Random Dots

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    svg { width: 100%; height: 100%; }
  </style>
</head>

<body>
  <svg>
  </svg>
  
  <script>
    var i = 4;
    var width = 500;
    var height = 500;
    
    var svg = d3.select('svg');
    
    for (var i = 0; i < 2587; i++){
      var data = {x : Math.random() * 848,
      				 y : Math.random() * 655,
    					 radius : Math.random() * 10 + 1
    };
    
      svg.append('circle')
    			.datum(data);
    
    } 
    
    
    svg.selectAll('circle')
    		.attr('cx', function(d){
      	return d.x;
    		})
    		.attr('cy', function(d){
      	return d.y;
    		})
    		.attr('r', function(d){
      	return d.radius;
    		});
    
    console.log(d3.selectAll('circle'));
    
    
    /*
      	.attr('cx', x)
      	.attr('cy', y)
      	.attr('r', radius);
    
		*/
  </script>
</body>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js