d3.js 轮状树图，有折叠展开

   参考网上的例子  从新实现了下轮状树图：  

   <script type="text/javascript" src="src/lib/d3.min.js"></script>
      <script type="text/javascript" src="src/lib/d3.layout.js"></script> 

核心代码：

export default{
//初始化轮状图
initlun:function(classpath,data){
   
    var width = document.body.clientWidth;
    var height = document.body.clientHeight-65;
             //图像区域大小
     var R = 600;
     //动画持续时间
     var duration=1000;
     //节点编号
     var index=0;
      
     //定义一个Tree对象,定义旋转角度和最大半径
     var tree = d3.layout.tree()
     .size([360,R/2-120])
     .separation(function(a,b) { return (a.parent == b.parent ? 1 : 2)/a.depth;});
      
     //定义布局方向
     var diagonal = d3.svg.diagonal()
     .projection(function(d) {
     var r = d.y, a = (d.x-90) / 180 * Math.PI;
     return [r * Math.cos(a), r * Math.sin(a)];
     });
      
     //新建画布，移动到圆心位置
     var svg = d3.select(classpath).append("svg")
     .attr("width", width)
     .attr("height", height)
     .append("g")
     .attr("transform", function(d){ return "translate("+R/2+"," + R/2 + ")";});
      
     //根据JSON数据生成树
/*     d3.json("treeDataC.php", function(error, data) {*/
      
     var root=data;
      
     //根据数据生成nodes集合
     var nodes = tree.nodes(data);
      
     //记录现在的位置
     nodes.forEach(function(d){
     d.x0 = d.x;
     d.y0 = d.y;
     });
      
     //获取node集合的关系集合
     var links = tree.links(nodes);
      
     //根据node集合生成节点,添加id是为了区分是否冗余的节点
     var node = svg.selectAll(".node")
     .data(nodes,function(d){return d.id|| (d.id = ++index);});
      
     //为关系集合设置贝塞尔曲线连接
     var link=svg.selectAll(".link")
     .data(links, function(d) { return d.target.id;})
     .enter()
     .append("path")
     .attr("class", "link")
     .attr("d",diagonal);
      
     node.enter()
     .append("g")
     .attr("class", "node")
     .attr("transform",function(d){return "rotate(" + (d.x-90) + ")translate(" + d.y + ")"; })
     .on("click",nodeClick);
      
     //为节点添加圆形标记,如果有子节点为红色，否则绿色
     node.append("circle")
     .attr("fill",function(d){return d.children==null?"#0F0":"#F00";})
     .attr("r", 5);
      
     //为节点添加说明文字
     node.append("text")
     .attr("dy", ".4em")
     .text(function(d){return d.level;})
     .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
     .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; });
      
     //点击的话，隐藏或者显示子节点
     function nodeClick(d)
     {
     if (d.children)
     {
     d._children = d.children;
     d.children = null;
     }
     else
     {
     d.children = d._children;
     d._children = null;
     }
     update(d);
     }
      
     //更新显示
     function update(source)
     {
     //取得现有的节点数据,因为设置了Children属性，没有Children的节点将被删除
     var nodes = tree.nodes(root).reverse();
     var links = tree.links(nodes);
      
     //为节点更新数据
     var node = svg.selectAll("g.node")
     .data(nodes,function(d){return d.id|| (d.id = ++index);});
      
     //为链接更新数据
     var link = svg.selectAll("path.link").data(links, function(d) {return d.target.id;});
      
     //更新链接
     link.enter()
     .append("path")
     .attr("class", "link")
     .attr("d", function(d) {
     var o = {x: source.x, y: source.y};
     return diagonal({source: o, target: o});
     });
      
     link.transition()
     .duration(duration)
     .attr("d",diagonal);
      
     //移除无用的链接
     link.exit()
     .transition()
     .duration(duration)
     .attr("d", function(d) {
     var o = {x: source.x, y: source.y};
     return diagonal({source: o, target: o});
     })
     .remove();
      
     //更新节点集合
     var nodeEnter = node.enter()
     .append("g")
     .attr("class", "node")
     .attr("transform",function(d){return "rotate(" + (source.x0-90) + ")translate(" + source.y0 + ")"; })
     .on("click",nodeClick);
      
     //为节点添加圆形标记,如果有子节点为红色，否则绿色
     node.append("circle")
     .attr("fill",function(d){return d.children==null && d._children==null?"#0F0":"#F00";})
     .attr("r", 5);
      
     //为节点添加说明文字
     node.append("text")
     .attr("dy", ".4em")
     .text(function(d){return d.level;})
     .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
     .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; });
      
     //节点动画
     var nodeUpdate = node.transition()
     .duration(duration)
     .attr("transform", function(d) { return "rotate(" + (d.x-90) + ")translate(" + d.y + ")"; });
      
     //将无用的子节点删除
     var nodeExit =node.exit()
     .transition()
     .duration(duration)
     .attr("transform", function(d){return "rotate(" + (source.x-90) + ")translate(" + source.y + ")"; })
     .remove();
      
     //记录下当前位置,为下次动画记录初始值
     nodes.forEach(function(d) {
     d.x0 = d.x;
     d.y0 = d.y;
     });
     }
     /*});*/
}
}

数据结构：

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