JavaScript小问题

Question

<input name="pre" type="button" id="pre" value="Pre" onclick="goPrepage()" />
<input name="next" type="button" id="next" value="Next" onclick="goNextpage()" />
<script language="javascript">
function goPrepage()
{
    pageIndex=Number(pageIndex)-1;
    document.cookie="pageIndex="+pageIndex;
}
function goNextpage()
{
    pageIndex=Number(pageIndex)+1;
    document.cookie="pageIndex="+pageIndex;
}
</script>
就是把转成数字相加

Answer 1

哦，原来是这样，初学JavaScript，多谢指点

Answer 2

<input name="pre" type="button" id="pre" value="Pre" onclick="goPrepage()" />
<input name="next" type="button" id="next" value="Next" onclick="goNextpage()" />
<script language="javascript">
function goPrepage()
{pageIndex=2
    pageIndex=pageIndex-1;
    document.cookie="pageIndex="+pageIndex;
alert(pageIndex)
}
function goNextpage()
{
pageIndex=2
    pageIndex=pageIndex+1;
    document.cookie="pageIndex="+pageIndex;
alert(pageIndex)
}
</script>这样？

Answer 3

上面的可能有点bug 修改函数
<input name="pre" type="button" id="pre" value="Pre" onclick="goPrepage()" /> 
<input name="next" type="button" id="next" value="Next" onclick="goNextpage()" /> 
<script language="javascript"> 
function goPrepage() 
{ 
    pageIndex=parseInt(pageIndex)-1; 
    document.cookie="pageIndex="+pageIndex; 
} 
function goNextpage() 
{ 
    pageIndex=parseInt(pageIndex)+1; 
    document.cookie="pageIndex="+pageIndex; 
} 
</script>