Javascript 在 d3.js 中更改家谱中的家庭成员 colored颜色

var treeData = {
  name: " physic ",

  children: [
    {
      name: "Classical Physics ",
      children: [
        {
          name: "Relativistic Physics"
        },

        {
          name: "Quantum Mechanics"
        }
      ]
    },

    {
      name: "Modern Physics"
    },
    {
      name: "Atomic Physics"
    }
  ]
};

var colorSchema = {
  "Relativistic Physics": "red",
  "Modern Physics": "yellow"
};
// Set the dimensions and margins of the diagram
var margin = { top: 20, right: 120, bottom: 30, left: 120 },
  width = 3000 - margin.left - margin.right,
  height = 800 - margin.top - margin.bottom;

// append the svg object to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3
  .select("body")
  .append("svg")
  .attr("width", width + margin.right + margin.left)
  .attr("height", height + margin.top + margin.bottom)
  .append("g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var i = 0,
  duration = 750,
  root;

// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);

// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function (d) {
  return d.children;
});
root.x0 = height / 2;
root.y0 = 0;

// Collapse after the second level
root.children.forEach(collapse);

update(root);

// Collapse the node and all it's children
function collapse(d) {
  if (d.children) {
    d._children = d.children;
    d._children.forEach(collapse);
    d.children = null;
  }
}

function update(source) {
  // Assigns the x and y position for the nodes
  var treeData = treemap(root);

  // Compute the new tree layout.
  var nodes = treeData.descendants(),
    links = treeData.descendants().slice(1);

  // Normalize for fixed-depth.
  nodes.forEach(function (d) {
    d.y = d.depth * 180;
  });

  // ****************** Nodes section ***************************

  // Update the nodes...
  var node = svg.selectAll("g.node").data(nodes, function (d) {
    return d.id || (d.id = ++i);
  });

  // Enter any new modes at the parent's previous position.
  var nodeEnter = node
    .enter()
    .append("g")
    .attr("class", "node")
    .attr("transform", function (d) {
      return "translate(" + source.y0 + "," + source.x0 + ")";
    })
    .on("click", click);

  // Add Circle for the nodes
  nodeEnter
    .append("circle")
    .attr("class", "node")
    .attr("r", 1e-6)
    .style("fill", function (d) {
      return d._children ? "red" : "yellow";
    });

  // Add labels for the nodes
  nodeEnter
    .append("text")
    .attr("dy", ".35em")
    .attr("x", function (d) {
      return d.children || d._children ? -13 : 13;
    })
    .attr("text-anchor", function (d) {
      return d.children || d._children ? "end" : "start";
    })
    .text(function (d) {
      return d.data.name;
    });

  // UPDATE
  var nodeUpdate = nodeEnter.merge(node);

  // Transition to the proper position for the node
  nodeUpdate
    .transition()
    .duration(duration)
    .attr("transform", function (d) {
      return "translate(" + d.y + "," + d.x + ")";
    });

  // Update the node attributes and style
  nodeUpdate
    .select("circle.node")
    .attr("r", 10)
    .style("fill", function (d) {
      return (
        colorSchema[d.data.name] || (d._children ? "lightsteelblue" : "#fff")
      );
    })
    .attr("cursor", "pointer");

  // Remove any exiting nodes
  var nodeExit = node
    .exit()
    .transition()
    .duration(duration)
    .attr("transform", function (d) {
      return "translate(" + source.y + "," + source.x + ")";
    })
    .remove();

  // On exit reduce the node circles size to 0
  nodeExit.select("circle").attr("r", 1e-6);

  // On exit reduce the opacity of text labels
  nodeExit.select("text").style("fill-opacity", 1e-6);

  // ****************** links section ***************************

  // Update the links...
  var link = svg.selectAll("path.link").data(links, function (d) {
    return d.id;
  });

  // Enter any new links at the parent's previous position.
  var linkEnter = link
    .enter()
    .insert("path", "g")
    .attr("class", "link")
    .attr("d", function (d) {
      var o = { x: source.x0, y: source.y0 };
      return diagonal(o, o);
    });

  // UPDATE
  var linkUpdate = linkEnter.merge(link);

  // Transition back to the parent element position
  linkUpdate
    .transition()
    .duration(duration)
    .attr("d", function (d) {
      return diagonal(d, d.parent);
    });

  // Remove any exiting links
  var linkExit = link
    .exit()
    .transition()
    .duration(duration)
    .attr("d", function (d) {
      var o = { x: source.x, y: source.y };
      return diagonal(o, o);
    })
    .remove();

  // Store the old positions for transition.
  nodes.forEach(function (d) {
    d.x0 = d.x;
    d.y0 = d.y;
  });

  // Creates a curved (diagonal) path from parent to the child nodes
  function diagonal(s, d) {
    path = `M ${s.y} ${s.x}
            C ${(s.y + d.y) / 2} ${s.x},
              ${(s.y + d.y) / 2} ${d.x},
              ${d.y} ${d.x}`;

    return path;
  }

  // Toggle children on click.
  function click(d) {
    if (d.children) {
      d._children = d.children;
      d.children = null;
    } else {
      d.children = d._children;
      d._children = null;
    }
    update(d);
  }
}

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;

  font-weight: bold;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}

.color {
  color: #ff0000;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>