select两个联动选择的问题

Question

上面选什么下面跟着选什么，两个select都只有两个参数

Answer 1

 <select name="emp.EFlag" class="selectinput" onchange="setTargetIndex('emp.EAdmin', this.selectedIndex)">
    <option value="0">普通员工</option>
    <option value="1">部门主管</option>
</select><br />
<select name="emp.EAdmin" class="selectinput" onchange="setTargetIndex('emp.EFlag', this.selectedIndex)">
    <option value="0">普通操作者</option>
    <option value="1">部门主管</option>
</select>
<script>
    function setTargetIndex(name, index) {
        document.getElementsByName(name)[0].selectedIndex = index;
    }
</script>