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在 React 中试用 D3 的这个例子。我看到我们可以使用以下数据方案制作简单的可折叠树，

"name": "flare",
    "children": [{
        "name": "analytics",
        "children": [{
            "name": "cluster",
            "children": [{
                "name": "AgglomerativeCluster",
                "size": 3938
            }, {
                "name": "CommunityStructure",
                "size": 3812
            }]
        }, {
            "name": "graph",
            "children": [{
                "name": "BetweennessCentrality",
                "size": 3534
            }, {
                "name": "SpanningTree",
                "size": 3416
            }]
        }]

如果每个子项都包含自己的子项怎么办，我们如何为子项嵌套项显示可折叠树？例如，

"name": "flare",
        "children": [{
            "name": "analytics",
            "children": [{
                "name": "cluster",
                "children": [{
                    "name": "AgglomerativeCluster",
                    "size": 3938
                     children: [{
                        "name": "children nested children1",
                        "size": "123"
                     }]
                }, {
                    "name": "CommunityStructure",
                    "size": 3812
                }]
            }]
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