javascript实现字符串反转

< html >

< head >
< script  language ="javascript" >
     function  reverse()
    {
         var  str = document.getElementById( " input " ).value;
         var  a = str.split( '' );
         var  result = new  Array();
         while (a.length)
        {
            result.push(a.pop());
        }
        document.getElementById( " result " ).innerHTML = result.join( '' );
    }
</ script >


< title > javascript </ title >

</ head >

< body >
     < table >
     < tr >
     < td >< input  type ="textfield"  id ="input" /> = &gt; </ td >
     < td >< div  id ="result" ></ div ></ td >
     </ tr >
     </ table >
     < input  type ="button"  value ="reverse"  onclick ="reverse()" />
</ body >

</ html >