First download the jquery.multiselect.js plug-in and then copy the following code. Just change the path to implement a multi-select drop-down box. If it is useful, please support it! Copy code The code is as follows: <br><!--<BR>body {<BR> margin-left: 5px;<BR> margin-top: 5px;<BR> margin-right: 5px;<BR> margin-bottom: 5px;<BR>}<BR>--><br> <br>$(function() {<br> $("#company").multiselect();<br><br>});<br> ;option value="Northern Company" selected="selected">Northern Company【Head Office】 Southwestern Company ;