가려진 이름은 무엇일까요?

1function acceptParams (str) {
2  var length = str.length;
3  var  = str.indexOf(';');
4  var index =  === -1 ? length : ;
5  var ret = { value: str.slice(0, index).trim(), quality: 1, params: {} };
6  
7  while (index < length) {
8    var splitIndex = str.indexOf('=', index);
9    if (splitIndex === -1) break;
10    
11    var  = str.indexOf(';', index);
12    var endIndex =  === -1 ? length : ;
13    
14    if (splitIndex > endIndex) {
15      index = str.lastIndexOf(';', splitIndex - 1) + 1;
16      continue;
17    }
18    
19    var key = str.slice(index, splitIndex).trim();
20    var value = str.slice(splitIndex + 1, endIndex).trim();
21    
22    if (key === 'q') {
23      ret.quality = parseFloat(value);
24    } else {
25      ret.params[key] = value;
26    }
27    
28    index = endIndex + 1;
29  }
30  
31  return ret;
32}