很奇怪的前端游戏小问题
//问题在于,每次隐藏的都是第九头牛。如果你想帮我调试一下的话麻烦你照一张小图片,名字改成cow.jpg,这样就可以了。
[code=HTML][/code]<!DOCTYPE HTML>
<html>
<head>
<meta charset="gb2312"/>
<script src="jquery-1.7.2.js"></script>
<style>
  div#frame{
   margin:100px auto;
   border:2px solid skyblue;
   width:300px;
   height:300px;
   padding:10px;
  }
  div#one div,div#two div ,div#thr div{
   float:left;
   margin:10px;
   display:block;
  }
  input#begin{
   margin:50px auto;
  }
  span{
   margin:0 auto;
   font-size:12px;
  }
</style>
</head>
<body>
   <div id="frame">
    <div id="one">
     <div  id="a"><img src="cow.png"/></div>
	<div  id="b"><img src="cow.png"/></div>
	<div  id="c"><img src="cow.png"/></div>
    </div>
    <div id="two">
     <div  id="d"><img src="cow.png"/></div>
	<div  id="e"><img src="cow.png"/></div>
	<div  id="f"><img src="cow.png"/></div>
    </div>
    <div id="thr">
     <div  id="g"><img src="cow.png"/></div>
	<div  id="h"><img src="cow.png"/></div>
	<div  id="i"><img src="cow.png"/></div>
    </div>
   </div>
   <span></span>
   <input type="button" value="游戏开始" id="begin"/>
   <script>
	function getRandom(){ //此方法用于产生1-9的随机数
	  return  Math.floor(Math.random()*9+1);
	}
	function hide(r){//根据产生的随机数,隐藏一头牛,r就是传进来的随机数
	  if(r==1)
	  {
	   $("div#a").css("display","none");setTimeout(function(){$("div#a").css("display","block");},1000);//隐藏第一头牛,一秒钟以后恢复,一下相同
	  }
	  else if(r==2)
	  {
	   $("div#b").css("display","none");setTimeout(function(){$("div#b").css("display","block");},1000);
	  }
	  else if(r==3)
	  {
	   $("div#c").css("display","none");setTimeout(function(){$("div#c").css("display","block");},1000);
	  }
	  else if(r==4)
	  {
	   $("div#d").css("display","none");setTimeout(function(){$("div#d").css("display","block");},1000);
	  }
	  else if(r==5)
	  {
	   $("div#e").css("display","none");setTimeout(function(){$("div#e").css("display","block");},1000);
	  }
	  else if(r==6)
	  {
	   $("div#f").css("display","none");setTimeout(function(){$("div#f").css("display","block");},1000);
	  }
	  else if(r==7)
	  {
	   $("div#g").css("display","none");setTimeout(function(){$("div#g").css("display","block");},1000);
	  }
	  else if(r==8)
	  {
	   $("div#h").css("display","none");setTimeout(function(){$("div#h").css("display","block");},1000);
	  }
	  else if(r==9)
	  {
	   $("div#i").css("displa