title: d3.js ／ without using the call method, you can view the x-axis?
body: <p><strong>Current code</strong>
  / Call method used</p>
  
  <pre><code>var svg = d3.select("#hoge").append("svg")
      .attr("width", 600).attr("height", 400)
  var xScale = d3.scale.linear()
      .domain([0, 100])
      .range([0, 400]);
  svg.append("g")
      .attr("class", "axis")
      .call(d3.svg.axis()
          .scale(xScale)
      );
  </code></pre>
  
  <hr>
  
  <p><strong>I want to know</strong>
  / Call method unused</p>
  
  <pre><code>var svg = d3.select("#hoge").append("svg")
      .attr("width", 600).attr("height", 400)
  var xScale = d3.scale.linear()
      .domain([0, 100])
      .range([0, 400]);
  svg.append("g")
      .attr("class", "axis");
  
  d3.svg.axis(svg).scale(xScale);
  </code></pre>
  
  <hr>
  
  <p>If you do not use the call method
  The x-axis can not be displayed?</p>