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我正在使用 D3 创建多折线图。我已经编写了代码，但没有显示两行，而是只有一行，我无法找出这个问题的原因。

var margin = { 
    top: 20, 
    right: 30, 
    bottom: 30, 
    left: 40 
  }, 
  width = 960 - margin.left - margin.right, 
  height = 500 - margin.top - margin.bottom; 
 
var z = d3.scale.category20c(); 
 
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 parseDate = d3.time.format("%Y-%m-%dT%H:%M:%S.%LZ"); 
 
var data = [{ 
  data: [ 
    ["2016-01-20T05:31:17.000Z", 95.9, {}], 
    ["2016-01-20T05:31:47.000Z", 95.9, {}], 
    ["2016-01-20T05:32:17.000Z", 95.4, {}], 
    ["2016-01-20T05:32:47.000Z", 96.1, {}], 
    ["2016-01-20T05:33:17.000Z", 95.7, {}], 
    ["2016-01-20T05:33:47.000Z", 95.9, {}], 
    ["2016-01-20T05:34:17.000Z", 95.5, {}], 
    ["2016-01-20T05:34:47.000Z", 95.9, {}], 
    ["2016-01-20T05:35:17.000Z", 95.8, {}], 
    ["2016-01-20T05:35:47.000Z", 95.9, {}], 
    ["2016-01-20T05:36:17.000Z", 95.7, {}], 
    ["2016-01-20T05:36:47.000Z", 95.7, {}], 
    ["2016-01-20T05:37:17.000Z", 95.9, {}], 
    ["2016-01-20T05:37:47.000Z", 95.5, {}], 
    ["2016-01-20T05:38:17.000Z", 95.4, {}], 
    ["2016-01-20T05:38:47.000Z", 95.8, {}], 
    ["2016-01-20T05:39:17.000Z", 96.0, {}], 
    ["2016-01-20T05:39:47.000Z", 96.1, {}], 
    ["2016-01-20T05:40:17.000Z", 95.8, {}], 
    ["2016-01-20T05:40:47.000Z", 96.0, {}], 
    ["2016-01-20T05:41:17.000Z", 95.9, {}], 
    ["2016-01-20T05:41:47.000Z", 94.9, {}], 
    ["2016-01-20T05:42:17.000Z", 95.8, {}], 
    ["2016-01-20T05:42:47.000Z", 95.9, {}], 
    ["2016-01-20T05:43:17.000Z", 95.8, {}], 
    ["2016-01-20T05:43:47.000Z", 96.0, {}], 
    ["2016-01-20T05:44:17.000Z", 95.7, {}], 
    ["2016-01-20T05:44:47.000Z", 96.0, {}], 
    ["2016-01-20T05:45:17.000Z", 95.9, {}], 
    ["2016-01-20T05:45:47.000Z", 96.0, {}], 
    ["2016-01-20T05:46:17.000Z", 95.8, {}], 
    ["2016-01-20T05:46:47.000Z", 96.0, {}], 
    ["2016-01-20T05:47:17.000Z", 95.7, {}], 
    ["2016-01-20T05:47:47.000Z", 96.2, {}], 
    ["2016-01-20T05:48:17.000Z", 95.8, {}], 
    ["2016-01-20T05:48:47.000Z", 95.9, {}], 
    ["2016-01-20T05:49:17.000Z", 95.7, {}], 
    ["2016-01-20T05:49:47.000Z", 95.9, {}], 
    ["2016-01-20T05:50:18.000Z", 95.7, {}], 
    ["2016-01-20T05:50:48.000Z", 95.8, {}], 
    ["2016-01-20T05:51:18.000Z", 95.7, {}], 
    ["2016-01-20T05:51:48.000Z", 95.9, {}], 
    ["2016-01-20T05:52:18.000Z", 95.5, {}], 
    ["2016-01-20T05:52:48.000Z", 95.9, {}], 
    ["2016-01-20T05:53:18.000Z", 95.8, {}], 
    ["2016-01-20T05:53:48.000Z", 95.9, {}], 
    ["2016-01-20T05:54:18.000Z", 95.7, {}], 
    ["2016-01-20T05:54:48.000Z", 95.9, {}], 
    ["2016-01-20T05:55:18.000Z", 95.8, {}], 
    ["2016-01-20T05:55:48.000Z", 95.8, {}], 
    ["2016-01-20T05:56:18.000Z", 95.6, {}], 
    ["2016-01-20T05:56:48.000Z", 95.7, {}], 
    ["2016-01-20T05:57:18.000Z", 95.7, {}], 
    ["2016-01-20T05:57:48.000Z", 95.8, {}], 
    ["2016-01-20T05:58:18.000Z", 95.7, {}], 
    ["2016-01-20T05:58:48.000Z", 95.7, {}], 
    ["2016-01-20T05:59:18.000Z", 95.6, {}], 
    ["2016-01-20T05:59:48.000Z", 95.8, {}], 
    ["2016-01-20T06:00:18.000Z", 95.7, {}], 
    ["2016-01-20T06:00:48.000Z", 95.7, {}], 
    ["2016-01-20T06:01:18.000Z", 95.6, {}], 
    ["2016-01-20T06:01:48.000Z", 95.7, {}], 
    ["2016-01-20T06:02:18.000Z", 95.8, {}], 
    ["2016-01-20T06:02:48.000Z", 95.8, {}], 
    ["2016-01-20T06:03:18.000Z", 95.8, {}], 
    ["2016-01-20T06:03:48.000Z", 95.8, {}], 
    ["2016-01-20T06:04:18.000Z", 95.8, {}], 
    ["2016-01-20T06:04:48.000Z", 95.8, {}], 
    ["2016-01-20T06:05:18.000Z", 95.7, {}], 
    ["2016-01-20T06:05:48.000Z", 95.7, {}] 
  ], 
  label: "a" 
}, { 
  data: [ 
    ["2016-01-20T05:31:17.000Z", 95.9, {}], 
    ["2016-01-20T05:31:47.000Z", 95.9, {}], 
    ["2016-01-20T05:32:17.000Z", 95.4, {}], 
    ["2016-01-20T05:32:47.000Z", 96.1, {}], 
    ["2016-01-20T05:33:17.000Z", 95.7, {}], 
    ["2016-01-20T05:33:47.000Z", 95.9, {}], 
    ["2016-01-20T05:34:17.000Z", 95.5, {}], 
    ["2016-01-20T05:34:47.000Z", 95.9, {}], 
    ["2016-01-20T05:35:17.000Z", 95.8, {}], 
    ["2016-01-20T05:35:47.000Z", 95.9, {}], 
    ["2016-01-20T05:36:17.000Z", 95.7, {}], 
    ["2016-01-20T05:36:47.000Z", 95.7, {}], 
    ["2016-01-20T05:37:17.000Z", 95.9, {}], 
    ["2016-01-20T05:37:47.000Z", 95.5, {}], 
    ["2016-01-20T05:38:17.000Z", 95.4, {}], 
    ["2016-01-20T05:38:47.000Z", 95.8, {}], 
    ["2016-01-20T05:39:17.000Z", 96.0, {}], 
    ["2016-01-20T05:39:47.000Z", 96.1, {}], 
    ["2016-01-20T05:40:17.000Z", 95.8, {}], 
    ["2016-01-20T05:40:47.000Z", 96.0, {}], 
    ["2016-01-20T05:41:17.000Z", 95.9, {}], 
    ["2016-01-20T05:41:47.000Z", 94.9, {}], 
    ["2016-01-20T05:42:17.000Z", 95.8, {}], 
    ["2016-01-20T05:42:47.000Z", 95.9, {}], 
    ["2016-01-20T05:43:17.000Z", 95.8, {}], 
    ["2016-01-20T05:43:47.000Z", 96.0, {}], 
    ["2016-01-20T05:44:17.000Z", 95.7, {}], 
    ["2016-01-20T05:44:47.000Z", 96.0, {}], 
    ["2016-01-20T05:45:17.000Z", 95.9, {}], 
    ["2016-01-20T05:45:47.000Z", 96.0, {}], 
    ["2016-01-20T05:46:17.000Z", 95.8, {}], 
    ["2016-01-20T05:46:47.000Z", 96.0, {}], 
    ["2016-01-20T05:47:17.000Z", 95.7, {}], 
    ["2016-01-20T05:47:47.000Z", 96.2, {}], 
    ["2016-01-20T05:48:17.000Z", 95.8, {}], 
    ["2016-01-20T05:48:47.000Z", 95.9, {}], 
    ["2016-01-20T05:49:17.000Z", 95.7, {}], 
    ["2016-01-20T05:49:47.000Z", 95.9, {}], 
    ["2016-01-20T05:50:18.000Z", 95.7, {}], 
    ["2016-01-20T05:50:48.000Z", 95.8, {}], 
    ["2016-01-20T05:51:18.000Z", 95.7, {}], 
    ["2016-01-20T05:51:48.000Z", 95.9, {}], 
    ["2016-01-20T05:52:18.000Z", 95.5, {}], 
    ["2016-01-20T05:52:48.000Z", 95.9, {}], 
    ["2016-01-20T05:53:18.000Z", 95.8, {}], 
    ["2016-01-20T05:53:48.000Z", 95.9, {}], 
    ["2016-01-20T05:54:18.000Z", 95.7, {}], 
    ["2016-01-20T05:54:48.000Z", 95.9, {}], 
    ["2016-01-20T05:55:18.000Z", 95.8, {}], 
    ["2016-01-20T05:55:48.000Z", 95.8, {}], 
    ["2016-01-20T05:56:18.000Z", 95.6, {}], 
    ["2016-01-20T05:56:48.000Z", 95.7, {}], 
    ["2016-01-20T05:57:18.000Z", 95.7, {}], 
    ["2016-01-20T05:57:48.000Z", 95.8, {}], 
    ["2016-01-20T05:58:18.000Z", 95.7, {}], 
    ["2016-01-20T05:58:48.000Z", 95.7, {}], 
    ["2016-01-20T05:59:18.000Z", 95.6, {}], 
    ["2016-01-20T05:59:48.000Z", 95.8, {}], 
    ["2016-01-20T06:00:18.000Z", 95.7, {}], 
    ["2016-01-20T06:00:48.000Z", 95.7, {}], 
    ["2016-01-20T06:01:18.000Z", 95.6, {}], 
    ["2016-01-20T06:01:48.000Z", 95.7, {}], 
    ["2016-01-20T06:02:18.000Z", 95.8, {}], 
    ["2016-01-20T06:02:48.000Z", 95.8, {}], 
    ["2016-01-20T06:03:18.000Z", 95.8, {}], 
    ["2016-01-20T06:03:48.000Z", 95.8, {}], 
    ["2016-01-20T06:04:18.000Z", 95.8, {}], 
    ["2016-01-20T06:04:48.000Z", 95.8, {}], 
    ["2016-01-20T06:05:18.000Z", 95.7, {}], 
    ["2016-01-20T06:05:48.000Z", 95.7, {}] 
  ], 
  label: "b" 
}] 
 
 
var x = d3.time.scale() 
  .range([0, width]); 
 
var y = d3.scale.linear() 
  .range([height, 0]); 
 
var xAxis = d3.svg.axis() 
  .scale(x) 
  .orient("bottom"); 
 
var yAxis = d3.svg.axis() 
  .scale(y) 
  .orient("left"); 
 
var line = d3.svg.line() 
  .interpolate("monotone") 
  .x(function(d) { 
    return x(parseDate.parse(d[0])); 
  }) 
  .y(function(d) { 
    return y(d[1]); 
  }); 
 
var ary = []; 
data.forEach(function(d) { 
  ary.push(d.data); 
}); 
 
x.domain(d3.extent(d3.merge(ary), function(d) { 
  return parseDate.parse(d[0]); 
})); 
 
y.domain([ 
  d3.min(data, function(c) { 
    return d3.min(c.data, function(v) { 
      return v[1]; 
    }); 
  }), 
  d3.max(data, function(c) { 
    return d3.max(c.data, function(v) { 
      return v[1]; 
    }); 
  }) 
]); 
 
svg.append("g") 
  .attr("class", "x axis") 
  .attr("transform", "translate(0," + height + ")") 
  .call(xAxis); 
 
svg.append("g") 
  .attr("class", "y axis") 
  .call(yAxis); 
 
var series = svg.selectAll(".series") 
  .data(data) 
  .enter().append("g") 
  .attr("class", "series"); 
 
series.append("path") 
  .attr("class", "line") 
  .attr("d", function(d) { 
    return line(d.data); 
  }) 
  .style("stroke", function(d, i) { 
    return z(i); 
  });
text.inner-circle { 
  font-weight: 400; 
  font-size: 12px; 
  text-transform: uppercase; 
} 
text.inner-text { 
  font-weight: 400; 
  font-size: 36px; 
  font-family: 'Metric Regular', 'Metric'; 
  text-align: center; 
  font-style: normal; 
  text-transform: uppercase; 
} 
path { 
  stroke: steelblue; 
  stroke-width: 2; 
  fill: none; 
} 
.axis path, 
.axis line { 
  fill: none; 
  stroke: grey; 
  stroke-width: 2; 
  shape-rendering: crispEdges; 
} 
.grid .tick { 
  stroke: lightgrey; 
  stroke-opacity: 0.7; 
  shape-rendering: crispEdges; 
} 
.grid path { 
  stroke-width: 0; 
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

请帮助我找出我做错了什么。

Code

请您参考如下方法:

你只是错过了一个“返回”

x.domain(d3.extent(d3.merge(ary), function(d) { 
  parseDate.parse(d[0]); 
}));

应该是

x.domain(d3.extent(d3.merge(ary), function(d) { 
  return parseDate.parse(d[0]); 
}));


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