d3焦点+上下文通过刷涂不显示任何内容

Question

我试图通过使用D3刷新使用Focus + Context来显示一些数据。我对数据有一些问题。我刚刚更改了数据获取代码行，因为我使用d3.json获取2个值。这是我的代码 -

<script type="text/javascript">
    var margin = {top: 10, right: 10, bottom: 100, left: 40},
        margin2 = {top: 430, right: 10, bottom: 20, left: 40},
        width = 960 - margin.left - margin.right,
        height = 500 - margin.top - margin.bottom,
        height2 = 500 - margin2.top - margin2.bottom;

    var parseDate = d3.time.format("%a %e %H %M").parse;

    var x = d3.time.scale().range([0, width]),
        x2 = d3.time.scale().range([0, width]),
        y = d3.scale.linear().range([height, 0]),
        y2 = d3.scale.linear().range([height2, 0]);

    var xAxis = d3.svg.axis().scale(x).orient("bottom"),
        xAxis2 = d3.svg.axis().scale(x2).orient("bottom"),
        yAxis = d3.svg.axis().scale(y).orient("left");

    var brush = d3.svg.brush()
        .x(x2)
        .on("brush", brushed);

    var area = d3.svg.area()
        .interpolate("monotone")
        .x(function(d) { return x(d.receiveddate); })
        .y0(height)
        .y1(function(d) { return y(d.gtse); });

    var area2 = d3.svg.area()
        .interpolate("monotone")
        .x(function(d) { return x2(d.receiveddate); })
        .y0(height2)
        .y1(function(d) { return y2(d.gtse); });

    var svg = d3.select("body").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom);

    svg.append("defs").append("clipPath")
        .attr("id", "clip")
      .append("rect")
        .attr("width", width)
        .attr("height", height);

    var focus = svg.append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    var context = svg.append("g")
        .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");

    d3.json("rest.php/lastweek"+"/"+"dibya", function(error, data) {
          var allData = data.records;
          allData.forEach(function(d) {
            var formattedDate = new Date(+d.receiveddate).toString();
            d.receiveddate = parseDate(d3.time.format("%a %e %H %M")(new Date(formattedDate)));
            d.gtse = +d.gtse;
          });

          x.domain(d3.extent(allData.map(function(d) { return d.receiveddate; })));
          y.domain([0, d3.max(allData.map(function(d) { return d.gtse; }))]);
          x2.domain(x.domain());
          y2.domain(y.domain());

          focus.append("path")
              .datum(data)
              .attr("clip-path", "url(#clip)")
              .attr("d", area);

          focus.append("g")
              .attr("class", "x axis")
              .attr("transform", "translate(0," + height + ")")
              .call(xAxis);

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

          context.append("path")
              .datum(data)
              .attr("d", area2);

          context.append("g")
              .attr("class", "x axis")
              .attr("transform", "translate(0," + height2 + ")")
              .call(xAxis2);

          context.append("g")
              .attr("class", "x brush")
              .call(brush)
            .selectAll("rect")
              .attr("y", -6)
              .attr("height", height2 + 7);
    });

    function brushed() {
      x.domain(brush.empty() ? x2.domain() : brush.extent());
      focus.select("path").attr("d", area);
      focus.select(".x.axis").call(xAxis);
    }

此处将收到的日期作为Millis中的日期提取并相应地进行转换。收到的日期是10分钟的频率。浏览器根据传递的值加载x和y轴，但不绘制图形。我也没有在控制台中出现任何错误。我错过了什么？