bars of bars

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; 
    background-color: #ccc
    }
    .axis {
	  		font: 10px sans-serif;
			}

.axis path,
			.axis line {
	  		fill: none;
	  		stroke: #000;
	  		shape-rendering: crispEdges;
			}
  </style>
</head>

<body>
  <script>
		var data =[[2011,0.11],[2012,0.44],[2013,-0.34],[2014,.24]]
//     var width = 200
//     var height = 200
    var margin = {top: 20, right: 20, bottom: 64, left: 40}
    var width = 313 - margin.left - margin.right
    var height = 217 - margin.top - margin.bottom
    
    var bar = {height: 10}
    var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform",
          "translate(" + margin.left + "," + margin.top + ")");
    
    var x = d3.scaleBand().rangeRound([0, width], .05).padding(0.4);
    var y = d3.scaleLinear().range([height, 0]);

data.forEach(function(d) {
        d.date = d3.timeParse("%Y")(d[0]);
        d.value = +d[1];
    });
    
  x.domain(data.map(function(d) { return d.date; }));

y.domain(d3.extent(data.map(function(d) { return d.value; })))

var xAxis = d3.axisBottom()
    .scale(x)
    .tickFormat(d3.timeFormat("%Y"))
    
    var yAxis = d3.axisLeft()
    	.scale(y)
    	.ticks(4);
    
     svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)

svg.append("line")
    	.attr("y1",y(0))
    	.attr("y2",y(0))
      .attr("x2",width)
      .style("stroke","grey")
    	.style("stroke-width","0.5")
    
    var bh = 4;
    svg.selectAll("bar")
      .data(data)
    	.enter()
    	.each(function (d, i) {

</script>
</body>

https://d3js.org/d3.v4.min.js