求救!一个很简单的问题.我要崩溃了.

Question

<script   language   =   "JavaScript"> 
          for   (i=0;i   <   10;   i++) 
                { 
                        if   (i> 4   &&   i   <   6)
                        {   
                                alert(i); 
                        }                 
                } 
                
 </script> 

Answer 1

if(i>4&&i<6); 后面多了个分号，也就是做完判断后什么都不做～～跟后面输出i不是连在一起的。

Answer 2

 if   (i> 4   &&   i   <   6); 
分号去丢.

Answer 3

谢谢.你帮我改一下这个好吗?我改不了.
<script language = "JavaScript">
function changelocation(locationid)
{
var locationid1=parseInt(locationid)*100;
var locationid2=(parseInt(locationid)+1)*100;
var i;
    for (i=0;i < onecount; i++)
        {
            if (parseInt(subcat[i][0])>parseInt(locationid1) && parseInt(subcat[i][0]) <  parseInt(locationid2));
            { 
                document.postart.city_two.options[document.postart.city_two.length] = new Option(subcat[i][1], subcat[i][0]);
            }        
        }
        
    }</script>

Answer 4

<script   language   =   "JavaScript"> 
function   changelocation(locationid) 
{ 
var   locationid1=parseInt(locationid)*100; 
var   locationid2=(parseInt(locationid)+1)*100; 
var   i; 
        for   (i=0;i   <   onecount;   i++) 
                { 
                        if   (parseInt(subcat[i][0])> parseInt(locationid1)   &&   parseInt(subcat[i][0])   <     parseInt(locationid2))
                        {   
                                document.postart.city_two.options[document.postart.city_two.length]   =   new   Option(subcat[i][1],   subcat[i][0]); 
                        }                 
                } 
                
        } </script> 昏倒....
说了分号去掉了...
if(parseInt(subcat[i][0])> parseInt(locationid1)&&parseInt(subcat[i][0])<parseInt(locationid2));
改为
if(parseInt(subcat[i][0])>parseInt(locationid1)&&parseInt(subcat[i][0])<parseInt(locationid2))