<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Math </title><script type="text/javascript">?var rannum = Math.random();document.write("獲取到的隨機數(shù)為："+rannum);document.write("四舍五入后的數(shù)字為:"+Math.round((rannum)*10))</script></head><body></body></html>
求解答，我這里定義的var rannum為什么不會固定呢？每次都在自己變化，怎么讓他保存第一次計算的值呢？
uwenhao2008
2015-12-24 14:00:35
