Javascript 为什么我的d3地图上的悬停不能正常工作？

我正在用d3构建一个地图，但由于某些原因，悬停不能正常工作。很多时候，我将鼠标悬停在一个功能上，它不会通过改变颜色来做出反应，只是在反复这样做之后。有些功能根本不起作用

var svg=d3.选择（“#映射”）；
可变宽度=960，
高度=500；
var gemeinden={
“类型”：“FeatureCollection”，
“名称”：“单一部分统计数据”，
“crs”：{
“类型”：“名称”，
“财产”：{
“名称”：“urn:ogc:def:crs:ogc:1.3:CRS84”
}
},
“特点”：[{
“类型”：“功能”，
“财产”：{
“id”：空，
“fid”：2322，
“GEN”：“Bielefeld”，
“LSG_perc”：48.03，
“perc_5km”：94.43，
“pop_dens”：1260，
“perc_10km”：100.0，
“pop_tot”：326428
},
“几何学”：{
“类型”：“多边形”，
“坐标”：[
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]
]
}
},
{
“类型”：“功能”，
“财产”：{
“id”：空，
“fid”：2323，
“GEN”：“Borgholzhausen”，
“LSG_perc”：62.17，
“perc_5km”：96.32，
“pop_dens”：154，
“perc_10km”：100.0，
“pop_tot”：8696
},
“几何学”：{
“类型”：“多边形”，
“坐标”：[
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