[CODE]
<script language="JavaScript">
function bb(str){
 document.form1.in1.value=str;
}
</script>
<form name="form1" method="post" action="">
                  <select name="ss" onChange="bb(document.form1.ss.options[document.form1.ss.selectedIndex].value)">
                    <option value="请选择" selected>请选择</option>
     <option value="选项一">选项一</option>
                    <option value="选项二">选项二</option>
                  </select>
                  <br>
                  <input type="text" name="in1">
                </form>[/CODE]
这是javascript问题