Question

我试图通过略微修改来复制下面的例子。我没有从左到右的方向，而是将方向从上到下改变。我成功地根据Json中的size参数改变了节点大小。

https://bl.ocks.org/d3noob/43a860bc0024792f8803bba8ca0d5ecd

我遇到的问题是分支机构没有均匀分布。请参考下面的图片。

请参阅附带的代码以便进行调试

<!DOCTYPE html>
<meta charset="UTF-8">
<style>
div.container {
    width: 100%;
    border: 1px solid gray;
}

header, footer {
    padding: 1em;
    color: white;
    background-color: red;
    clear: left;
    text-align: center;
}

nav {
    float: left;
    max-width: 160px;
    margin: 0;
    padding: 1em;
}

nav ul {
    list-style-type: none;
    padding: 0;
}
   
nav ul a {
    text-decoration: none;
}

article {
    margin-left: 170px;
    border-left: 1px solid gray;
    padding: 1em;
    overflow: hidden;
}

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;
  transform: rotate(45deg);
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}

div.tooltip {
	position: absolute;
	text-align: center;
	width: 100px;
	height: 10px;
	padding: 8px;
	font: 10px sans-serif;
	background: #ffff99;
	border: solid 1px #aaa;
	border-radius: 8px;
	pointer-events: none;
}

</style>

<body bgcolor = '#F0FFF0'>

<!-- load the d3.js library -->	
<script src="https://d3js.org/d3.v4.min.js"></script>


<div align = "left">
<script>

var treeData =
{
  "name": "AON",
  "size": 4,
  "children": [
    {
      "name": "India",
      "size": 4,
      "children": [
        {
          "name": "ARS",
          "size": 4,
          "children": [
            {
              "name": "AAA",
              "size": 4
            },
            {
              "name": "BBB",
              "size": 4
            },
            {
              "name": "cCC",
              "size": 8
            },
            {
              "name": "ddd",
              "size": 4
            },
            {
              "name": "eee",
              "size": 4
            },
            {
              "name": "fff",
              "size": 4
            },
            {
              "name": "ggg",
              "size": 4
            },
            {
              "name": "hhh",
              "size": 4
            },
            {
              "name": "www",
              "size": 4
            },
            {
              "name": "qwww",
              "size": 8
            },
            {
              "name": "sd",
              "size": 4
            },
            {
              "name": "tere",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "rtr",
              "size": 4
            },
			{
              "name": "AAA",
              "size": 4
            },
            {
              "name": "BBB",
              "size": 4
            },
            {
              "name": "cCC",
              "size": 8
            },
            {
              "name": "ddd",
              "size": 4
            },
            {
              "name": "eee",
              "size": 4
            },
            {
              "name": "fff",
              "size": 4
            },
            {
              "name": "ggg",
              "size": 4
            },
            {
              "name": "hhh",
              "size": 4
            },
            {
              "name": "www",
              "size": 4
            },
            {
              "name": "qwww",
              "size": 8
            },
            {
              "name": "sd",
              "size": 4
            },
            {
              "name": "tere",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "rtr",
              "size": 4
            },
            {
              "name": "wqw",
              "size": 4
            },
            {
              "name": "hrfg",
              "size": 4
            }
          ]
        }
      ]
    },
    {
      "name": "Singapore",
      "size": 4,
      "children": [
        {
          "name": "H&B",
          "size": 4,
          "children": [
            {
              "name": "aasd",
              "size": 4
            },
            {
              "name": "sdw",
              "size": 4
            },
            {
              "name": "ghrr",
              "size": 4
            },
            {
              "name": "tyr",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "ere",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "eds",
              "size": 4
            },
            {
              "name": "hrtr",
              "size": 8
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "uyt",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "wewe",
              "size": 4
            },
            {
              "name": "yrt",
              "size": 4
            },
            {
              "name": "uyu",
              "size": 4
            },
            {
              "name": "erewr",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "kyjy",
              "size": 4
            }
          ]
        },
        {
          "name": "GCP",
          "size": 4,
          "children": [
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "sdsf",
              "size": 4
            },
            {
              "name": "wewt",
              "size": 4
            },
            {
              "name": "wetdse",
              "size": 4
            },
            {
              "name": "wetw",
              "size": 4
            },
            {
              "name": "qwsd",
              "size": 4
            },
            {
              "name": "yrytw",
              "size": 4
            },
            {
              "name": "wewax",
              "size": 4
            },
            {
              "name": "jttut",
              "size": 4
            },
            {
              "name": "scscw",
              "size": 4
            },
            {
              "name": "wetvd",
              "size": 4
            },
            {
              "name": "wewe",
              "size": 4
            },
            {
              "name": "zc",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "zerete",
              "size": 8
            },
            {
              "name": "sdaxa",
              "size": 4
            },
            {
              "name": "yeer",
              "size": 4
            },
            {
              "name": "sdaxa",
              "size": 4
            },
            {
              "name": "wewretre",
              "size": 4
            },
            {
              "name": "ssdsrere",
              "size": 4
            },
            {
              "name": "asdsdere",
              "size": 4
            },
            {
              "name": "asdsdere",
              "size": 4
            }
          ]
        }
      ]
    },
    {
      "name": "US",
      "size": 4,
      "children": [
        {
          "name": "Benfield",
          "size": 4,
          "children": [
            {
              "name": "wes",
              "size": 4
            },
            {
              "name": "sd",
              "size": 4
            },
            {
              "name": "dds",
              "size": 4
            },
            {
              "name": "sdsd",
              "size": 4
            },
            {
              "name": "ere",
              "size": 4
            },
            {
              "name": "ryr",
              "size": 4
            },
            {
              "name": "ty",
              "size": 4
            },
            {
              "name": "wewe",
              "size": 4
            },
            {
              "name": "ggrt",
              "size": 4
            },
            {
              "name": "wetyr",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "hrfg",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "hhf",
              "size": 8
            },
            {
              "name": "ere",
              "size": 4
            },
            {
              "name": "vfgd",
              "size": 4
            }
          ]
        },
        {
          "name": "GCP",
          "size": 4,
          "children": [
            {
              "name": "xx",
              "size": 4
            },
            {
              "name": "wqwq",
              "size": 4
            },
            {
              "name": "xasa",
              "size": 4
            },
            {
              "name": "ooo",
              "size": 4
            },
            {
              "name": "ppp",
              "size": 4
            },
            {
              "name": "ll",
              "size": 4
            },
            {
              "name": "lljk",
              "size": 4
            },
            {
              "name": "kjjk",
              "size": 4
            },
            {
              "name": "kui",
              "size": 4
            },
            {
              "name": "yu",
              "size": 4
            },
            {
              "name": "li",
              "size": 4
            },
            {
              "name": "uyu",
              "size": 4
            },
            {
              "name": "yuik",
              "size": 4
            },
            {
              "name": "yjm",
              "size": 4
            },
            {
              "name": "yu",
              "size": 4
            },
            {
              "name": "yikm",
              "size": 4
            },
            {
              "name": "yu",
              "size": 8
            },
            {
              "name": "mmui",
              "size": 4
            },
            {
              "name": "yum",
              "size": 4
            },
            {
              "name": "kyuyy",
              "size": 4
            },
            {
              "name": "dffgy",
              "size": 4
            },
            {
              "name": "erfdr",
              "size": 4
            }
          ]
        }
      ]
    }
  ]
}
  ;

// Set the dimensions and margins of the diagram
var margin = {top: 30, right: 120, bottom: 20, left: 120},
    //width = 960 - margin.left - margin.right,
    //height = 500 - margin.top - margin.bottom;
	width = 1000,
	height = 550;

// 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("
          + 400 + "," + margin.top + ")"); //580 is close to center

// Add tooltip div
var div = d3.select("body").append("div")
	.attr("class", "tooltip")
	.style("opacity", 1e-6);
	
var i = 0,
    duration = 750,
    root;

// declares a tree layout and assigns the size
var treemap = d3.cluster().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 * 160; });

  // ****************** 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.x0 + "," + source.y0 + ")";
    })
    .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 ? "lightsteelblue" : "#fff";
      });

  // Add labels for the nodes
	nodeEnter.append('text')
      .attr("dy", ".35em")
      .attr("y", function(d) {
          return d.children || d._children ? -18 : 18;
      })
      .attr("text-anchor", function(d) {
          return d.children || d._children ? "end" : "start";
      })
     .attr("dy", function(d) {
      return d.children || d._children ? "2em" : "-1em";
     })
    .attr("dx", function(d) {
        return d.children || d._children ? "-1em" : "1em";
     })
      .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.x + "," + d.y + ")";
     });

  // Update the node attributes and style
  nodeUpdate.select('circle.node')
    //.attr('r', 10)
	.attr('r',function(d) { return d.data.size;  })
    .style("fill", function(d) {
        return d._children ? "lightsteelblue" : "#fff";
    })
    .attr('cursor', 'pointer')
	.on("mouseover", mouseover)
    .on("mousemove", function(d){mousemove(d);})
	.on("mouseout", mouseout);

	function mouseover() {
		div.transition()
		.duration(300)
		.style("opacity", 1);
	}

	function mousemove(d) {
		div
		.text(d.data.name)
		.style("left", (d3.event.pageX ) + "px")
		.style("top", (d3.event.pageY) + "px");
	}

	function mouseout() {
		div.transition()
		.duration(300)
		.style("opacity", 1e-6);
	}
	
  // Remove any exiting nodes
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) {
          return "translate(" + source.x + "," + source.y + ")";
      })
      .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.y0+200, y: source.x0+200}
        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.y+200, y: source.x+200}
        return diagonal(o, o)
      })
      .remove();

  // Store the old positions for transition.
  nodes.forEach(function(d){
    d.x0 = d.y;
    d.y0 = d.x;
  });

  // Creates a curved (diagonal) path from parent to the child nodes
  function diagonal(s, d) {

    path = `M ${s.x} ${s.y}
            C ${(s.x + d.x) / 2} ${s.y},
              ${(s.x + d.x) / 2} ${d.y},
              ${d.x} ${d.y}`

    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);
  }
}

</script>
</div>
<div align="right">
	<img src="aon.png" alt="Mountain View" style="width:200px;height:100px;">
</div>

</body>

请告诉我需要修改的位置，以确保链接和文字不会相互重叠。

Answer 1

使用d3.cluster而不是d3.tree会更好地传播中间分支（即删除屏幕截图中benfield和cp之间的冲突）

然后旋转标签是阻止他们互相覆盖的最快捷方式，这只是一个css规则：

.node text {
  font: 12px sans-serif;
  transform: rotate(45deg);
}

我还为你设置的d3文本属性添加了几个dx / dy偏移量，以使它们更好地对齐（根据锚点位置旋转将它们略微抛出）

这只能让你到目前为止，如果你扩展所有你看到底部标签仍然重叠的东西，你需要使它更宽或限制可以在底层打开的分支数量

<!DOCTYPE html>
<meta charset="UTF-8">
<style>
div.container {
    width: 100%;
    border: 1px solid gray;
}

header, footer {
    padding: 1em;
    color: white;
    background-color: red;
    clear: left;
    text-align: center;
}

nav {
    float: left;
    max-width: 160px;
    margin: 0;
    padding: 1em;
}

nav ul {
    list-style-type: none;
    padding: 0;
}
   
nav ul a {
    text-decoration: none;
}

article {
    margin-left: 170px;
    border-left: 1px solid gray;
    padding: 1em;
    overflow: hidden;
}

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;
  transform: rotate(45deg);
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}

</style>

<body >

<!-- load the d3.js library -->	
<script src="https://d3js.org/d3.v4.min.js"></script>


<div align = "left">
<script>

var treeData =
{
  "name": "AON",
  "size": 4,
  "children": [
    {
      "name": "India",
      "size": 4,
      "children": [
        {
          "name": "ARS",
          "size": 4,
          "children": [
            {
              "name": "AAA",
              "size": 4
            },
            {
              "name": "BBB",
              "size": 4
            },
            {
              "name": "cCC",
              "size": 8
            },
            {
              "name": "ddd",
              "size": 4
            },
            {
              "name": "eee",
              "size": 4
            },
            {
              "name": "fff",
              "size": 4
            },
            {
              "name": "ggg",
              "size": 4
            },
            {
              "name": "hhh",
              "size": 4
            },
            {
              "name": "www",
              "size": 4
            },
            {
              "name": "qwww",
              "size": 8
            },
            {
              "name": "sd",
              "size": 4
            },
            {
              "name": "tere",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "rtr",
              "size": 4
            },
            {
              "name": "wqw",
              "size": 4
            },
            {
              "name": "hrfg",
              "size": 4
            }
          ]
        }
      ]
    },
    {
      "name": "Singapore",
      "size": 4,
      "children": [
        {
          "name": "H&B",
          "size": 4,
          "children": [
            {
              "name": "aasd",
              "size": 4
            },
            {
              "name": "sdw",
              "size": 4
            },
            {
              "name": "ghrr",
              "size": 4
            },
            {
              "name": "tyr",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "ere",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "eds",
              "size": 4
            },
            {
              "name": "hrtr",
              "size": 8
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "uyt",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "wewe",
              "size": 4
            },
            {
              "name": "yrt",
              "size": 4
            },
            {
              "name": "uyu",
              "size": 4
            },
            {
              "name": "erewr",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "kyjy",
              "size": 4
            }
          ]
        },
        {
          "name": "GCP",
          "size": 4,
          "children": [
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "sdsf",
              "size": 4
            },
            {
              "name": "wewt",
              "size": 4
            },
            {
              "name": "wetdse",
              "size": 4
            },
            {
              "name": "wetw",
              "size": 4
            },
            {
              "name": "qwsd",
              "size": 4
            },
            {
              "name": "yrytw",
              "size": 4
            },
            {
              "name": "wewax",
              "size": 4
            },
            {
              "name": "jttut",
              "size": 4
            },
            {
              "name": "scscw",
              "size": 4
            },
            {
              "name": "wetvd",
              "size": 4
            },
            {
              "name": "wewe",
              "size": 4
            },
            {
              "name": "zc",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "zerete",
              "size": 8
            },
            {
              "name": "sdaxa",
              "size": 4
            },
            {
              "name": "yeer",
              "size": 4
            },
            {
              "name": "sdaxa",
              "size": 4
            },
            {
              "name": "wewretre",
              "size": 4
            },
            {
              "name": "ssdsrere",
              "size": 4
            },
            {
              "name": "asdsdere",
              "size": 4
            },
            {
              "name": "asdsdere",
              "size": 4
            }
          ]
        }
      ]
    },
    {
      "name": "US",
      "size": 4,
      "children": [
        {
          "name": "Benfield",
          "size": 4,
          "children": [
            {
              "name": "wes",
              "size": 4
            },
            {
              "name": "sd",
              "size": 4
            },
            {
              "name": "dds",
              "size": 4
            },
            {
              "name": "sdsd",
              "size": 4
            },
            {
              "name": "ere",
              "size": 4
            },
            {
              "name": "ryr",
              "size": 4
            },
            {
              "name": "ty",
              "size": 4
            },
            {
              "name": "wewe",
              "size": 4
            },
            {
              "name": "ggrt",
              "size": 4
            },
            {
              "name": "wetyr",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "hrfg",
              "size": 4
            },
            {
              "name": "wew",
              "size": 4
            },
            {
              "name": "hhf",
              "size": 8
            },
            {
              "name": "ere",
              "size": 4
            },
            {
              "name": "vfgd",
              "size": 4
            }
          ]
        },
        {
          "name": "GCP",
          "size": 4,
          "children": [
            {
              "name": "xx",
              "size": 4
            },
            {
              "name": "wqwq",
              "size": 4
            },
            {
              "name": "xasa",
              "size": 4
            },
            {
              "name": "ooo",
              "size": 4
            },
            {
              "name": "ppp",
              "size": 4
            },
            {
              "name": "ll",
              "size": 4
            },
            {
              "name": "lljk",
              "size": 4
            },
            {
              "name": "kjjk",
              "size": 4
            },
            {
              "name": "kui",
              "size": 4
            },
            {
              "name": "yu",
              "size": 4
            },
            {
              "name": "li",
              "size": 4
            },
            {
              "name": "uyu",
              "size": 4
            },
            {
              "name": "yuik",
              "size": 4
            },
            {
              "name": "yjm",
              "size": 4
            },
            {
              "name": "yu",
              "size": 4
            },
            {
              "name": "yikm",
              "size": 4
            },
            {
              "name": "yu",
              "size": 8
            },
            {
              "name": "mmui",
              "size": 4
            },
            {
              "name": "yum",
              "size": 4
            },
            {
              "name": "kyuyy",
              "size": 4
            },
            {
              "name": "dffgy",
              "size": 4
            },
            {
              "name": "erfdr",
              "size": 4
            }
          ]
        }
      ]
    }
  ]
}
  ;

// Set the dimensions and margins of the diagram
var margin = {top: 30, right: 120, bottom: 20, left: 120},
    //width = 960 - margin.left - margin.right,
    //height = 500 - margin.top - margin.bottom;
	width = 1000,
	height = 600;

// 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("
          + 580 + "," + margin.top + ")"); //580 is close to center

var i = 0,
    duration = 750,
    root;

// declares a tree layout and assigns the size
var treemap = d3.cluster().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 * 160; });

  // ****************** 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.x0 + "," + source.y0 + ")";
    })
    .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 ? "lightsteelblue" : "#fff";
      });

  // Add labels for the nodes
	nodeEnter.append('text')
      .attr("dy", ".35em")
      .attr("y", function(d) {
          return d.children || d._children ? -18 : 18;
      })
      .attr("text-anchor", function(d) {
          return d.children || d._children ? "end" : "start";
      })
     .attr("dy", function(d) {
      return d.children || d._children ? "2em" : "-1em";
     })
    .attr("dx", function(d) {
        return d.children || d._children ? "-1em" : "1em";
     })
      .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.x + "," + d.y + ")";
     });

  // Update the node attributes and style
  nodeUpdate.select('circle.node')
    //.attr('r', 10)
	.attr('r',function(d) { return d.data.size;  })
    .style("fill", function(d) {
        return 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.x + "," + source.y + ")";
      })
      .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.y0, y: source.x0}
        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.y, y: source.x}
        return diagonal(o, o)
      })
      .remove();

  // Store the old positions for transition.
  nodes.forEach(function(d){
    d.x0 = d.y;
    d.y0 = d.x;
  });

  // Creates a curved (diagonal) path from parent to the child nodes
  function diagonal(s, d) {

    path = `M ${s.x} ${s.y}
            C ${(s.x + d.x) / 2} ${s.y},
              ${(s.x + d.x) / 2} ${d.y},
              ${d.x} ${d.y}`

    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);
  }
}

</script>
</div>
<div align="right">
	<img src="aon.png" alt="Mountain View" style="width:200px;height:100px;">
</div>

</body>

可折叠树布局。均匀分布分支

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