我有一个应用程序，我需要使用D3制作网格。我还需要获取它们的值。因此我的应用程序具有使用鼠标拖动选择的能力，现在我需要在控制台中的值。这是......
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<meta charset="utf-8">
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这是json
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我需要在应用程序运行时使用鼠标拖动选择节点，值将进入控制台