D3 Examples - moving circle

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/d3-selection-multi.v1.min.js"></script>
  <script src="https://unpkg.com/vue"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
        var app = new Vue({
      el: '#vue',
      data: {
        texto: "Carneiro",
        numero: 9
      }
    })
      
    app.texto = "Otavio";    
    
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
      .attr("class", "vue");
    
    svg.append("text")
       .text("A")
       .attr("x", 80)
       .attr("y",300)
         .attr("font-family", "monospace")
       .attr("font-size", 40);
    
    svg.append("text")
       .text("B")
       .attr("x", 400)
       .attr("y",300)
         .attr("font-family", "monospace")
       .attr("font-size", 40);
    
​
    var bola = svg.append("circle")
        .attrs({  // provided by selection-multi module
          "r": 15,
          "cx": 100,
          "cy": 200
          })
        .style("fill", "gray")
        .style("stroke", "black");
    
    bola.transition().attr("cx", 400).duration(2000);
​
  </script>
</body>
​
    