html中,对于一个多选的select来说:
<select multiple="multiple" size="2">
<option value ="volvo">Volvo</option>
<option value ="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
怎样用JavaScript使select多选
$(".SelectControl").find("option[value=8997]")[0].selected = true;
$(".SelectControl").find("option[value=8990]")[0].selected = true;
//document.getElementById("cph_CourseControl")[1].selected = true;
//document.getElementById("cph_CourseControl")[2].selected = true;