以如下裴波那契数列为测试代码：
function fibonacci(n)
{
if (n < 2) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
}
print('fibonacci(20):' + fibonacci(20));
27 12-09 14:13:04.371 4816 4816 E BirdNest: fibonacci(10):55
29 12-09 14:13:04.371 4816 4816 I faywong : benchmark(v8): 537
31 12-09 14:13:04.391 4816 4816 I BirdNest: fibonacci(10):55
32 12-09 14:13:04.391 4816 4816 I faywong : benchmark(duktape): 2336
当输入为20时的结果：
59 12-09 14:15:38.621 9196 9196 E BirdNest: fibonacci(20):6765
61 12-09 14:15:38.621 9196 9196 I faywong : benchmark(v8): 1583
63 12-09 14:15:38.841 9196 9196 I BirdNest: fibonacci(20):6765
64 12-09 14:15:38.841 9196 9196 I faywong : benchmark(duktape): 189211
大致汇总下：在输入为10时，v8性能是duktape的4倍；
在输入为20时，v8性能是duktape的119倍，jsc是duktape的接近100倍
