HyperLesson/Teacher/MyRecycle-T.aspx

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<%@ Page Title="" Language="C#" MasterPageFile="~/SiteTeacher.Master" AutoEventWireup="true" CodeBehind="MyRecycle-T.aspx.cs" Inherits="HyperLesson.MyRecycle_T" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <style>
        input[type=submit]:hover {
            cursor: pointer;
            color: white;
            background-color: orangered;
            border:1px solid black;
        }
        .mailist input[type=checkbox] {
            position: relative;
            top: 5px;
            left: 15px;
            width: 20px;
            height: 20px;
        }

        .toolbar input[type=checkbox] {
            width: 50px;
            height: 20px;
            line-height: 20px;
            position: relative;
            top: 16px;
        }
        .toolbar span{
            position:relative;
            top:12px;
            margin-right:-10px;
        }
        .hidder{
            background-color:antiquewhite;
            opacity:0;
        }
        .MailPage{
            background-color:tomato;
        }
        </style>
        <script>
        /* 全选功能*/
        function GetAllCheckBox(cbAll) {
            var items = document.getElementsByTagName("input");
            for (i = 0; i < items.length; i++) {
                if (items[i].type == "checkbox") {
                    items[i].checked = cbAll.checked;
                }
            }
            }
        //反选
        function fan() {
            //1.获取所有多选框标签
            let checkBoxObjs = document.querySelectorAll("input[type='checkbox']");
            //2.遍历
            for (let checkBOxObj of checkBoxObjs) {
                checkBOxObj.checked = !checkBOxObj.checked;//使用感叹号（否）进行反选
            }
        }
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <div class="embox">