index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
</head>
<style>
.viz-bar .bar{
fill: steelblue;
}
</style>
<body>
<svg width="960" height="500">
<g transform="translate(50,50)"></g>
</svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="//vizjs.org/viz.v1.3.0.min.js"></script>
<script>
var data=[{key:2, v0:0, v1:10},{key:3, v0:-4, v1:0},{key:5, v0:0, v1:6},{key:8, v0:0, v1:1},{key:9, v0:-8, v1:0}];
d3.select("g")
.call(viz.bar().data(data).value0(d=>d.v0).value1(d=>d.v1));
d3.select(".viz-bar")
.selectAll(".bar")
.style("fill",function(d){ return d.data.v0 >= 0 ? "steelblue" : "maroon";})
</script>