By default, the select drop-down box selects the solution ligerui that the selected attribute does not work

select The drop-down box is selected by default selected Property does not work
browser —360 browser
System —win10
frame —ligerui

The original code :

        <td align="left" class="l-table-edit-td">
            <select name="DEP_CAT" id="DEP_CAT">
                <option value="" selected="selected">-  Query all  -</option>
                <option value="0"> personal </option>
                <option value="1"> company </option>
            </select>
        </td>

After changing the code , Remove value="" , that will do , Unknown cause

<td align="left" class="l-table-edit-td">
        <select name="DEP_CAT" id="DEP_CAT">
            <option  selected="selected">-  Query all  -</option>
            <option value="0"> personal </option>
            <option value="1"> company </option>
        </select>
    </td>

But after the change , The data obtained in the background ,value Not empty , It is “ Query all ”, It needs to be dealt with