Javascript称球
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一道经典的智力题（12球称三次找出异常一球）
有十二个乒乓球特征相同，其中只有一个重量异常，现在要求用一部没有砝码的天平称三次，将那个重量异常的球找出来。
评分标准：
1、30分钟以内做出来：智力很高很高很高，不知道有多高。
2、60分钟以内做出来：智力很高。
3、两小时内做出来： 智力相当高。
4、1天或者1周内做出来：智力也很高，而且还是一个有毅力的人。
5、10分钟内做出来：你或者以前做过，或者多半是个马虎的人。
这里的问题关键是异常，所以不知道是轻了，还是重了，并且解题最后还要知道这球是轻还是重了。
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var arrSel=["one","two","three","four"];//arrSel定义了要修改的下拉框
var i=0,arrData=[];//arrData中搁的是数据,每条都显示各级的数据
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arrData[i++]=["重","平","重","8球比较轻"]
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arrData[i++]=["重","轻","(1)比(3)","请先做前面的选择"]
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arrData[i++]=["平","平","(1)比(12)","请先做前面的选择"]
arrData[i++]=["平","平","重","12球比较轻"]
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arrData[i++]=["平","平","轻","12球比较重"]
arrData[i++]=["平","轻","(9)比(10)","请先做前面的选择"]
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arrData[i++]=["平","轻","平","11球比较重"]
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arrData[i++]=["轻","重","重","3球比较轻"]
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arrData[i++]=["轻","重","轻","无解"]
arrData[i++]=["轻","平","(7)比(8)","请先做前面的选择"]
arrData[i++]=["轻","平","重","7球比较重"]
arrData[i++]=["轻","平","平","4球比较轻"]
arrData[i++]=["轻","平","轻","8球比较重"]
arrData[i++]=["轻","轻","(1)比(2)","请先做前面的选择"]
arrData[i++]=["轻","轻","重","2球比较轻"]
arrData[i++]=["轻","轻","平","6球比较重"]
arrData[i++]=["轻","轻","轻","1球比较轻"]
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<script>
function qswhInit(num){
/******* by qiushuiwuhen(2002-5-15) ********/
var i,j,arrTemp=[];
for(i=0;i<num;i++)arrTemp[i]=document.all(arrSel[i]).options[document.all(arrSel[i]).selectedIndex].text
if(num==arrSel.length){//这里处理最后的数据。
return;
}
with(document.all(arrSel[num])){
length=0
for(i=0;i<arrData.length;i++){
for(j=0;j<num;j++)if(arrTemp[j]!=arrData[i][j])break;
if(j!=num)continue;
if(length==0||options[length-1].text!=arrData[i][num])
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onchange();
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qswhInit(0);//初始化
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