<select class="settlement">
<option value="1">------请选择------</option>
<option>Headquarters</option>
<option>Branch</option>
<option value="1">------请选择------</option>
<option>Headquarters</option>
<option>Branch</option>
</select>
$(".settlement").val("1");
This method implements the default selection
.settlement is the class value of the value select tag, 1 refers to the value value of the option tag I want to select, to achieve the default selection