//得到随机数function fRandomBy(under, over){ switch(arguments.length){ case 1: return parseInt(Math.random()*under+1); case 2: return parseInt(Math.random()*(over-under+1) + under); default: return 0; } }//随机得到滚动图片加载样式function getScollStyle() {var array = ["cube","cubeRandom"];var t = array[fRandomBy(0, 1)];return t;}