```html

```css
/* styles.css */
#teacher-select {
width: 100%;
}

#student-select {
width: 100%;
display: none;
}
```

```js
// multipleSelect.js
$(function() {
$('#teacher-select').multipleSelect({
width: 120,
allSelected: '全部',
multiple: false,
selectAll: false,
placeholder: '未选择'
});

$('#student-select').on('change', function() {
var teachers = $('#teacher-select').val();
if (!teachers) {
$('#student-select').empty();
} else {
for (var i = 0; i < teachers.length; i++) {
var student = teachers[i];
$('#student-select').append('' + student.name + '');
}
}
$('#student-select').show();
});
});
```

```javascript
// main.js
function teacherChange() {
var teacherId = $('#teacher-select').val();
if (teacherId === '') {
$('#student-select').empty();
} else {
var students = [];
if (teacherId) {
$(teachers).each(function() {
if ($(this).attr('id') === teacherId) {
students = $(this).children('option');
return false;
}
});
}
var r = [];
for (var i = 0; i < students.length; i++) {
r.push('' + students[i].text + '');
}
$('#student-select').empty();
$('#student-select').append(r.join('\n'));
$('#student-select').show();
}
}
```

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