I checked that there are select2 and bootstrap-select plug-ins, but they don’t have the function of changing the style by floating. Please give me some advice.
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Use F12, check the dom, elements and you will know how to write hover
If you have too many requirements, you can only simulate it yourself, use
<p>
<li></li>
<li></li>
<li></li>
</p>With this structure, you can play however you want
bootstrap-select will convert the option style into
<ul>
<li></li>
<li></li>
<li></li> </ul>
Just set a :hover css style for li
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