js实现文本框回车切换焦点

一段小脚本

实现功能：文本框回车切换焦点

<script>function foo(){    var items=document.getElementsByName('key[]');    var item=null;for(var i=0;i<items.length;i++){     item=items[i];(function () {   var next=(i+1) < items.length ? i+1 : 0 ; item.onkeydown=function(event){     var eve=event ? event : window.event; if(eve.keyCode==13){       items[next].focus(); } } })();}}window.onload=foo;</script><form action="" name="myform"><Input type=text name='key[]'> <br><Input type=text name='key[]'> <br><Input type=text name='key[]'> </form>