请问用JAVASCRIPT怎么判断一个文本框里输入的是百分比的数?

Question

用正则表达式判断:
strRegular="/^(\-)?(0|[1-9](\d)*)(\.(\d)+)?\%$/";
if(strRegular.test(百分数))
{
   alert('是百分数')；
}
else
{
    alert('不是百分数')
}

Answer 1

转成小数
function conv(per)
{
    var ss=per.substring(0,per.length-2);
    return ss/100;
}

Answer 2

<script language=javascript>
function ck(obj)
{
    if (obj.value.substr(obj.value.length-1)=='%' && !isNaN(Number(obj.value.substring(0,obj.value.length-1))))
        alert('是百分数');
    else
        alert('非百分数');
}
</script><form name=form1>
<input type=text name=t1>
<input type=button value="check" onclick="ck(t1);">
</form>

Answer 3

<script language=javascript>
function ck(obj)
{
    var tv;
    if (obj.value.substr(obj.value.length-1)=='%' && !isNaN(tv=Number(obj.value.substring(0,obj.value.length-1))))
        alert('是百分数，实际数字'+ (tv/100));
    else
        alert('非百分数');
}
</script><form name=form1>
<input type=text name=t1>
<input type=button value="check" onclick="ck(t1);">
</form>

Answer 4

<javascript>
function aa(){
var b,c,d,e
d=b+1
e=b-1
c=document.form1.text1.value.lenght
for (b=0;b<=c;b++){
   if (a.substring(b,d)=="%"){
     if ((a.substring(b,d))%2==1){
        if ((a.substring(b,d))%2==0){
          if ((a.substring(e,b))%==1){
               if((a.substring(e,b))%==0){
               document.write("无百分数")
                }
              }
           }
        }
      document.write("有百分数")  
    } 
 }     </javascript>

Answer 5

上面的有误
上面的有误
<javascript>
function aa(){
var a,b,c,d,e
a=document.form1.text1.value
c=a.lenght
for (b=0;b<=c;b++){
d=b+1
e=b-1
  if (a.substring(b,d)=="%"){
    for(d=d;d=c;d++){
     if ((a.substring(b,d))%2==1){
       if(d=c){
              loop 
              }
          for(d=d;d=c;d++){      
             if ((a.substring(b,d))%2==0){
                if(d=c){
                        loop 
                       }
                  for(b=b;b=0;b--){
                     if ((a.substring(e,b))%2==1){
                        if(b=0){
                               loop
                               }  
                           for(b=b;b=0;b--){
                               if ((a.substring(e,b))%2==0){
                                   if(b=0){
                                          loop
                                          }  
                                          }
                                   else{
                                       }
                                   document.write("无百分数")
                                         }
                                    }
                               } 
                           }     
                        }
                   } 
               }
            }
          document.write("有百分数")  
        }   }</javascript>

Answer 6

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