node是包含所有组的选择(我想它们是组，因为您没有复制/粘贴整个选择).

node is a selection containing all your groups (I suppose they are groups, since you didn't copy/paste the entire selection).

如果只想在被单击的组中执行任何操作，则必须使用d3.select(this)进行选择，该操作将选择当前(在您的情况下为被单击的)DOM元素.

If you want to do anything only in the clicked group, you have to select it using d3.select(this), which selects the current (in your case, the clicked) DOM element.

因此，而不是:

node.select("text")

应该是:

d3.select(this).select("text")