所以我试图为我的折线图（下面的代码）创建一条路径。数据存储在 JSON 对象中，数据点只是一个点数组（日期和值）。数据已全部解析，因此格式正确，但是当我将路径附加到 svg（最后几行代码）并尝试使用 .datum 输入数据时，javascript 控制台显示“错误：解析问题: 并表明 d="MNaN,NaNLNaN,NaNLNaN,NaNLNaN,NaNLNaN,NaNLNaN,NaNLNaN,NaNLNaN,NaNLNaN,..."。我不知道这个 NaNLNaN 是从哪里来的。
<script>
var margin = {top: 20, right: 20, bottom: 30, left: 50},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var parseDate = d3.time.format("%x").parse;
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()
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.close); });
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 datastring = "{ \"title\":\"Stock Price of Apple (AAPL)\", \"x\":{ \"label\":\"Date\", \"unit\":\"Day\" }, \"y\":{ \"label\":\"Price\", \"unit\":\"$\" }, \"points\":[ [ \"3/13/13\", \"428.45\" ], [ \"3/12/13\", \"435.6\" ], [ \"3/11/13\", \"429.75\" ], [ \"3/8/13\", \"429.8\" ], [ \"3/7/13\", \"424.5\" ], [ \"3/6/13\", \"434.51\" ], [ \"3/5/13\", \"421.48\" ], [ \"3/4/13\", \"427.8\" ], [ \"3/1/13\", \"438\" ], [ \"2/28/13\", \"444.05\" ], [ \"2/27/13\", \"448.43\" ], [ \"2/26/13\", \"443.82\" ], [ \"2/25/13\", \"453.85\" ], [ \"2/22/13\", \"449.25\" ], [ \"2/21/13\", \"446\" ], [ \"2/20/13\", \"457.69\" ], [ \"2/19/13\", \"461.1\" ], [ \"2/15/13\", \"468.85\" ], [ \"2/14/13\", \"464.52\" ], [ \"2/13/13\", \"467.21\" ], [ \"2/12/13\", \"479.51\" ], [ \"2/11/13\", \"476.5\" ], [ \"2/8/13\", \"474\" ], [ \"2/7/13\", \"463.25\" ], [ \"2/6/13\", \"456.47\" ], [ \"2/5/13\", \"444.05\" ], [ \"2/4/13\", \"453.91\" ], [ \"2/1/13\", \"459.11\" ], [ \"1/31/13\", \"456.98\" ], [ \"1/30/13\", 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var data = JSON.parse(datastring);
var points = data["points"];
points.forEach(function(d) {
d[0] = parseDate(d[0]);
d[1] = +d[1];
});
points.reverse();
x.domain(d3.extent(points, function(d) { return d[0]; }));
y.domain(d3.extent(points, function(d) { return d[1]; }));
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Price ($)");
svg.append("path")
.datum(points)
.attr("class", "line")
.attr("d", line);
</script>