1.selectIndex
<select id="opS"> <option value="1"> a</option> <option value="2"> b</option> <option value="3"> c</option> </select> <script> $("opS").selectIndex = 3; //选择 c </script>?
1.selectIndex
<select id="opS"> <option value="1"> a</option> <option value="2"> b</option> <option value="3"> c</option> </select> <script> $("opS").selectIndex = 3; //选择 c </script>?