方法：獲取多選下拉框對象數組→循環判斷option選項的selected屬性（true為選中，false為未選中）→使用value屬性取出選中項的值。實例演示如下：
1、HTML結構
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<
select
id
=
"test"
multiple
=
"true"
>
<
option
value
=
"option-A"
>option-A</
option
>
<
option
value
=
"option-B"
>option-B</
option
>
<
option
value
=
"option-C"
>option-C</
option
>
<
option
value
=
"option-D"
>option-D</
option
>
</
select
>
<
input
type
=
"button"
value
=
"確定"
onclick
=
"fun()"
/>
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2、javascript代碼
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function
fun(){
var
select = document.getElementById(
"test"
);
var
str = [];
for
(i=0;i<select.length;i++){
if
(select.options[i].selected){
str.push(select[i].value);
}
}
alert(str);
}
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3、效果演示
