用jquery在组合框中选择值

<select id=\"mySelect\">
    <option value=\"foo\">Foo</option>
    <option value=\"bar\">Bar</option>
    <option value=\"quux\">Quux</option>
</select>

$(\"#mySelect\").val(\"quux\");

$(\"#yourselect\").next().attr(\'selected\', \'selected\');

<select id=\"your\" />aa
<select id=\"yourselect\" />bb
<select id=\"yourselect2\" />cc

$(\'#select\').val(\'3\');

<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js\"></script>
<select id=\"select\">
    <option value=\"1\">ABC</option>
    <option value=\"2\">DEF</option>
    <option value=\"3\">XYZ</option>
</select>