<div id="friendlink" currentindex=""></div>

 <input type="button" onclick="addlink();" value="添加" />

 <script type="text/javascript">

 function addlink(){

     var x = 1;

     var linkdiv = document.getElementById("friendlink");

     if (linkdiv.attributes.currentindex.value) {

         var tmp = linkdiv.attributes.currentindex.value;

         x = parseInt(tmp) + 1;

     }

     linkdiv.setAttribute('currentindex', x);

     var yname = 'link[js'+x+'][name]';

     var yurl = 'link[js'+x+'][url]';

     var yorder = 'link[js'+x+'][order]';

         var input1 = document.createElement('input');

         input1.setAttribute('type', 'text');

         input1.setAttribute('name', yname);

         var input2 = document.createElement('input');

         input2.setAttribute('type', 'text');

         input2.setAttribute('name', yurl);

         var input3 = document.createElement('input');

         input3.setAttribute('type', 'text');

         input3.setAttribute('name', yorder);

         var br = document.createElement('br');

         linkdiv.insertBefore(input1,null);

         linkdiv.insertBefore(input2,null);

         linkdiv.insertBefore(input3,null);

         linkdiv.insertBefore(br,null);

 }

 </script>