高手请进，小问题（50分）

if(event.keyCode == 40)
{
var id = window.event.srcElement.name
id = id.substr(1,1)
id = parseInt(id) + 1
if(id > 12) id = 1
eval("document.form1.d" + id + ".focus()")
}这里的id怎么也不会大于12啊

解决方案 »

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。<form name="form1" method="post" action="">
  <p> (1)
    <input type="text" name="d1" onkeydown="test(this)">
  </p>
  <p> (2)
    <input type="text" name="d2" onkeydown="test(this)">
  </p>
  <p> (3)
    <input type="text" name="d3" onkeydown="test(this)">
  </p>
  <p> (4)
    <input type="text" name="d4" onkeydown="test(this)">
  </p>
  <p> (5)
    <input type="text" name="d5" onkeydown="test(this)">
<p> (6)
    <input type="text" name="d6" onkeydown="test(this)">
<p> (7)
    <input type="text" name="d7" onkeydown="test(this)">
<p> (8)
    <input type="text" name="d8" onkeydown="test(this)">
<p> (9)
    <input type="text" name="d9" onkeydown="test(this)">
<p> (10)
    <input type="text" name="d10" onkeydown="test(this)"> <p> (11)
    <input type="text" name="d11" onkeydown="test(this)"> <p> (12)
    <input type="text" name="d12" onkeydown="test(this)">
  </p>
</form>
<script>
function test(obj)
{
if(event.keyCode == 38)
{
var id = window.event.srcElement.name
id = id.substr(1)
id = parseInt(id) - 1
if(id < 1) id = 12
eval("document.form1.d" + id + ".focus()")
}
if(event.keyCode == 40)
{
var id = window.event.srcElement.name
id = id.substr(1)
id = parseInt(id) + 1
if(id > 12) id = 1
eval("document.form1.d" + id + ".focus()")
}
}
</script>
function test(obj)
{
if(event.keyCode == 38)
{
var id = window.event.srcElement.name
id = id.substr(1)
id = parseInt(id) - 1
if(id < 1) id = 12
eval("document.form1.d" + id + ".focus()")
}
if(event.keyCode == 40)
{
var id = window.event.srcElement.name
id = id.substr(1)
id = parseInt(id) + 1
if(id > 12) id = 1
eval("document.form1.d" + id + ".focus()")
}
}
。<form name="form1" method="post" action="">
  <p> (1)
    <input type="text" name="d1" onkeydown="test(this)">
  </p>
  <p> (2)
    <input type="text" name="d2" onkeydown="test(this)">
  </p>
  <p> (3)
    <input type="text" name="d3" onkeydown="test(this)">
  </p>
  <p> (4)
    <input type="text" name="d4" onkeydown="test(this)">
  </p>
  <p> (5)
    <input type="text" name="d5" onkeydown="test(this)">
<p> (6)
    <input type="text" name="d6" onkeydown="test(this)">
<p> (7)
    <input type="text" name="d7" onkeydown="test(this)">
<p> (8)
    <input type="text" name="d8" onkeydown="test(this)">
<p> (9)
    <input type="text" name="d9" onkeydown="test(this)">
<p> (10)
    <input type="text" name="d10" onkeydown="test(this)"> <p> (11)
    <input type="text" name="d11" onkeydown="test(this)"> <p> (12)
    <input type="text" name="d12" onkeydown="test(this)">
  </p>
</form>
<script>
function test(obj)
{
if(event.keyCode == 38)
{
var id = window.event.srcElement.name
id = id.substr(1)
id = parseInt(id) - 1
if(id < 1) id = 12
eval("document.form1.d" + id + ".focus()")
}
if(event.keyCode == 40)
{
var id = window.event.srcElement.name
id = id.substr(1)
id = parseInt(id) + 1
if(id > 12) id = 1
eval("document.form1.d" + id + ".focus()")
}
}
</script>
<script>
function test(obj)
{
if(event.keyCode == 38)
{
var id = window.event.srcElement.name
id = id.substr(1,1)
id = parseInt(id) - 1
if(id < 1) id = 12
eval("document.form1.d" + id + ".focus()")
}
if(event.keyCode == 40)
{
var id = window.event.srcElement.name
id = id.substr(1,id.length-1)
id = parseInt(id) + 1
if(id > 12) id = 1
eval("document.form1.d" + id + ".focus()")
}
}
</script>
sorry，改了一处
<script>
function test(obj)
{
if(event.keyCode == 38)
{
var id = window.event.srcElement.name
id = id.substr(1,id.length-1)
id = parseInt(id) - 1
if(id < 1) id = 12
eval("document.form1.d" + id + ".focus()")
}
if(event.keyCode == 40)
{
var id = window.event.srcElement.name
id = id.substr(1,id.length-1)
id = parseInt(id) + 1
if(id > 12) id = 1
eval("document.form1.d" + id + ".focus()")
}
}
</script>
这样用
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<script language="javascript">
var cols=1;
var obj;
var CanMove=false;
var key;
function setobj(input){
obj=input;//捕获当前控件对象；
}//初始化，用KeyDown和KeyUp方法改写原来的onkeydown和onkeyup方法；
function init(){
document.onkeydown=keyDown;
document.onkeyup=keyUp;
}
function keyDown(DnEvents){
var key=window.event.keyCode;
if(key==116){
window.event.keyCode=0;//屏蔽F5(刷新)键；
return false;
}
if(key==8){
if(event.srcElement.tagName!="INPUT"){
event.cancelBubble = true;//如果控件当前类型为“input”，屏蔽退格键；
event.returnValue = false;
return false;
}
} for(var i=0;i<document.forms[0].elements.length;i++){
if(document.forms[0].elements[i]==obj){
if (key == 37){//←
if(i>0){
document.forms[0].elements[i-1].focus();
}
}
if (key == 38){//↑
if(i>cols-1){
document.forms[0].elements[i-cols].focus();
}
}
if (key == 39){//→
if(i<document.forms[0].elements.length-1){
document.forms[0].elements[i+1].focus();
}
}
if (key == 40){//↓
if(i<document.forms[0].elements.length-cols){
document.forms[0].elements[i+cols].focus();
}
}
}
}}function keyUp(UpEvents){
return false;
}
</script>
</head><body bgcolor="#FFFFFF" text="#000000" onload="init()">
<form>
  <p> (1)
    <input type="text" name="d1" onfocus="setobj(this)">
  </p>
  <p> (2)
    <input type="text" name="d2" onfocus="setobj(this)">
  </p>
  <p> (3)
    <input type="text" name="d3" onfocus="setobj(this)">
  </p>
  <p> (4)
    <input type="text" name="d4" onfocus="setobj(this)">
  </p>
  <p> (5)
    <input type="text" name="d5" onfocus="setobj(this)">
<p> (6)
    <input type="text" name="d6" onfocus="setobj(this)">
<p> (7)
    <input type="text" name="d7" onfocus="setobj(this)">
<p> (8)
    <input type="text" name="d8" onfocus="setobj(this)">
<p> (9)
    <input type="text" name="d9" onfocus="setobj(this)">
<p> (10)
    <input type="text" name="d10" onfocus="setobj(this)">
<p> (11)
    <input type="text" name="d11" onfocus="setobj(this)">
<p> (12)
    <input type="text" name="d12" onfocus="setobj(this)">
  </p>
</form>
</body>
</html>