用JS操作Select

清空 <div class="wp_syntax">
```
selectEle.options.length = ;
```
```
</div>
```

添加 <div class="wp_syntax">

var option = new Option("text1","value1");
 
try{
    selectEle.add(option,null); // for firefox
}catch(e){
    selectEle.add(option,-1); // for IE
}

</div>

也可以直接操作selectEle.options , 不过注意options 是一个伪数组(更arguments 一样), 不是一个数组.

<div class="wp_syntax">
  <div class="code">
    <pre class="javascript" style="font-family:monospace;"><span style="color: #000066;">alert</span><span style="color: #009900;">&#40;</span>selectEle.<span style="color: #660066;">options</span> <span style="color: #000066; font-weight: bold;">instanceof</span> Array <span style="color: #339933;">===</span> <span style="color: #003366; font-weight: bold;">false</span><span style="color: #009900;">&#41;</span></pre>
  </div>
</div>

获得选择的选项. (可以是 multiple 的) <div class="wp_syntax">

var selected = [];
for(var i =  ; i &lt; selectEle.options.length; i ++)
{
    if(selectEle.options[i].selected)
   selected.push(selectEle.options[i]);
}

</div>