Solution Angularjs ng-options first option is empty

The structure of Angularjs's ng-options is generally the same when rendered onto the page.

<select>

<option value= "" ></option>

<option value= "1" > Beijing </option>

< /select>

This causes the Select First act to be empty and the user experience is poor. So the code after the transformation is as follows

<select>

<option value= "" Selected hidden></option>

<option value= "1" > Beijing </ Option>

</select>

This prevents the first line from being empty. With absolute positioning and adding a div, you can make a nice drop-down list style