modal

           <button type="button" class="btn btn-primary" id="change">更改密码button>
            <div class="row">
                
                <div id="myModal" tabindex="-1" class="modal fade" role="dialog">
                    <div class="modal-dialog modal-sm" style="background-color: #FFFFFF;">
                        <div class="modal-header">
                            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×span>button>
                            <h4 class="modal-title">Titleh4>
                        div>
                        <div class="modal-body">
                            <form class="form">
                                <div class="form-group">
                                    <label for="username">UserNamelabel>
                                    <input type="text" class="form-control" name="username" />
                                div>
                                <div class="form-group">
                                    <label for="password">Passwordlabel>
                                    <input type="password" class="form-control" name="password" />
                                div>
                                <div class="form-group">
                                    <label for="confirmPassword">confirmPasswordlabel>
                                    <input type="password" class="form-control" name="confirmPassword" />
                                div>
                            form>
                        div>
                        <div class="modal-footer text-center">
                            <div class="form-group">
                                <button type="button" class="btn btn-sm btn-primary form-control" id="save">保存button>
                            div>
                        div>
                    div>
                div>
            div>

$('#save').click(function(){
        let data = {
            'username': $('input[name="username"]').val(),
            'password': $('input[name="password"]').val(),
            'confirmPassword': $('input[name="confirmPassword"]').val()
        };
        console.log(data);
         // 执行操作
        // $('#myModal').modal('hide'); 关闭模态框
    });
    // 显示模态框
    $('#change').click(function(){
        $('#myModal').modal('show'); //开启模态框
    });