Javascript 如何在nvd3.js中配置图例

我已经使用使用d3.js的库示例构建了某种堆栈图：nvd3.js。 我想控制当前图形的图例位置。但我不能改变图例的位置或顺序，正如我目前看到的那样。 我可以配置当前图形的图例吗？如果可以，我如何访问当前图形图例的配置对象

var数据=[
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{
“密钥”：“甲烷”，
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