无法使浏览器正确读取数据以进行数据可视化

Question

我正在d3中构建折线图，但无法填充折线。当我console.log我的数据时，我得到以下信息：

我应该只有一个“事件”列，而不是两个。一个正在正确读取它，另一个给我每行不正确的NaN。我相信这是我问题的根源。

这是我的代码：

    <label class="guideline">
  Show Guideline & Curtain
  <input type="checkbox" id="show_guideline" />
</label>

<svg></svg>

body {
  font: 10px sans-serif;
  margin: 0;
}

path.line {
  fill: none;
  stroke: #666;
  stroke-width: 1.5px;
}

path.area {
  fill: #e7e7e7;
}

.axis {
  shape-rendering: crispEdges;
}

.x.axis line {
  stroke: #fff;
}

.x.axis .minor {
  stroke-opacity: .5;
}

.x.axis path {
  display: none;
}

.y.axis line, .y.axis path {
  fill: none;
  stroke: #000;
}
.guideline {
  margin-right: 100px;
  float: right;
}


var margin = {top: 80, right: 80, bottom: 80, left: 80},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

//var parse = d3.time.format("%b %Y").parse;
var parse = d3.time.format("%Y").parse; 

// Scales and axes. Note the inverted domain for the y-scale: bigger is up!
var x = d3.time.scale().range([0, width]),
    y = d3.scale.linear().range([height, 0]),
    xAxis = d3.svg.axis().scale(x).tickSize(-height).tickSubdivide(true),
    yAxis = d3.svg.axis().scale(y).ticks(4).orient("right");

// An area generator, for the light fill.
var area = d3.svg.area()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y0(height)
    .y1(function(d) { return y(d.incidents); }); 

// A line generator, for the dark stroke.
var line = d3.svg.line()
    .interpolate("monotone")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.incidents); });



var data = d3.csv("static/data/israel/incidents_linechart.csv", type, function(error, data) {
    console.log(data);
   // Filter to one symbol; the S&P 500.
  var israel = data.filter(function(d) {
    return d.country == "Israel";
  });

  var unitedStates = data.filter(function(d) {
    return d.country == "United States";
  });

  var iran = data.filter(function(d) {
    return d.country == "Iran";
  });

  var iraq = data.filter(function(d) {
    return d.country == "Iraq";
  });

x.domain([israel[0].date, israel[israel.length - 1].date]);
  y.domain([0, d3.max(israel, function(d) { return d.incidents; })]).nice();

  // Add an SVG element with the desired dimensions and margin.
  var svg = d3.select("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
      .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")")

  // Add the clip path.
  svg.append("clipPath")
      .attr("id", "clip")
      .append("rect")
      .attr("width", width)
      .attr("height", height);

  // Add the x-axis.
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  // Add the y-axis.
  svg.append("g")
      .attr("class", "y axis")
      .attr("transform", "translate(" + width + ",0)")
      .call(yAxis);


  var colors = d3.scale.category10();

  svg.selectAll('.line')
    .data([israel, unitedStates, iran, iraq, saudiArabia, turkey, egypt, syria, lebanon, jordan, palestine, pakistan, afghanistan]) /// can add however many i want here 
    .enter()
      .append('path')
        .attr('class', 'line')
        .style('stroke', function(d) {
          return colors(Math.random() * 50);
        })
        .attr('clip-path', 'url(#clip)')
        .attr('d', function(d) {
          return line(d);
        })

  /* Add 'curtain' rectangle to hide entire graph */
  var curtain = svg.append('rect')
    .attr('x', -1 * width)
    .attr('y', -1 * height)
    .attr('height', height)
    .attr('width', width)
    .attr('class', 'curtain')
    .attr('transform', 'rotate(180)')
    .style('fill', '#ffffff')

  /* Optionally add a guideline */
  var guideline = svg.append('line')
    .attr('stroke', '#333')
    .attr('stroke-width', 0)
    .attr('class', 'guide')
    .attr('x1', 1)
    .attr('y1', 1)
    .attr('x2', 1)
    .attr('y2', height)

  /* Create a shared transition for anything we're animating */
  var t = svg.transition()
    .delay(750)
    .duration(6000)
    .ease('linear')
    .each('end', function() {
      d3.select('line.guide')
        .transition()
        .style('opacity', 0)
        .remove()
    });

  t.select('rect.curtain')
    .attr('width', 0);
  t.select('line.guide')
    .attr('transform', 'translate(' + width + ', 0)')

  d3.select("#show_guideline").on("change", function(e) {
    guideline.attr('stroke-width', this.checked ? 1 : 0);
    curtain.attr("opacity", this.checked ? 0.75 : 1);
  })

});


// Parse dates and numbers. We assume israel are sorted by date.
function type(d) {
  d.country = d.country;
  //d.date = parse(d.date);
  d.date = d.date;
  d.incidents = +d.incidents
  return d;
}