问d3:缩放到国家而不是国家的边界框II

EN

var projection = d3.geo.mercator() // instead of albersUsa
    .scale(100)
    .translate([width / 2, height / 2]);

d3.json("world-110m.json", function(error, world) { //world json
  if (error) throw error;

  g.selectAll("path")
    .data(topojson.feature(world, world.objects.countries).features) //traverse world objects instead of state objects
    .enter().append("path")
  .attr("d", path)
  .attr("class", "feature")
  .on("click", clicked);

  g.append("path")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) // append world objects not states
      .attr("class", "mesh")
      .attr("d", path);
});