关于Select选择的Javascript问题，很简单的，送分！！！谢谢。

test...<form name="list" action="#" method="post">
<select name="user" onchange="this.form.name.value=this.value">
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option>
<option>
<input type="text" name="name" value="默认">
</form>

解决方案 »

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<script>
function get(){
alert(list.user.length);
for (i=0;i<list.user.length;i++)
{if (i!=2) {list.name.value=list.user[i].text;}
else alert('你选的是王五');
}
}
</script>
<form name="list" action="#" method="post">
<select name="user" onChange="get()">
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option>
</select>
<input type="text" name="name" onclick=get()>
</form>
<html><head>
</head><body>
<form name="list" action="#" method="post">
<select name="user" onchange="list.name.value=this.value">
<option value="张三">张三</option>
<option value="李四">李四</option>
<option value="王五" selected>王五</option>
<option value="赵六">赵六</option>
<option>
<input type="text" name="name" value="默认">
</form></body></html>
几种方法都不能实现，如果我选择了其它几个选项后，再选定初始的选项的时候，无法将起初的input中的值还原为“默认”这个值。怎么办？
<script>
function changeselect()
{
if(this.form1.user.selected)
{
this.form1.name.value="默认";
}
else
{
this.form1.name.value=this.form1.user.value;
}
return false;
}
</script>
<form name="form1" action="#" method="post">
<select name="user" onchange=changeselect()>
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option>
<input type="text" name="name" value="默认">
</form>
<script>
function changeselect()
{
if(this.form1.user.selected)
{
this.form1.name.value="默认";
}
else
{
this.form1.name.value=this.form1.user.value;
}
return false;
}
</script>
<form name="form1" action="#" method="post">
<select name="user" onchange=changeselect()>
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option><input type="text" name="name" value="默认">
</form><script>
document.forms[0].name.value=document.forms[0].user.options[2].value;
</script>
换成这个最好.<script>
function changeselect()
{
if(this.form1.user.selected)
{
this.form1.name.value="默认";
}
else
{
this.form1.name.value=this.form1.user.value;
}
return false;
}
</script>
<form name="form1" action="#" method="post">
<select name="user" onchange=changeselect()>
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option><input type="text" name="name" value="默认">
</form><script>
document.forms[0].name.value=document.forms[0].user.value;
</script>
换成这个最好.<script>
function changeselect()
{
if(this.form1.user.selected)
{
this.form1.name.value="默认";
}
else
{
this.form1.name.value=this.form1.user.value;
}
return false;
}
</script>
<form name="form1" action="#" method="post">
<select name="user" onchange=changeselect()>
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option><input type="text" name="name" value="默认">
</form><script>
document.forms[0].name.value=document.forms[0].user.value;
</script>
这样不就成了吗！
<html><head>
</head><body>
<form name="list" action="#" method="post">
<select name="user" onchange="list.name.value=this.value">
<option value="张三">张三</option>
<option value="李四">李四</option>
<option value="默认" selected>王五</option>
<option value="赵六">赵六</option>
<option>
<input type="text" name="name" value="默认">
</form></body></html>
wtoeb(爱到尽头)
  很不好意思,看错了....
TO myblessu(寒飞)
这个方法也不行，请帮我多试一下吧？？？
打开页面根本不能显示“默认”，选择“王五”也不能将input的值变成“默认”
wtoeb(爱到尽头) 是这个啦.先求出初选的值,在判断.<form name="form1" action="#" method="post">
<select name="user" onchange=changeselect()>
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option><input type="text" name="name" value="默认">
</form><script>
mm=document.forms[0].user.value;function changeselect(){
if(this.form1.user.value==mm)
{
this.form1.name.value="默认";
}
else
{
this.form1.name.value=this.form1.user.value;
}
return false;
}</script>
TO zhaoweiwei(轩辕大侠)：
哈，那个value也被你改了，但这里需要的是数值。
wtoeb(MicrosoftABC.COM)   这个不行吗?<form name="form1" action="#" method="post">
<select name="user" onchange=changeselect()>
<option value="1001">张三</option>
<option value="1002">李四</option>
<option value="1003" selected>王五</option>
<option value="1004">赵六</option><input type="text" name="name" value="默认">
</form><script>
mm=document.forms[0].user.value;function changeselect(){
if(this.form1.user.value==mm){
      this.form1.name.value="默认";
}else{
     this.form1.name.value=this.form1.user.value;
}
return false;
}</script>