错误提示：TypeError，请帮忙看看下面什么错？奇怪了
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />
<title> 无标题文档 </title>
<script language= "javascript ">
var t;
t = prompt( "请问您的姓名： ",0);
try
{
if(t != null || t != " ")
{
document.form1.textfield.value = t;
}
else
{
document.form1.textfield.value = " ";
}
}
catch(err)
{
alert(err.name);
}
t = prompt( "请问您的年龄？ ");
document.form1.textfield2.value = t;
if(window.confirm( "您是男的? "))
{
document.form1.textfield3.value = "男人 ";
}
else
{
document.form1.textfield3.value = "女人 ";
}
function getAllValue()
{
var k = document.form1;
document.writeln(k.textfield.value + " <br> " + k.textfield2.value + " <br> " + k.textfield3.value + " <br> " + document.body.innerHTML);
}
</script>
</head>
<body>
<form id= "form1 " name= "form1 " method= "post " action= " ">
<table width= "100% " border= "0 " cellpadding= "3 " cellspacing= "1 " bgcolor= "#000000 ">
<tr>
<td bgcolor= "#FFFFFF "> <label for= "textfield "> 姓名： </label>
<input type= "text " name= "textfield " id= "textfield " /> </td>
</tr>
<tr>
<td bgcolor= "#FFFFFF "> <label for= "label "> 年龄： </label>
<input type= "text " name= "textfield2 " id= "label " /> </td>
</tr>
<tr>
<td bgcolor= "#FFFFFF "> <label for= "label2 "> 性别 </label>
<input type= "text " name= "textfield3 " id= "label2 " /> </td>
</tr>
<tr>
<td bgcolor= "#FFFFFF "> <label for= "Submit "> 确定 </label>
<input type= "button " name= "Submit " value= "确定 " id= "Submit " onClick= "getAllValue() "/> </td>
</tr>
</table>
</form>
</body>
</html>
在测试的过程中，发现会catch到错误，错误名为：TypeError。怎么会类型错误呢？
谢谢！
[解决办法]
执行顺序问题，文本输入框应放在前面，或者加个defer
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />
<title> 无标题文档 </title>
<script language= "javascript " defer>
var t;
t = prompt( "请问您的姓名： ",0);
try
{
if(t != null || t != " ")
{
document.form1.textfield.value = t;
}
else
{
document.form1.textfield.value = " ";
}
}
catch(err)
{
alert(err.name);
}
t = prompt( "请问您的年龄？ ");
document.form1.textfield2.value = t;
if(window.confirm( "您是男的? "))
{
document.form1.textfield3.value = "男人 ";
}
else
{
document.form1.textfield3.value = "女人 ";
}
function getAllValue()
{
var k = document.form1;
document.writeln(k.textfield.value + " <br> " + k.textfield2.value + " <br> " + k.textfield3.value + " <br> " + document.body.innerHTML);
}
</script>
</head>
<body>
<form id= "form1 " name= "form1 " method= "post " action= " ">
<table width= "100% " border= "0 " cellpadding= "3 " cellspacing= "1 " bgcolor= "#000000 ">
<tr>
<td bgcolor= "#FFFFFF "> <label for= "textfield "> 姓名： </label>
<input type= "text " name= "textfield " id= "textfield " /> </td>
</tr>
<tr>
<td bgcolor= "#FFFFFF "> <label for= "label "> 年龄： </label>
<input type= "text " name= "textfield2 " id= "label " /> </td>
</tr>
<tr>
<td bgcolor= "#FFFFFF "> <label for= "label2 "> 性别 </label>
<input type= "text " name= "textfield3 " id= "label2 " /> </td>
</tr>
<tr>
<td bgcolor= "#FFFFFF "> <label for= "Submit "> 确定 </label>
<input type= "button " name= "Submit " value= "确定 " id= "Submit " onClick= "getAllValue() "/> </td>
</tr>
</table>
</form>
</body>
</html>