如何在nvd3多条形图上显示数据标签？

Question

我尝试了一些在线发现的不同方法。例如，下面的那个和＆＃34; showValues＆＃34;。但是，这些都不起作用。有人可以提供一个如何正确执行此操作的示例吗？

d3.selectAll('.nv-multibar .nv-group').each(function(group){
  var g = d3.select(this);

  // Remove previous labels if there is any
  g.selectAll('text').remove();
  g.selectAll('.nv-bar').each(function(bar){
    var b = d3.select(this);
    var barWidth = b.attr('width');
    var barHeight = b.attr('height');

    g.append('text')
      // Transforms shift the origin point then the x and y of the bar
      // is altered by this transform. In order to align the labels
      // we need to apply this transform to those.
      .attr('transform', b.attr('transform'))
      .text(function(){
        // Two decimals format
        return parseFloat(bar.y).toFixed(2);
      })
      .attr('y', function(){
        // Center label vertically
        var height = this.getBBox().height;
        return parseFloat(b.attr('y')) - 10; // 10 is the label's magin from the bar
      })
      .attr('x', function(){
        // Center label horizontally
        var width = this.getBBox().width;
        return parseFloat(b.attr('x')) + (parseFloat(barWidth) / 2) - (width / 2);
      })
         .attr('class', 'bar-values');
      });
    });