try_dom_select_multiple 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<script>
function selectMultiple()
{
document.getElementById("mySelect").multiple=true;
}
</script>
</head>
<body>
<form>
<select id="mySelect" size="4">
    <option>Apple</option>
    <option>Pear</option>
    <option>Banana</option>
    <option>Orange</option>
</select>
<input type="button" onclick="selectMultiple()" value="Select multiple">
</form>
<p>Before you click on the "Select multiple" button, try to select more than one option (by holding down the Shift or Ctrl key). Then click on the "Select multiple" button and try again.</p>
</body>
</html>
 
 
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