<span style="border:1px solid green; position:absolute">
<select style="margin: -2 -18 -2 -2">
<option>1111</option>
<option>11111111111111</option>
<option>111111111</option>
</select></span>根据这个思路你再发挥吧
<select style="margin: -2 -18 -2 -2">
<option>1111</option>
<option>11111111111111</option>
<option>111111111</option>
</select></span>根据这个思路你再发挥吧
<select style="margin: -2px">
<option>1111</option>
<option>11111111111111</option>
<option>111111111</option>
</select></span>