来自http://tunps.com/javascript-random-number-generation
var diceThrow=Math.round(Math.random()*5)+1;document.write("You threw a " + diceThrow); |
需要注意的是
0=< random() <1
round()四舍五入，比如round(1.4)=1 ,round(1.5)=2
ceil()总是向上取近似值，比如ceil(0.00000000001)=1
floor()总是向上取近似值，比如floor(0.9999999999999)=0
