在获取折线图上的JSON数据时遇到问题,我可以完全以条形图的方式进行此操作,但是由于某种原因,在制作折线图时会出现错误。周围没有太多文档,所以看看是否有人知道。

我得到这个错误


  
    错误:解析d =“ MNaN,400LNaN,258.65447419986936LNaN,221.90289571086436LNaN,183.32244720226433LNaN,134.29131286740693LNaN,149.70607446113652LNaN,63.1395602003048LNaN,37.448290910422L69NNaN,69。
  


JSON数据如下:


  
    [{“ logins”:“ 3333”,“ month_name”:“一月”},{“ logins”:“ 4956”,“ month_name”:“二月”},{“ logins”:“ 5378”,“ month_name”: “ March”},{“ logins”:“ 5821”,“ month_name”:“ April”},{“ logins”:“ 6384”,“ month_name”:“ May”},{“ logins”:“ 6207”, “ month_name”:“六月”},{“ logins”:“ 7201”,“ month_name”:“ July”},{“ logins”:“ 7496”,“ month_name”:“ August”},{“ logins”: “ 7129”,“ month_name”:“ 9月”},{“ logins”:“ 7926”,“ month_name”:“ 10月”},{“ logins”:“ 5975”,“ month_name”:“ 11月”},{ “ logins”:“ 540”,“ month_name”:“ December”}]
  


现在的代码:


  var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = $("svg").parent().width();
    height = $("svg").parent().height();
    aspect = 500 / 950;



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.month_name); })
    .y(function(d) { return y(d.logins); });

var svg = d3.select(document.createElement("div")).append("svg")

    .attr("preserveAspectRatio", "xMidYMid")
    .attr("viewBox", "0 0 950 500")
    .attr("width", width)
    .attr("height", width * aspect)
    .attr("id", "art_chart")
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    x.domain(d3.extent(data, function(d) { return d.month_name; }));
    y.domain(d3.extent(data, function(d) { return d.logins; }));
         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("Logins");

  svg.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line);


有人知道如何解决它,以便显示折线图吗?

最佳答案

您需要解析日期并将数字作为数字传递:

data.forEach(function(d) {
  d.month_name = d3.time.format("%B").parse(d.month_name);
  d.logins = +d.logins;
});


如果您是在加载JSON之后立即运行此代码的,那么一切都会正常运行。

07-23 01:26