代码片段： const PHI = (1 Math.sqrt(5)) / 2, // 1.618033988749895   maxGeneration = (navigator.userAgent.toLowerCase().indexOf('firefox') > -1) ? 5 : 6,   frameDuration = 1000 / 60,   duration = 3000,   rotationSpeed = 0.3,   totalIterations = Math.floor(duration / frameDuration),   maxBase