我一直在尝试在Node.js中调用D3。我首先尝试使用脚本标签从D3的网站导入d3.v2.js

D3的作者建议一个人应该“ npm install d3” …我做到了，我可以在节点控制台中成功调用它：

dpc@ananda:$ node
> var d3 = require("d3");
undefined
> d3.version;
'2.8.1'

但是，当尝试使用“ node app.js”从app.js调用它时，我得到：

node.js:201
    throw e; // process.nextTick error, or 'error' event on first tick
          ^
TypeError: Cannot read property 'BSON' of undefined
at     /Users/dpc/Dropbox/sync/Business/MindfulSound/Development/nad.am/nadam/node_modules/mongoose/node_modules/mongodb/lib/mongodb/index.js:45:44

我意识到，D3的作者在其他地方已经明确规定了应该使用画布：

https://github.com/mbostock/d3/blob/master/examples/node-canvas/us-
counties.js

如：

var Canvas = require("canvas");

但是即使如此，（即使在app.js的require语句中特别要求使用index.js而不是d3.v2.js），我也无法在Jade模板中进行以下操作：

- script('/javascripts/d3.v2.js')
h1 Dashboard
  section.css-table
    section.two-column
      section.cell
        hr.grey
        h2 Statistics
        #mainGraph
            script(type="text/javascript") 
              var Canvas = require("canvas");
              var w = 400,
                  h = 400,
                  r = Math.min(w, h) / 2,
                  data = d3.range(10).map(Math.random).sort(d3.descending),
                  color = d3.scale.category20(),
                  arc = d3.svg.arc().outerRadius(r),
                  donut = d3.layout.pie();
              var vis = d3.select("body").append("svg")
                  .data([data])
                  .attr("width", w)
                  .attr("height", h);
              var arcs = vis.selectAll("g.arc")
                  .data(donut)
                  .enter().append("g")
                  .attr("class", "arc")
                  .attr("transform", "translate(" + r + "," + r + ")");
              var paths = arcs.append("path")
                  .attr("fill", function(d, i) { return color(i); });
              paths.transition()
                  .ease("bounce")
                  .duration(2000)
                  .attrTween("d", tweenPie);
              paths.transition()
                  .ease("elastic")
                  .delay(function(d, i) { return 2000 + i * 50; })
                  .duration(750)
                  .attrTween("d", tweenDonut);

              function tweenPie(b) {
                b.innerRadius = 0;
                var i = d3.interpolate({startAngle: 0, endAngle: 0}, b);
                return function(t) {
                  return arc(i(t));
                };
              }

              function tweenDonut(b) {
                b.innerRadius = r * .6;
                var i = d3.interpolate({innerRadius: 0}, b);
                return function(t) {
                  return arc(i(t));
                };

      section.cell
        hr.grey
        h2 Achievements