Change your data-style to btn-new like this: <select data-style="btn-new"> .... </select>. And then style that button like this: ... <看更多>

When Bootstrap 4 version is not auto detected and is set manually with: $.fn.selectpicker.Constructor.BootstrapVersion = '4'; the dropdown ... ... <看更多>

You can require bootstrap plugin via cdn or download the archive with release and unzip into ... <link rel="stylesheet" href="css/select.min.css"> <script ... ... <看更多>

bootstrap drop down list examplebootstrap button dropdown ... dropdown menu divider bootstrap dropdown ... ... <看更多>

Bootstrap Select is a custom select / multiselect for Bootstrap using button dropdown, designed to behave like regular Bootstrap selects. ... <看更多>