!--NEWSZW_HZH_BEGIN--
Math.random():获得0~1随机数
Math.floor() method rounds a number DOWNWARDS to the nearest integer, and returns the result. (小于等于 x,且与 x 最接近的整数。)Math.
!--NEWSZW_HZH_BEGIN--
Math.random():获得0~1随机数
Math.floor() method rounds a number DOWNWARDS to the nearest integer, and returns the result. (小于等于 x,且与 x 最接近的整数。)Math.