我怎么能算出这个数组对象中有多少个对象？在子对象中还有带对象的数组。不是很容易理解...你好看了stackoverflow但没有找到一个有用的答案。我在这个问题上找了一个例子：Link。也许我可以递归。有人有想法吗？还可以有100个物体阵列。
这只是一个例子：
let DATA = {
"name": "flare",
"children": [{
"name": "analytics",
"children": [{
"name": "cluster",
"children": [{
"name": "AgglomerativeCluster",
"size": 3938
}, {
"name": "CommunityStructure",
"size": 3812
}, {
"name": "HierarchicalCluster",
"size": 6714
}, {
"name": "MergeEdge",
"size": 743
}]
}, {
"name": "graph",
"children": [{
"name": "BetweennessCentrality",
"size": 3534
}, {
"name": "LinkDistance",
"size": 5731
}, {
"name": "MaxFlowMinCut",
"size": 7840
}, {
"name": "ShortestPaths",
"size": 5914
}, {
"name": "SpanningTree",
"size": 3416
}]
}, {
"name": "optimization",
"children": [{
"name": "AspectRatioBanker",
"size": 7074
}]
}]
}, {
"name": "animate",
"children": [{
"name": "Easing",
"size": 17010
}, {
"name": "FunctionSequence",
"size": 5842
}, {
"name": "interpolate",
"children": [{
"name": "ArrayInterpolator",
"size": 1983
}, {
"name": "ColorInterpolator",
"size": 2047
}, {
"name": "DateInterpolator",
"size": 1375
}, {
"name": "Interpolator",
"size": 8746
}, {
"name": "MatrixInterpolator",
"size": 2202
}, {
"name": "NumberInterpolator",
"size": 1382
}, {
"name": "ObjectInterpolator",
"size": 1629
}, {
"name": "PointInterpolator",
"size": 1675
}, {
"name": "RectangleInterpolator",
"size": 2042
}]
}, {
"name": "ISchedulable",
"size": 1041
}, {
"name": "Parallel",
"size": 5176
}, {
"name": "Pause",
"size": 449
}, {
"name": "Scheduler",
"size": 5593
}, {
"name": "Sequence",
"size": 5534
}, {
"name": "Transition",
"size": 9201
}, {
"name": "Transitioner",
"size": 19975
}, {
"name": "TransitionEvent",
"size": 1116
}, {
"name": "Tween",
"size": 6006
}]
}, {
"name": "data",
"children": [{
"name": "converters",
"children": [{
"name": "Converters",
"size": 721
}, {
"name": "DelimitedTextConverter",
"size": 4294
}, {
"name": "GraphMLConverter",
"size": 9800
}, {
"name": "IDataConverter",
"size": 1314
}, {
"name": "JSONConverter",
"size": 2220
}]
}, {
"name": "DataField",
"size": 1759
}, {
"name": "DataSchema",
"size": 2165
}, {
"name": "DataSet",
"size": 586
}, {
"name": "DataSource",
"size": 3331
}, {
"name": "DataTable",
"size": 772
}, {
"name": "DataUtil",
"size": 3322
}]
}, {
"name": "display",
"children": [{
"name": "DirtySprite",
"size": 8833
}, {
"name": "LineSprite",
"size": 1732
}, {
"name": "RectSprite",
"size": 3623
}, {
"name": "TextSprite",
"size": 10066
}]
}, {
"name": "flex",
"children": [{
"name": "FlareVis",
"size": 4116
}]
}, {
"name": "physics",
"children": [{
"name": "DragForce",
"size": 1082
}, {
"name": "GravityForce",
"size": 1336
}, {
"name": "IForce",
"size": 319
}, {
"name": "NBodyForce",
"size": 10498
}, {
"name": "Particle",
"size": 2822
}, {
"name": "Simulation",
"size": 9983
}, {
"name": "Spring",
"size": 2213
}, {
"name": "SpringForce",
"size": 1681
}]
}, {
"name": "query",
"children": [{
"name": "AggregateExpression",
"size": 1616
}, {
"name": "And",
"size": 1027
}, {
"name": "Arithmetic",
"size": 3891
}, {
"name": "Average",
"size": 891
}, {
"name": "BinaryExpression",
"size": 2893
}, {
"name": "Comparison",
"size": 5103
}, {
"name": "CompositeExpression",
"size": 3677
}, {
"name": "Count",
"size": 781
}, {
"name": "DateUtil",
"size": 4141
}, {
"name": "Distinct",
"size": 933
}, {
"name": "Expression",
"size": 5130
}, {
"name": "ExpressionIterator",
"size": 3617
}, {
"name": "Fn",
"size": 3240
}, {
"name": "If",
"size": 2732
}, {
"name": "IsA",
"size": 2039
}, {
"name": "Literal",
"size": 1214
}, {
"name": "Match",
"size": 3748
}, {
"name": "Maximum",
"size": 843
}, {
"name": "methods",
"children": [{
"name": "add",
"size": 593
}, {
"name": "and",
"size": 330
}, {
"name": "average",
"size": 287
}, {
"name": "count",
"size": 277
}, {
"name": "distinct",
"size": 292
}, {
"name": "div",
"size": 595
}, {
"name": "eq",
"size": 594
}, {
"name": "fn",
"size": 460
}, {
"name": "gt",
"size": 603
}, {
"name": "gte",
"size": 625
}, {
"name": "iff",
"size": 748
}, {
"name": "isa",
"size": 461
}, {
"name": "lt",
"size": 597
}, {
"name": "lte",
"size": 619
}, {
"name": "max",
"size": 283
}, {
"name": "min",
"size": 283
}, {
"name": "mod",
"size": 591
}, {
"name": "mul",
"size": 603
}, {
"name": "neq",
"size": 599
}, {
"name": "not",
"size": 386
}, {
"name": "or",
"size": 323
}, {
"name": "orderby",
"size": 307
}, {
"name": "range",
"size": 772
}, {
"name": "select",
"size": 296
}, {
"name": "stddev",
"size": 363
}, {
"name": "sub",
"size": 600
}, {
"name": "sum",
"size": 280
}, {
"name": "update",
"size": 307
}, {
"name": "variance",
"size": 335
}, {
"name": "where",
"size": 299
}, {
"name": "xor",
"size": 354
}, {
"name": "_",
"size": 264
}]
}, {
"name": "Minimum",
"size": 843
}, {
"name": "Not",
"size": 1554
}, {
"name": "Or",
"size": 970
}, {
"name": "Query",
"size": 13896
}, {
"name": "Range",
"size": 1594
}, {
"name": "StringUtil",
"size": 4130
}, {
"name": "Sum",
"size": 791
}, {
"name": "Variable",
"size": 1124
}, {
"name": "Variance",
"size": 1876
}, {
"name": "Xor",
"size": 1101
}]
}, {
"name": "scale",
"children": [{
"name": "IScaleMap",
"size": 2105
}, {
"name": "LinearScale",
"size": 1316
}, {
"name": "LogScale",
"size": 3151
}, {
"name": "OrdinalScale",
"size": 3770
}, {
"name": "QuantileScale",
"size": 2435
}, {
"name": "QuantitativeScale",
"size": 4839
}, {
"name": "dataScale",
"size": 1756
}, {
"name": "Scale",
"size": 4268
}, {
"name": "ScaleType",
"size": 1821
}, {
"name": "TimeScale",
"size": 5833
}]
}, {
"name": "util",
"children": [{
"name": "Arrays",
"size": 8258
}, {
"name": "Colors",
"size": 10001
}, {
"name": "Dates",
"size": 8217
}, {
"name": "Displays",
"size": 12555
}, {
"name": "Filter",
"size": 2324
}, {
"name": "Geometry",
"size": 10993
}, {
"name": "heap",
"children": [{
"name": "FibonacciHeap",
"size": 9354
}, {
"name": "HeapNode",
"size": 1233
}]
}, {
"name": "IEvaluable",
"size": 335
}, {
"name": "IPredicate",
"size": 383
}, {
"name": "IValueProxy",
"size": 874
}, {
"name": "math",
"children": [{
"name": "DenseMatrix",
"size": 3165
}, {
"name": "IMatrix",
"size": 2815
}, {
"name": "SparseMatrix",
"size": 3366
}]
}, {
"name": "Maths",
"size": 17705
}, {
"name": "Orientation",
"size": 1486
}, {
"name": "palette",
"children": [{
"name": "ColorPalette",
"size": 6367
}, {
"name": "Palette",
"size": 1229
}, {
"name": "ShapePalette",
"size": 2059
}, {
"name": "SizePalette",
"size": 2291
}]
}, {
"name": "Property",
"size": 5559
}, {
"name": "Shapes",
"size": 19118
}, {
"name": "Sort",
"size": 6887
}, {
"name": "Stats",
"size": 6557
}, {
"name": "Strings",
"size": 22026
}]
}, {
"name": "vis",
"children": [{
"name": "axis",
"children": [{
"name": "Axes",
"size": 1302
}, {
"name": "Axis",
"size": 24593
}, {
"name": "AxisGridLine",
"size": 652
}, {
"name": "AxisLabel",
"size": 636
}, {
"name": "CartesianAxes",
"size": 6703
}]
}, {
"name": "controls",
"children": [{
"name": "AnchorControl",
"size": 2138
}, {
"name": "ClickControl",
"size": 3824
}, {
"name": "Control",
"size": 1353
}, {
"name": "ControlList",
"size": 4665
}, {
"name": "DragControl",
"size": 2649
}, {
"name": "ExpandControl",
"size": 2832
}, {
"name": "HoverControl",
"size": 4896
}, {
"name": "IControl",
"size": 763
}, {
"name": "PanZoomControl",
"size": 5222
}, {
"name": "SelectionControl",
"size": 7862
}, {
"name": "TooltipControl",
"size": 8435
}]
}, {
"name": "data",
"children": [{
"name": "Data",
"size": 20544
}, {
"name": "DataList",
"size": 19788
}, {
"name": "DataSprite",
"size": 10349
}, {
"name": "EdgeSprite",
"size": 3301
}, {
"name": "NodeSprite",
"size": 19382
}, {
"name": "render",
"children": [{
"name": "ArrowType",
"size": 698
}, {
"name": "EdgeRenderer",
"size": 5569
}, {
"name": "IRenderer",
"size": 353
}, {
"name": "ShapeRenderer",
"size": 2247
}]
}, {
"name": "ScaleBinding",
"size": 11275
}, {
"name": "Tree",
"size": 7147
}, {
"name": "TreeBuilder",
"size": 9930
}]
}, {
"name": "events",
"children": [{
"name": "DataEvent",
"size": 2313
}, {
"name": "SelectionEvent",
"size": 1880
}, {
"name": "TooltipEvent",
"size": 1701
}, {
"name": "VisualizationEvent",
"size": 1117
}]
}, {
"name": "legend",
"children": [{
"name": "Legend",
"size": 20859
}, {
"name": "LegendItem",
"size": 4614
}, {
"name": "LegendRange",
"size": 10530
}]
}, {
"name": "operator",
"children": [{
"name": "distortion",
"children": [{
"name": "BifocalDistortion",
"size": 4461
}, {
"name": "Distortion",
"size": 6314
}, {
"name": "FisheyeDistortion",
"size": 3444
}]
}, {
"name": "encoder",
"children": [{
"name": "ColorEncoder",
"size": 3179
}, {
"name": "Encoder",
"size": 4060
}, {
"name": "PropertyEncoder",
"size": 4138
}, {
"name": "ShapeEncoder",
"size": 1690
}, {
"name": "SizeEncoder",
"size": 1830
}]
}, {
"name": "filter",
"children": [{
"name": "FisheyeTreeFilter",
"size": 5219
}, {
"name": "GraphDistanceFilter",
"size": 3165
}, {
"name": "VisibilityFilter",
"size": 3509
}]
}, {
"name": "IOperator",
"size": 1286
}, {
"name": "label",
"children": [{
"name": "Labeler",
"size": 9956
}, {
"name": "RadialLabeler",
"size": 3899
}, {
"name": "StackedAreaLabeler",
"size": 3202
}]
}, {
"name": "layout",
"children": [{
"name": "AxisLayout",
"size": 6725
}, {
"name": "BundledEdgeRouter",
"size": 3727
}, {
"name": "CircleLayout",
"size": 9317
}, {
"name": "CirclePackingLayout",
"size": 12003
}, {
"name": "DendrogramLayout",
"size": 4853
}, {
"name": "ForceDirectedLayout",
"size": 8411
}, {
"name": "IcicleTreeLayout",
"size": 4864
}, {
"name": "IndentedTreeLayout",
"size": 3174
}, {
"name": "Layout",
"size": 7881
}, {
"name": "NodeLinkTreeLayout",
"size": 12870
}, {
"name": "PieLayout",
"size": 2728
}, {
"name": "RadialTreeLayout",
"size": 12348
}, {
"name": "RandomLayout",
"size": 870
}, {
"name": "StackedAreaLayout",
"size": 9121
}, {
"name": "TreeMapLayout",
"size": 9191
}]
}, {
"name": "Operator",
"size": 2490
}, {
"name": "OperatorList",
"size": 5248
}, {
"name": "OperatorSequence",
"size": 4190
}, {
"name": "OperatorSwitch",
"size": 2581
}, {
"name": "SortOperator",
"size": 2023
}]
}, {
"name": "Visualization",
"size": 16540
}]
}]
}
使用ES2015：
const count = (item) => 1 + (item.children || []).map(count).reduce((a, b) => a + b, 0)
count(DATA) //=> 252
使用递归。
function countObjects(obj) {
// the current element is an object +1
count = 1;
// check if object has children
if (Array.isArray(obj.children)) {
// loop through children
obj.children.forEach(child => {
// count # of objects within each child and tally
count += countObjects(child)
});
}
return count;
}
console.log(countObjects(DATA));
（我最终得到252，这是{的数量）