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里，这时容器才真实存在。",[1535,1814],{},[1526,1816,1818],{"id":1817},"封装-barchart-组件","🛠 封装 BarChart 组件",[1531,1820,1821,1822,1825],{},"按这个原则，把比例尺、坐标轴、数据绑定全部收进组件，对外只暴露一个 ",[1557,1823,1824],{},"data"," 属性：",[1550,1827,1830],{"className":1552,"code":1828,"filename":1829,"language":1554,"meta":1555,"style":1555},"\u003Ctemplate>\n    \u003Csvg ref=\"svgRef\" class=\"chart\">\u003C/svg>\n\u003C/template>\n\n\u003Cscript setup>\nimport { onMounted, ref, watch } from 'vue';\nimport * as d3 from 'd3';\n\nconst props = defineProps({\n    data: {\n        type: Array,\n        required: true,\n    },\n});\n\nconst svgRef = ref(null);\n\nconst render = () => {\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    // 先清空再重画，保证不会重复叠加\n    const root = d3.select(svgRef.value);\n    root.selectAll('*').remove();\n\n    const svg = root\n        .append('g')\n        .attr('transform', 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svg",[1560,2605,1700],{"class":1566},[1560,2607,1704],{"class":1703},[1560,2609,1707],{"class":1570},[1560,2611,1710],{"class":1566},[1560,2613,1601],{"class":1614},[1560,2615,1710],{"class":1566},[1560,2617,2316],{"class":1570},[1560,2619,2621,2623,2625,2627,2629,2631,2633],{"class":1562,"line":2620},44,[1560,2622,2301],{"class":1566},[1560,2624,1824],{"class":1703},[1560,2626,1707],{"class":1570},[1560,2628,2416],{"class":1696},[1560,2630,1700],{"class":1566},[1560,2632,1824],{"class":1696},[1560,2634,2316],{"class":1570},[1560,2636,2638,2640,2643,2645,2647,2649,2651],{"class":1562,"line":2637},45,[1560,2639,2301],{"class":1566},[1560,2641,2642],{"class":1703},"join",[1560,2644,1707],{"class":1570},[1560,2646,1710],{"class":1566},[1560,2648,1601],{"class":1614},[1560,2650,1710],{"class":1566},[1560,2652,2316],{"class":1570},[1560,2654,2656,2658,2660,2662,2664,2667,2669,2671,2673,2675,2677,2679,2681,2683,2685,2687,2689],{"class":1562,"line":2655},46,[1560,2657,2301],{"class":1566},[1560,2659,1722],{"class":1703},[1560,2661,1707],{"class":1570},[1560,2663,1710],{"class":1566},[1560,2665,2666],{"class":1614},"x",[1560,2668,1710],{"class":1566},[1560,2670,1734],{"class":1566},[1560,2672,2546],{"class":1566},[1560,2674,2433],{"class":2432},[1560,2676,1717],{"class":1566},[1560,2678,2080],{"class":1604},[1560,2680,2387],{"class":1703},[1560,2682,1707],{"class":1570},[1560,2684,2433],{"class":1696},[1560,2686,1700],{"class":1566},[1560,2688,2445],{"class":1696},[1560,2690,2448],{"class":1570},[1560,2692,2694,2696,2698,2700,2702,2705,2707,2709,2711,2713,2715,2717,2719,2721,2723,2725,2727],{"class":1562,"line":2693},47,[1560,2695,2301],{"class":1566},[1560,2697,1722],{"class":1703},[1560,2699,1707],{"class":1570},[1560,2701,1710],{"class":1566},[1560,2703,2704],{"class":1614},"y",[1560,2706,1710],{"class":1566},[1560,2708,1734],{"class":1566},[1560,2710,2546],{"class":1566},[1560,2712,2433],{"class":2432},[1560,2714,1717],{"class":1566},[1560,2716,2080],{"class":1604},[1560,2718,2499],{"class":1703},[1560,2720,1707],{"class":1570},[1560,2722,2433],{"class":1696},[1560,2724,1700],{"class":1566},[1560,2726,2242],{"class":1696},[1560,2728,2448],{"class":1570},[1560,2730,2732,2734,2736,2738,2740,2743,2745,2747,2749,2751,2754],{"class":1562,"line":2731},48,[1560,2733,2301],{"class":1566},[1560,2735,1722],{"class":1703},[1560,2737,1707],{"class":1570},[1560,2739,1710],{"class":1566},[1560,2741,2742],{"class":1614},"width",[1560,2744,1710],{"class":1566},[1560,2746,1734],{"class":1566},[1560,2748,2387],{"class":1696},[1560,2750,1700],{"class":1566},[1560,2752,2753],{"class":1703},"bandwidth",[1560,2755,2756],{"class":1570},"())\n",[1560,2758,2760,2762,2764,2766,2768,2770,2772,2774,2776,2778,2780,2782,2784,2786,2788,2790,2792,2794,2796],{"class":1562,"line":2759},49,[1560,2761,2301],{"class":1566},[1560,2763,1722],{"class":1703},[1560,2765,1707],{"class":1570},[1560,2767,1710],{"class":1566},[1560,2769,2573],{"class":1614},[1560,2771,1710],{"class":1566},[1560,2773,1734],{"class":1566},[1560,2775,2546],{"class":1566},[1560,2777,2433],{"class":2432},[1560,2779,1717],{"class":1566},[1560,2781,2080],{"class":1604},[1560,2783,2179],{"class":1696},[1560,2785,2153],{"class":1566},[1560,2787,2499],{"class":1703},[1560,2789,1707],{"class":1570},[1560,2791,2433],{"class":1696},[1560,2793,1700],{"class":1566},[1560,2795,2242],{"class":1696},[1560,2797,2448],{"class":1570},[1560,2799,2801,2803,2805,2807,2809,2811,2813,2815,2817,2820,2822,2824],{"class":1562,"line":2800},50,[1560,2802,2301],{"class":1566},[1560,2804,1722],{"class":1703},[1560,2806,1707],{"class":1570},[1560,2808,1710],{"class":1566},[1560,2810,1729],{"class":1614},[1560,2812,1710],{"class":1566},[1560,2814,1734],{"class":1566},[1560,2816,1737],{"class":1566},[1560,2818,2819],{"class":1614},"#5470c6",[1560,2821,1710],{"class":1566},[1560,2823,1717],{"class":1570},[1560,2825,1747],{"class":1566},[1560,2827,2829],{"class":1562,"line":2828},51,[1560,2830,1671],{"emptyLinePlaceholder":1670},[1560,2832,2834,2836,2838,2840,2842,2844,2846,2848],{"class":1562,"line":2833},52,[1560,2835,2603],{"class":1696},[1560,2837,1700],{"class":1566},[1560,2839,2304],{"class":1703},[1560,2841,1707],{"class":1570},[1560,2843,1710],{"class":1566},[1560,2845,2311],{"class":1614},[1560,2847,1710],{"class":1566},[1560,2849,2316],{"class":1570},[1560,2851,2853,2855,2857,2859,2861,2863,2865,2867,2869,2872,2874,2876,2878,2880,2882],{"class":1562,"line":2852},53,[1560,2854,2301],{"class":1566},[1560,2856,1722],{"class":1703},[1560,2858,1707],{"class":1570},[1560,2860,1710],{"class":1566},[1560,2862,2330],{"class":1614},[1560,2864,1710],{"class":1566},[1560,2866,1734],{"class":1566},[1560,2868,2337],{"class":1566},[1560,2870,2871],{"class":1614},"translate(0, 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// 挂载后画第一次\n",[1560,2983,2985],{"class":1562,"line":2984},60,[1560,2986,1671],{"emptyLinePlaceholder":1670},[1560,2988,2990],{"class":1562,"line":2989},61,[1560,2991,2992],{"class":1580},"// 数据变化时自动重画\n",[1560,2994,2996,2999,3001,3003,3005,3008,3010,3012,3014,3017,3019,3021,3024,3026,3028,3030,3032],{"class":1562,"line":2995},62,[1560,2997,2998],{"class":1703},"watch",[1560,3000,1707],{"class":1696},[1560,3002,2275],{"class":1566},[1560,3004,2080],{"class":1604},[1560,3006,3007],{"class":1696}," props",[1560,3009,1700],{"class":1566},[1560,3011,1824],{"class":1696},[1560,3013,1734],{"class":1566},[1560,3015,3016],{"class":1696}," render",[1560,3018,1734],{"class":1566},[1560,3020,1907],{"class":1566},[1560,3022,3023],{"class":1570}," deep",[1560,3025,1987],{"class":1566},[1560,3027,2015],{"class":2014},[1560,3029,1922],{"class":1566},[1560,3031,1717],{"class":1696},[1560,3033,1747],{"class":1566},[1560,3035,3037,3039,3041],{"class":1562,"line":3036},63,[1560,3038,1660],{"class":1566},[1560,3040,1679],{"class":1570},[1560,3042,1574],{"class":1566},[1560,3044,3046],{"class":1562,"line":3045},64,[1560,3047,1671],{"emptyLinePlaceholder":1670},[1560,3049,3051,3053,3056,3059],{"class":1562,"line":3050},65,[1560,3052,1567],{"class":1566},[1560,3054,3055],{"class":1570},"style",[1560,3057,3058],{"class":1604}," scoped",[1560,3060,1574],{"class":1566},[1560,3062,3064,3066,3069],{"class":1562,"line":3063},66,[1560,3065,1700],{"class":1566},[1560,3067,1867],{"class":3068},"sYGMc",[1560,3070,1990],{"class":1566},[1560,3072,3074,3078,3080,3083],{"class":1562,"line":3073},67,[1560,3075,3077],{"class":3076},"sug0G","    width",[1560,3079,1987],{"class":1566},[1560,3081,3082],{"class":2104}," 480px",[1560,3084,1747],{"class":1566},[1560,3086,3088,3091,3093,3096],{"class":1562,"line":3087},68,[1560,3089,3090],{"class":3076},"    height",[1560,3092,1987],{"class":1566},[1560,3094,3095],{"class":2104}," 280px",[1560,3097,1747],{"class":1566},[1560,3099,3101],{"class":1562,"line":3100},69,[1560,3102,3103],{"class":1566},"}\n",[1560,3105,3107,3109,3111],{"class":1562,"line":3106},70,[1560,3108,1660],{"class":1566},[1560,3110,3055],{"class":1570},[1560,3112,1574],{"class":1566},[1531,3114,3115],{},"整个组件就四个部分，对照着看就清楚了：",[1775,3117,3118,3126,3132,3138],{},[1778,3119,3120,3123,3124,1795],{},[1557,3121,3122],{},"defineProps","：声明接收的 ",[1557,3125,1824],{},[1778,3127,3128,3131],{},[1557,3129,3130],{},"render","：完整的画图逻辑（前几篇学过的内容原样搬进来）。",[1778,3133,3134,3137],{},[1557,3135,3136],{},"onMounted(render)","：挂载后画第一次。",[1778,3139,3140,3142,3143,3146],{},[1557,3141,2998],{},"：数据变了自动重画，",[1557,3144,3145],{},"deep: true"," 保证数组内部修改也能监听到。",[1531,3148,3149],{},"使用时一行搞定：",[1550,3151,3154],{"className":1552,"code":3152,"filename":3153,"language":1554,"meta":1555,"style":1555},"\u003Ctemplate>\n    \u003CBarChart :data=\"list\" />\n\u003C/template>\n\n\u003Cscript setup>\nimport { ref } from 'vue';\nimport BarChart from '@/components/BarChart.vue';\n\nconst list = ref([\n    { day: '周一', value: 120 },\n    { day: '周二', value: 200 },\n    { day: '周三', value: 150 },\n]);\n\u003C/script>\n","views/Sales.vue",[1557,3155,3156,3164,3185,3193,3197,3207,3227,3245,3249,3263,3293,3319,3345,3352],{"__ignoreMap":1555},[1560,3157,3158,3160,3162],{"class":1562,"line":1563},[1560,3159,1567],{"class":1566},[1560,3161,1571],{"class":1570},[1560,3163,1574],{"class":1566},[1560,3165,3166,3168,3171,3174,3176,3178,3181,3183],{"class":1562,"line":1577},[1560,3167,1587],{"class":1566},[1560,3169,3170],{"class":1570},"BarChart",[1560,3172,3173],{"class":1604}," :data",[1560,3175,1608],{"class":1566},[1560,3177,1611],{"class":1566},[1560,3179,3180],{"class":1614},"list",[1560,3182,1611],{"class":1566},[1560,3184,1644],{"class":1566},[1560,3186,3187,3189,3191],{"class":1562,"line":1584},[1560,3188,1660],{"class":1566},[1560,3190,1571],{"class":1570},[1560,3192,1574],{"class":1566},[1560,3194,3195],{"class":1562,"line":1595},[1560,3196,1671],{"emptyLinePlaceholder":1670},[1560,3198,3199,3201,3203,3205],{"class":1562,"line":1647},[1560,3200,1567],{"class":1566},[1560,3202,1679],{"class":1570},[1560,3204,1682],{"class":1604},[1560,3206,1574],{"class":1566},[1560,3208,3209,3211,3213,3215,3217,3219,3221,3223,3225],{"class":1562,"line":1657},[1560,3210,1904],{"class":1903},[1560,3212,1907],{"class":1566},[1560,3214,1848],{"class":1696},[1560,3216,1922],{"class":1566},[1560,3218,1925],{"class":1903},[1560,3220,1737],{"class":1566},[1560,3222,1554],{"class":1614},[1560,3224,1710],{"class":1566},[1560,3226,1747],{"class":1566},[1560,3228,3229,3231,3234,3236,3238,3241,3243],{"class":1562,"line":1667},[1560,3230,1904],{"class":1903},[1560,3232,3233],{"class":1696}," BarChart ",[1560,3235,1949],{"class":1903},[1560,3237,1737],{"class":1566},[1560,3239,3240],{"class":1614},"@/components/BarChart.vue",[1560,3242,1710],{"class":1566},[1560,3244,1747],{"class":1566},[1560,3246,3247],{"class":1562,"line":1674},[1560,3248,1671],{"emptyLinePlaceholder":1670},[1560,3250,3251,3253,3256,3258,3260],{"class":1562,"line":1687},[1560,3252,1966],{"class":1604},[1560,3254,3255],{"class":1696}," list ",[1560,3257,1608],{"class":1566},[1560,3259,1848],{"class":1703},[1560,3261,3262],{"class":1696},"([\n",[1560,3264,3265,3268,3271,3273,3275,3278,3280,3282,3285,3287,3290],{"class":1562,"line":1693},[1560,3266,3267],{"class":1566},"    {",[1560,3269,3270],{"class":1570}," day",[1560,3272,1987],{"class":1566},[1560,3274,1737],{"class":1566},[1560,3276,3277],{"class":1614},"周一",[1560,3279,1710],{"class":1566},[1560,3281,1734],{"class":1566},[1560,3283,3284],{"class":1570}," value",[1560,3286,1987],{"class":1566},[1560,3288,3289],{"class":2104}," 120",[1560,3291,3292],{"class":1566}," },\n",[1560,3294,3295,3297,3299,3301,3303,3306,3308,3310,3312,3314,3317],{"class":1562,"line":1750},[1560,3296,3267],{"class":1566},[1560,3298,3270],{"class":1570},[1560,3300,1987],{"class":1566},[1560,3302,1737],{"class":1566},[1560,3304,3305],{"class":1614},"周二",[1560,3307,1710],{"class":1566},[1560,3309,1734],{"class":1566},[1560,3311,3284],{"class":1570},[1560,3313,1987],{"class":1566},[1560,3315,3316],{"class":2104}," 200",[1560,3318,3292],{"class":1566},[1560,3320,3321,3323,3325,3327,3329,3332,3334,3336,3338,3340,3343],{"class":1562,"line":2006},[1560,3322,3267],{"class":1566},[1560,3324,3270],{"class":1570},[1560,3326,1987],{"class":1566},[1560,3328,1737],{"class":1566},[1560,3330,3331],{"class":1614},"周三",[1560,3333,1710],{"class":1566},[1560,3335,1734],{"class":1566},[1560,3337,3284],{"class":1570},[1560,3339,1987],{"class":1566},[1560,3341,3342],{"class":2104}," 150",[1560,3344,3292],{"class":1566},[1560,3346,3347,3350],{"class":1562,"line":2020},[1560,3348,3349],{"class":1696},"])",[1560,3351,1747],{"class":1566},[1560,3353,3354,3356,3358],{"class":1562,"line":2026},[1560,3355,1660],{"class":1566},[1560,3357,1679],{"class":1570},[1560,3359,1574],{"class":1566},[3361,3362,3363],"tip",{},[1531,3364,3365,3367,3368,3371],{},[1557,3366,3130],{}," 里用了最朴素的“清空重画”策略：",[1557,3369,3370],{},"selectAll('*').remove()"," 删掉所有图形再重新渲染。简单可靠，绝大多数场景性能完全够用。追求丝滑动画时，可以换成动画篇学的“重新绑定数据 + transition”增量更新。",[1531,3373,3374],{},"下面就是这个封装思路的最终效果——入场生长动画、刷新数据的更新过渡、悬停提示框，全部具备：",[3376,3377],"d3-dashboard",{},[1535,3379],{},[1526,3381,3383],{"id":3382},"vue-中使用-d3-的常见坑","💡 Vue 中使用 D3 的常见坑",[3385,3386,3387,3403],"table",{},[3388,3389,3390],"thead",{},[3391,3392,3393,3397,3400],"tr",{},[3394,3395,3396],"th",{},"坑",[3394,3398,3399],{},"原因",[3394,3401,3402],{},"对策",[3404,3405,3406,3423,3437,3450,3461],"tbody",{},[3391,3407,3408,3412,3418],{},[3409,3410,3411],"td",{},"图形不显示",[3409,3413,3414,3415,3417],{},"在 ",[1557,3416,1811],{}," 前初始化，容器不存在",[3409,3419,3420,3421],{},"画图代码放进 ",[1557,3422,1811],{},[3391,3424,3425,3428,3431],{},[3409,3426,3427],{},"数据变了图没变",[3409,3429,3430],{},"没有监听 props 变化",[3409,3432,3433,3434,3436],{},"用 ",[1557,3435,2998],{}," 监听并在回调里重画",[3391,3438,3439,3442,3445],{},[3409,3440,3441],{},"图形越画越多、重叠",[3409,3443,3444],{},"重画前没清空旧图形",[3409,3446,3447,3448],{},"渲染前先 ",[1557,3449,3370],{},[3391,3451,3452,3455,3458],{},[3409,3453,3454],{},"画面错乱",[3409,3456,3457],{},"Vue 和 D3 同时操作同一批节点",[3409,3459,3460],{},"模板只留空容器，内部全交给 D3",[3391,3462,3463,3466,3469],{},[3409,3464,3465],{},"组件卸载后报错",[3409,3467,3468],{},"window 上的事件监听没移除",[3409,3470,3414,3471,3474],{},[1557,3472,3473],{},"onBeforeUnmount"," 里移除监听",[1531,3476,3477,3478,3481,3482,3485,3486,1801,3489,3491,3492,3494],{},"D3 不像 ECharts 有 ",[1557,3479,3480],{},"dispose"," 方法，组件卸载时 DOM 会被 Vue 一并移除，一般不需要额外清理。",[1545,3483,3484],{},"唯一要记住的是","：如果你在 ",[1557,3487,3488],{},"window",[1557,3490,7],{}," 上绑了监听（如 resize），必须在 ",[1557,3493,3473],{}," 里移除。",[1535,3496],{},[1526,3498,3500],{"id":3499},"小节总结","🧾 小节总结",[3502,3503,3504,3507,3510,3525,3528],"ul",{},[1778,3505,3506],{},"分工原则：Vue 渲染空容器，D3 管理容器内部的图形，互不越界。",[1778,3508,3509],{},"同一批节点只能由一方管理，混用必乱。",[1778,3511,3512,3513,3515,3516,3518,3519,3521,3522,3524],{},"封装四部曲：",[1557,3514,3122],{}," 接数据、",[1557,3517,3130],{}," 画图、",[1557,3520,1811],{}," 首绘、",[1557,3523,2998],{}," 重画。",[1778,3526,3527],{},"重画策略：简单场景“清空重画”，追求动画用“重新绑定 + transition”。",[1778,3529,3530],{},"D3 无需 dispose，但 window 上的事件监听要在卸载时手动移除。",[1535,3532],{},[1526,3534,3536],{"id":3535},"知识问答","❓ 知识问答",[1531,3538,3539],{},[1545,3540,3541],{},"Q1：父组件数据是异步获取的，初始是空数组怎么办？",[1531,3543,3414,3544,3546,3547,1795,3550,3552],{},[1557,3545,3130],{}," 开头加保护：",[1557,3548,3549],{},"if (!props.data.length) return;",[1557,3551,2998],{}," 会在数据到达后自动触发重画。",[1531,3554,3555],{},[1545,3556,3557],{},"Q2：一个页面放多个 BarChart 会互相影响吗？",[1531,3559,3560,3561,3563],{},"不会。每个组件实例有自己的 ",[1557,3562,1855],{},"，D3 的选择都基于这个容器，天然隔离。",[1531,3565,3566],{},[1545,3567,3568],{},"Q3：为什么不直接用 v-for 渲染柱子，非要 D3？",[1531,3570,3571],{},"简单静态图表确实可以。但 D3 的比例尺、坐标轴、动画、缩放是成套体系，v-for 只能解决“画出来”，解决不了“专业地画”。",[1531,3573,3574],{},[1545,3575,3576],{},"Q4：社区有现成的 D3 + Vue 封装库吗？",[1531,3578,3579],{},"有一些，但 D3 的魅力就在于完全自定义，实际项目大多按本课的方式自己封装。掌握原理后，看任何封装库都能一眼看穿。",[1535,3581],{},[1526,3583,3585],{"id":3584},"小练习","🧪 小练习",[1531,3587,3588,3589,3591],{},"基于本课的 ",[1557,3590,3170],{}," 组件完成一个“数据看板”：",[1775,3593,3594,3600,3606],{},[1778,3595,3596,3597,3599],{},"页面上放一个 ",[1557,3598,3170],{}," 和一个“刷新数据”按钮。",[1778,3601,3602,3603,3605],{},"点击按钮生成 5 条随机数据并赋值给 ",[1557,3604,3180],{},"，观察图表自动重画。",[1778,3607,3608],{},"进阶：把“清空重画”换成“重新绑定数据 + transition”，观察柱子平滑升降。",[1550,3610,3613],{"className":1552,"code":3611,"filename":3612,"language":1554,"meta":1555,"style":1555},"\u003Ctemplate>\n    \u003C!-- 请在这里编写代码 -->\n\u003C/template>\n\n\u003Cscript setup>\n// 请在这里编写代码\n\u003C/script>\n","views/Dashboard.vue",[1557,3614,3615,3623,3628,3636,3640,3650,3655],{"__ignoreMap":1555},[1560,3616,3617,3619,3621],{"class":1562,"line":1563},[1560,3618,1567],{"class":1566},[1560,3620,1571],{"class":1570},[1560,3622,1574],{"class":1566},[1560,3624,3625],{"class":1562,"line":1577},[1560,3626,3627],{"class":1580},"    \u003C!-- 请在这里编写代码 -->\n",[1560,3629,3630,3632,3634],{"class":1562,"line":1584},[1560,3631,1660],{"class":1566},[1560,3633,1571],{"class":1570},[1560,3635,1574],{"class":1566},[1560,3637,3638],{"class":1562,"line":1595},[1560,3639,1671],{"emptyLinePlaceholder":1670},[1560,3641,3642,3644,3646,3648],{"class":1562,"line":1647},[1560,3643,1567],{"class":1566},[1560,3645,1679],{"class":1570},[1560,3647,1682],{"class":1604},[1560,3649,1574],{"class":1566},[1560,3651,3652],{"class":1562,"line":1657},[1560,3653,3654],{"class":1580},"// 请在这里编写代码\n",[1560,3656,3657,3659,3661],{"class":1562,"line":1667},[1560,3658,1660],{"class":1566},[1560,3660,1679],{"class":1570},[1560,3662,1574],{"class":1566},[1535,3664],{},[1531,3666,3667],{},"🎉 恭喜你已经完整掌握 D3 的核心技能啦！从数据绑定到比例尺、坐标轴、图形生成器、动画交互，再到 Vue3 封装，你已经具备用 D3 实现定制化可视化的能力。D3 的世界很大，力导向图、地图、树图都在向你招手，快去探索吧！",[3055,3669,3670],{},"html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sd2Uz, html 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