let xAxisValue = 'date';

在第1行中使代码笔示例正常工作.

in line 1 to make the codepen sample working.

然后

let x = d3.scaleBand()
.domain(dataToStack.map(function(d){
    let link = d[xAxisValue];                         
    return link;
    //return d.date;
}))
.rangeRound([0,width])
.padding(0.05);

当我在您的Codepen示例中对其进行修改时，它就可以工作.

It works when I modify it in your codepen sample.