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<script language="javascript">
function show(){
alert(document.getElementById("select1").defaultValue)
}
function initSelect()
{
var objs=document.getElementsByTagName("select")
for(var i=0;i<objs.length;i++)
{
objs[i].defaultValue=objs[i].value
}
}
</script>
<body onload="initSelect()">
<select name="select1" onload="">
<option value="1">一</option>
<option value="2">二</option>
<option value="3" selected>三</option>
<option value="4">四</option>
<option value="5">五</option>
<option value="6">六</option>
</select>
<input name="button1" type="button" value="按" onclick="show()">
</body>
<script language="javascript">
function show(){
alert(document.getElementById("select1").defaultValue)
}
function initSelect()
{
document.getElementById("select1").defaultValue=document.getElementById("select1").value
}
</script>
<body onload="initSelect()">
<select name="select1" onload="">
<option value="1">一</option>
<option value="2">二</option>
<option value="3" selected>三</option>
<option value="4">四</option>
<option value="5">五</option>
<option value="6">六</option>
</select>
<input name="button1" type="button" value="按" onclick="show()">
</body>
<script language="javascript">
function showSelectedOption(){
for(var i=0;(e=document.all.select1.options[i]);i++){
if(e.selected){
alert("初始项:"+e.innerText+",值:"+e.value);
break;
}
}
}
</script>
<body onload="showSelectedOption()">
<select name="select1">
<option value="1">一</option>
<option value="2">二</option>
<option value="3" selected>三</option>
<option value="4">四</option>
<option value="5">五</option>
<option value="6">六</option>
</select>
</body>