index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
</head>
<style>
.viz-line .line{
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
</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, value:10},{key:3, value:4},{key:5, value:6},{key:8, value:1}];
var line = viz.line()
.data(data)
var lineg = d3.select("g").call(line);
setInterval(function(){
line.data(data.map(function(d){ return {key:d.key, value:Math.random()*10};}))
.valueScale(undefined)
lineg.call(line);
}, 2000);
</script>