树状图(竖着)

d3.json("city.json", function (err, data) {
        const width = 700, height = 800, padding = {top: 60, left: 30};
        const svg = d3.select("body").append("svg")
            .attr("width", width + padding.left * 2)
            .attr("height", height + padding.top * 2).append("g")
            .attr("transform", "translate(40,50)");
        const tree = d3.layout.tree()
            .size([width, height - 200])
            .separation(function (a, b) {
//点与点之间的间隔比例
                return a.parent === b.parent ? 1: 2;
            });
//        nodes:
//        [{name: "中国",
//          children: Array(3),
//          depth: 0,
//          x: 350,
//          y: 0}
//          ,...]
        const nodes = tree.nodes(data);
//        links:
//        [
//         {source:node,
//         target:node}
//          ,...]
        const color = d3.scale.category20();
        const links = tree.links(nodes);
        const diagonal = d3.svg.diagonal()
            .projection(function (d) {
                return [d.x, d.y]
            });
        const link = svg.selectAll(".link")
            .data(links)
            .enter()
            .append("path")
            .attr("class", "link")
            .attr("d", diagonal)
            .attr("fill", "none")
            .attr("stroke", "purple")
            .attr("stroke-width", 2);

        const node = svg.selectAll(".node")
            .data(nodes)
            .enter()
            .append("g")
            .attr("class", "node")
            .attr("transform", function (d) {
                return "translate(" + d.x + "," + d.y + ")";
            });
        node.append("circle")
            .attr("r", 4.5)
            .attr("fill",function (d,i) {
                return color(i);
            });
        node.append("text")
            .attr("dy", function (d) {
                return d.children ? -14 : 20;
            })
            .style("text-anchor","middle")
            .text(function (d) {
                return d.name;
            })
    })

结果:

竖着

横着

d3.json("city.json", function (err, data) {
        const width = 700, height = 600, padding = {top: 60, left: 30};
        const svg = d3.select("body").append("svg")
            .attr("width", width + padding.left * 2)
            .attr("height", height + padding.top * 2).append("g")
            .attr("transform", "translate(100,0)");
        const tree = d3.layout.tree()
            .size([width, height - 200])
            .separation(function (a, b) {
                console.log(a);
                console.log(b);
                return a.parent === b.parent ? 1 : 2;
            });
//        nodes:
//        [{name: "中国",
//          children: Array(3),
//          depth: 0,
//          x: 350,
//          y: 0}
//          ,...]
        const nodes = tree.nodes(data);
//        links:
//        [
//         {source:node,
//         target:node}
//          ,...]
        const links = tree.links(nodes);
        const diagonal = d3.svg.diagonal()
            .projection(function (d) {
                return [d.y, d.x]
            });
        const link = svg.selectAll(".link")
            .data(links)
            .enter()
            .append("path")
            .attr("class", "link")
            .attr("d", diagonal)
            .attr("fill", "none")
            .attr("stroke", "purple")
            .attr("stroke-width", 2);

        const node = svg.selectAll(".node")
            .data(nodes)
            .enter()
            .append("g")
            .attr("class", "node")
            .attr("transform", function (d) {
                return "translate(" + d.y + "," + d.x + ")";
            });
        node.append("circle")
            .attr("r", 4.5);
        node.append("text")
            .attr("dx", function (d) {
                return d.children ? -8 : 8;
            })
            .attr("dy", 3)
            .style("text-anchor", function (d) {
                return d.children ? "end" : "start"
            })
            .text(function (d) {
                return d.name;
            })
    })

结果:

横着