用回车代替TAB

<script language=javascript>
function next()
{
var src = event.srcElement
if (event.keyCode != 13) return
if (!(src.type == "text" || src.type == "textarea" || src.type == "password" || src.type == "file" || src.type.indexOf("select") != -1)) return null
var i
if (!src.form) return
for (i=0; i<src.form.elements.length; i++)
if(src.form.elements[i] == src) break
if (src.form.elements[++i])
src.form.elements[i].focus()
event.returnValue = false
}
</script>

<form onkeydown=next()>
<input><br>
<a href="#">test</a><br>
<input type=password><br>
<textarea></textarea>
<select></select>
<input type=submit>
<input type=reset>
</form>