Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var arr1, funcA, funcB, execute;
    arr1 = [];
    
    for (x = 0; x < 50; x += 1) {
      arr1.push(x.toString());
    }
    
    funcA = function(array, item) {
      for (var i = 0, len = array.length; i < len; i++)
      if (array[i] === item) return i;
      return -1;
    };
    
    funcB = function(array, item) {
      var t = Object(array);
      var len = t.length >>> 0;
      for (var i = 0; i < len; i++)
      if (i in t && t[i] === item) return i;
      return -1
    };
    
    execute = function(fn) {
      fn(arr1, '0');
      fn(arr1, '49');
    };
  };
</script>

Test runner

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execute(funcA);

execute(funcB);

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