:selected Selector
selected selector
version added: 1.0jQuery(':selected')
描述： 选择所有被选中的元素。
:selected 选择器为<option>元素工作。它不适用复选框和单选框，复选框和单选框请使用:checked。
Example:
Attaches a change event to the select that gets the text for each selected option and writes them in the div. It then triggers the event for the initial text draw.
<!DOCTYPE html>
<html>
<head>
<style>
div { color:red; }
</style>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
<select name="garden" multiple="multiple">
<option>Flowers</option>
<option selected="selected">Shrubs</option>
<option>Trees</option>
<option selected="selected">Bushes</option>
<option>Grass</option>
<option>Dirt</option>
</select>
<div></div>
<script>
$("select").change(function () {
var str = "";
$("select option:selected").each(function () {
str += $(this).text() + " ";
});
$("div").text(str);
})
.trigger('change');
</script>
</body>
</html>