前端总结

控制设备显隐

方法一：

<input type="button" id="sfsfd" style="margin-left: 10px" onclick="SelectVisible()" class=" btn" />


<div id="collapseTwo" style="display: none">
                        <div class="row" style="padding-top: 10px;">
                            <div class="col-xs-12">
                                <div class="col-xs-2">
                                    <input type="text" class="form-control" id="22" placeholder="请输入学号" />
                                div>
                                <div class="col-xs-2">
                                    <input type="text" class="form-control" id="33" placeholder="请输入姓名" />
                                div>
                                <div class="col-xs-2">
                                    <button class="btn btn-primary btn-sm" id="44">查询button>
                                    <button class="btn btn-sm" id="23">重置button>
                                div>
                            div>
                        div>
                    div>



   function SelectVisible() {
                var divp = document.getElementById('collapseTwo');
                debugger;
                if (divp.style.display == "none") {
                    divp.style.display = "block"; 
            }
            else if (divp.style.display == "block") {
                divp.style.display = "none";
            }

方法二：  https://blog.csdn.net/qq_37103514/article/details/80897545

服务器控件使用

   1、给asp:DropDownList 服务控件添加OnSelectedIndexChanged事件的同时，需要设置AutoPostBack="true"  属性