对sankey图中节点之间的链接进行着色: networkD3

var links = [
  {source: "A", target: "B", value: 50},
  {source: "A", target: "C", value: 30},
  {source: "B", target: "C", value: 20}
];

var svg = d3.select("svg");
var sankey = d3.sankey()
  .nodeWidth(15)
  .nodePadding(10)
  .size([width, height]);

var {nodes, links} = sankey({nodes: nodes, links: links});

svg.append("g")
  .selectAll("path")
  .data(links)
  .enter().append("path")
  .attr("class", "link")
  .attr("d", d3.sankeyLinkHorizontal())
  .style("stroke", function(d) { return d.color; })
  .style("stroke-width", function(d) { return Math.max(1, d.width); })
  .style("fill", "none");