'How to change the color of a node based on changed data in d3?

nodes = g.append("g")
           .attr("class", "net_node")
           .selectAll("circle")
           .data(data).enter()
           .append("circle")
           .attr("fill", function(d) {
                return color.palette(d.group);
                })

The nodes are defined as follows.

In the pallete, colors are assigned according to the group number.

I do not know the current method, so when other data is input, I delete the svg and run it again.

svg.remove();
view(new_data);

How to change nodes.data and change color

I've read a lot of posts and tried a lot but still can't figure out the answer

thank you.

javascript d3.js

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'How to change the color of a node based on changed data in d3?

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