1591},[1585,3149,2610],{"class":1595},[1585,3151,1663],{"class":1599},[1585,3153,2866],{"class":1754},[1585,3155,1774],{"class":1606},[1585,3157,2126],{"class":1595},[1585,3159,1669],{"class":1599},[1585,3161,2666],{"class":1595},[1585,3163,2809],{"class":1606},[1585,3165,3167,3169,3171,3173,3175,3178,3180,3182,3184,3187,3189,3191],{"class":1587,"line":3166},51,[1585,3168,2655],{"class":1599},[1585,3170,1793],{"class":1754},[1585,3172,1774],{"class":1606},[1585,3174,1777],{"class":1599},[1585,3176,3177],{"class":1780},"fill",[1585,3179,1777],{"class":1599},[1585,3181,1617],{"class":1599},[1585,3183,2286],{"class":1599},[1585,3185,3186],{"class":1780},"#5470c6",[1585,3188,1777],{"class":1599},[1585,3190,1841],{"class":1606},[1585,3192,1849],{"class":1599},[1585,3194,3196],{"class":1587,"line":3195},52,[1585,3197,1732],{"emptyLinePlaceholder":1731},[1585,3199,3201],{"class":1587,"line":3200},53,[1585,3202,3203],{"class":1688},"    // 画坐标轴\n",[1585,3205,3207,3209,3211,3213,3215,3217,3219,3221],{"class":1587,"line":3206},54,[1585,3208,2972],{"class":1595},[1585,3210,1669],{"class":1599},[1585,3212,1771],{"class":1754},[1585,3214,1774],{"class":1606},[1585,3216,1777],{"class":1599},[1585,3218,1572],{"class":1780},[1585,3220,1777],{"class":1599},[1585,3222,1785],{"class":1606},[1585,3224,3226,3228,3230,3232,3234,3236,3238,3240,3242,3244,3246,3248,3250,3252,3254],{"class":1587,"line":3225},55,[1585,3227,2655],{"class":1599},[1585,3229,1793],{"class":1754},[1585,3231,1774],{"class":1606},[1585,3233,1777],{"class":1599},[1585,3235,1800],{"class":1780},[1585,3237,1777],{"class":1599},[1585,3239,1617],{"class":1599},[1585,3241,1807],{"class":1599},[1585,3243,1963],{"class":1780},[1585,3245,1813],{"class":1599},[1585,3247,1859],{"class":1595},[1585,3249,1824],{"class":1599},[1585,3251,1841],{"class":1780},[1585,3253,1844],{"class":1599},[1585,3255,1785],{"class":1606},[1585,3257,3259,3261,3263,3265,3267,3269,3271,3273,3276,3279],{"class":1587,"line":3258},56,[1585,3260,2655],{"class":1599},[1585,3262,1911],{"class":1754},[1585,3264,1774],{"class":1606},[1585,3266,2086],{"class":1595},[1585,3268,1669],{"class":1599},[1585,3270,1989],{"class":1754},[1585,3272,1774],{"class":1606},[1585,3274,3275],{"class":1595},"xScale",[1585,3277,3278],{"class":1606},"))",[1585,3280,1849],{"class":1599},[1585,3282,3284],{"class":1587,"line":3283},57,[1585,3285,1732],{"emptyLinePlaceholder":1731},[1585,3287,3289,3291,3293,3295,3297,3299,3301,3303,3305,3307,3309,3311,3313,3315,3317,3319,3322,3324],{"class":1587,"line":3288},58,[1585,3290,2972],{"class":1595},[1585,3292,1669],{"class":1599},[1585,3294,1771],{"class":1754},[1585,3296,1774],{"class":1606},[1585,3298,1777],{"class":1599},[1585,3300,1572],{"class":1780},[1585,3302,1777],{"class":1599},[1585,3304,1841],{"class":1606},[1585,3306,1669],{"class":1599},[1585,3308,1911],{"class":1754},[1585,3310,1774],{"class":1606},[1585,3312,2086],{"class":1595},[1585,3314,1669],{"class":1599},[1585,3316,2032],{"class":1754},[1585,3318,1774],{"class":1606},[1585,3320,3321],{"class":1595},"yScale",[1585,3323,3278],{"class":1606},[1585,3325,1849],{"class":1599},[1585,3327,3329,3331,3333],{"class":1587,"line":3328},59,[1585,3330,1824],{"class":1599},[1585,3332,1841],{"class":1595},[1585,3334,1849],{"class":1599},[1585,3336,3338,3340,3342],{"class":1587,"line":3337},60,[1585,3339,2242],{"class":1599},[1585,3341,2257],{"class":1606},[1585,3343,2198],{"class":1599},[1585,3345,3347],{"class":1587,"line":3346},61,[1585,3348,1732],{"emptyLinePlaceholder":1731},[1585,3350,3352,3354,3357,3360],{"class":1587,"line":3351},62,[1585,3353,2192],{"class":1599},[1585,3355,3356],{"class":1606},"style",[1585,3358,3359],{"class":1591}," scoped",[1585,3361,2198],{"class":1599},[1585,3363,3365,3367,3370],{"class":1587,"line":3364},63,[1585,3366,1669],{"class":1599},[1585,3368,2228],{"class":3369},"sYGMc",[1585,3371,2527],{"class":1599},[1585,3373,3375,3379,3381,3384],{"class":1587,"line":3374},64,[1585,3376,3378],{"class":3377},"sug0G","    width",[1585,3380,1610],{"class":1599},[1585,3382,3383],{"class":1613}," 480px",[1585,3385,1849],{"class":1599},[1585,3387,3389,3392,3394,3397],{"class":1587,"line":3388},65,[1585,3390,3391],{"class":3377},"    height",[1585,3393,1610],{"class":1599},[1585,3395,3396],{"class":1613}," 280px",[1585,3398,1849],{"class":1599},[1585,3400,3402],{"class":1587,"line":3401},66,[1585,3403,3404],{"class":1599},"}\n",[1585,3406,3408,3410,3412],{"class":1587,"line":3407},67,[1585,3409,2242],{"class":1599},[1585,3411,3356],{"class":1606},[1585,3413,2198],{"class":1599},[1531,3415,3416,3417,3419,3420,3423,3424,3427,3428,3419,3430,3433],{},"注意柱子的两个属性：",[1564,3418,3071],{}," 用 ",[1564,3421,3422],{},"yScale(d.value)"," 算出柱子",[1545,3425,3426],{},"顶部","的位置，",[1564,3429,1859],{},[1564,3431,3432],{},"height - yScale(d.value)","——内容区总高减去顶部位置，才是柱子本身的高度。",[1531,3435,3436],{},"现在每个图形属性都来自比例尺换算，数据换成什么都能正确显示，这就是“完整图表”和“玩具示例”的区别。",[1531,3438,3439],{},"这段代码的真实渲染效果如下：",[3441,3442],"d3-axis-chart",{},[1535,3444],{},[1526,3446,3448],{"id":3447},"小节总结","🧾 小节总结",[1885,3450,3451,3457,3472,3475,3483],{},[1888,3452,3453,3454,3456],{},"margin 约定：SVG 四周留边距放坐标轴，内容画在平移过的 ",[1564,3455,1572],{}," 里，range 基于内容区宽高。",[1888,3458,3459,3461,3462,3464,3465,3468,3469,3471],{},[1564,3460,1989],{}," 画 x 轴、",[1564,3463,2032],{}," 画 y 轴，固定套路：",[1564,3466,3467],{},"append('g')"," + 平移 + ",[1564,3470,1911],{},"。",[1888,3473,3474],{},"坐标轴函数会根据比例尺自动生成轴线和所有刻度。",[1888,3476,3477,3479,3480,3482],{},[1564,3478,2100],{}," 控制刻度数量，",[1564,3481,2118],{}," 自定义刻度文字。",[1888,3484,3485,3486,3489,3490,3471],{},"柱子 ",[1564,3487,3488],{},"y = yScale(d.value)","，",[1564,3491,3492],{},"height = height - yScale(d.value)",[1535,3494],{},[1526,3496,3498],{"id":3497},"知识问答","❓ 知识问答",[1531,3500,3501],{},[1545,3502,3503],{},"Q1：刻度文字重叠了怎么办？",[1531,3505,3506,3507,3509,3510,3512,3513,3516,3517,3520],{},"常用三种办法：减少 ",[1564,3508,2100],{}," 数量、用 ",[1564,3511,2118],{}," 缩短文字（如 ",[1564,3514,3515],{},"1000"," 显示成 ",[1564,3518,3519],{},"1k","）、旋转刻度文字角度。",[1531,3522,3523],{},[1545,3524,3525],{},"Q2：横向柱状图怎么画？",[1531,3527,3528,3529,3531,3532,3534,3535,3537],{},"对调两个轴即可：x 轴用 ",[1564,3530,2878],{},"（数值）、y 轴用 ",[1564,3533,2767],{},"（分类），柱子用 ",[1564,3536,1855],{}," 表示数值大小。",[1531,3539,3540],{},[1545,3541,3542],{},"Q3：为什么坐标轴要用 call，直接写不行吗？",[1531,3544,3545,3546,3548],{},"画一个坐标轴要创建轴线、刻度线、文字等一堆元素，",[1564,3547,1911],{}," 能把“把这一串操作交给坐标轴函数完成”的动作接在链式调用里，代码更整洁。它是 D3 的惯用写法，照用即可。",[1531,3550,3551],{},[1545,3552,3553],{},"Q4：margin 的值怎么定？",[1531,3555,3556,3557,3559,3560,3562],{},"看刻度文字的长度。数字大（如 1000000）就把 ",[1564,3558,1821],{}," 加大，x 轴标签要旋转就把 ",[1564,3561,1720],{}," 加大，没有固定标准，边画边调。",[1535,3564],{},[1526,3566,3568],{"id":3567},"小练习","🧪 小练习",[1531,3570,3571],{},"把本课的完整柱状图改造成“三门课程的成绩图”：",[3573,3574,3575,3578,3587],"ol",{},[1888,3576,3577],{},"数据改为语文 80、数学 95、英语 88。",[1888,3579,3580,3581,3583,3584,3586],{},"y 轴刻度用 ",[1564,3582,2157],{},"，并通过 ",[1564,3585,2118],{}," 给数字加上“分”字后缀。",[1888,3588,3589,3590,3471],{},"把柱子颜色改成 ",[1564,3591,3592],{},"#ee6666",[1557,3594,3596],{"className":1579,"code":3595,"language":1581,"meta":1566,"style":1566},"const data = [\n    { subject: '语文', score: 80 },\n    { subject: '数学', score: 95 },\n    { subject: '英语', score: 88 },\n];\n\nonMounted(() => {\n    // 请在这里编写代码\n});\n",[1564,3597,3598,3608,3635,3661,3687,3693,3697,3709,3714],{"__ignoreMap":1566},[1585,3599,3600,3602,3604,3606],{"class":1587,"line":1588},[1585,3601,1592],{"class":1591},[1585,3603,2354],{"class":1595},[1585,3605,1600],{"class":1599},[1585,3607,2359],{"class":1595},[1585,3609,3610,3612,3615,3617,3619,3622,3624,3626,3629,3631,3633],{"class":1587,"line":1650},[1585,3611,2365],{"class":1599},[1585,3613,3614],{"class":1606}," subject",[1585,3616,1610],{"class":1599},[1585,3618,2286],{"class":1599},[1585,3620,3621],{"class":1780},"语文",[1585,3623,1777],{"class":1599},[1585,3625,1617],{"class":1599},[1585,3627,3628],{"class":1606}," score",[1585,3630,1610],{"class":1599},[1585,3632,2469],{"class":1613},[1585,3634,2390],{"class":1599},[1585,3636,3637,3639,3641,3643,3645,3648,3650,3652,3654,3656,3659],{"class":1587,"line":1692},[1585,3638,2365],{"class":1599},[1585,3640,3614],{"class":1606},[1585,3642,1610],{"class":1599},[1585,3644,2286],{"class":1599},[1585,3646,3647],{"class":1780},"数学",[1585,3649,1777],{"class":1599},[1585,3651,1617],{"class":1599},[1585,3653,3628],{"class":1606},[1585,3655,1610],{"class":1599},[1585,3657,3658],{"class":1613}," 95",[1585,3660,2390],{"class":1599},[1585,3662,3663,3665,3667,3669,3671,3674,3676,3678,3680,3682,3685],{"class":1587,"line":1728},[1585,3664,2365],{"class":1599},[1585,3666,3614],{"class":1606},[1585,3668,1610],{"class":1599},[1585,3670,2286],{"class":1599},[1585,3672,3673],{"class":1780},"英语",[1585,3675,1777],{"class":1599},[1585,3677,1617],{"class":1599},[1585,3679,3628],{"class":1606},[1585,3681,1610],{"class":1599},[1585,3683,3684],{"class":1613}," 88",[1585,3686,2390],{"class":1599},[1585,3688,3689,3691],{"class":1587,"line":1735},[1585,3690,2504],{"class":1595},[1585,3692,1849],{"class":1599},[1585,3694,3695],{"class":1587,"line":1748},[1585,3696,1732],{"emptyLinePlaceholder":1731},[1585,3698,3699,3701,3703,3705,3707],{"class":1587,"line":1766},[1585,3700,2517],{"class":1754},[1585,3702,1774],{"class":1595},[1585,3704,2522],{"class":1599},[1585,3706,2131],{"class":1591},[1585,3708,2527],{"class":1599},[1585,3710,3711],{"class":1587,"line":1788},[1585,3712,3713],{"class":1688},"    // 请在这里编写代码\n",[1585,3715,3716,3718,3720],{"class":1587,"line":2323},[1585,3717,1824],{"class":1599},[1585,3719,1841],{"class":1595},[1585,3721,1849],{"class":1599},[1535,3723],{},[1531,3725,3726],{},"🎉 恭喜你已经能画出带坐标轴的正规图表了！下一篇我们学习图形生成器，向折线图和饼图进军。",[3356,3728,3729],{},"html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sndM8, html code.shiki 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