<th><input type="checkbox" name="title" id="checkbox_all"/></th>

{% for student in students %}

    <tr>

       <td><input type="checkbox" name="student_name" id="boxes" value="{{ student.number }}"/></td>

$('#checkbox_all').click(function () {

                    var a = document.getElementsByTagName("input");

                    if (document.getElementById("checkbox_all").checked == true) {

                        for (var i = 0; i < a.length; i++)

                            if (a[i].type == "checkbox") a[i].checked = true;

                    }

                    else {

                        for (var i = 0; i < a.length; i++)

                            if (a[i].type == "checkbox") a[i].checked = false;

                    }

                }

        );

$('#input_student').click(function () {

                var arr = new Array();

                var sign = 0;

                var inputs = document.getElementsByTagName('input');//获取所有的input标签对象。

                for (var i = 0; i < inputs.length; i++) {

                    var obj = inputs[i];

                    if (obj.type == 'checkbox') {

                        if (obj.checked == true) {

                            sign = 1;

                            var length = arr.push(obj.value);

                        }

                    }

                }

                if (sign == 0)//没有被选择项

                {

                    alert("请勾选要下载的数据！");

                    return;

                }

                if (!confirm("确定下载选中的条目吗？")) return;

                var form = $("<form>");

                form.attr('style', 'display:none');

                form.attr('target', '');

                form.attr('method', 'post');

                form.attr('action', '{% url "teacher:downloadStu" %}');

                var input1 = $('<input>');

                input1.attr('type', 'hidden');

                input1.attr('name', 'number');

                input1.attr('value', arr.join("&"));

                $('body').append(form);

                form.append(input1);

                form.submit();

                form.remove();

                });