在for…in循环中重置迭代器

if(circles.length != 0) { //1+ circles have already been drawn
  x = genX(radius);
  y = genY(radius);
  var i = 0;
  iCantThinkOfAGoodLabelName:
  for(i in circles) {
    var thisCircle = circles[i];
    if(Math.abs(x-thisCircle[\"x\"])+Math.abs(y-thisCircle[\"y\"])>radius*2) {
      //overlaps
    } else {
      //overlaps
      x = genX(radius);
      y = genY(radius);
      continue iCantThinkOfAGoodLabelName;
    }

    if(i == circles.length - 1) { //Last iteration
      //Draw circle, add to array
    }
  }
}

for ... in

for(var i = 0; i < circles.length; ++i)

i = 0

for (var i=0,l = circles.length;i < l; i++) {
   ....  

   if (i === l) {
     // draw
   }
}

for..in