需求，点击添加按钮，生成input输入框，如果上一个输入框为空，则弹出提示框提示，若不为空，则生成一行input框。
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class="row"> <div class="form-group"> <label class="col-md-1 col-sm-1 col-xs-1 control-label">设备编号:</label> <div class="col-md-4 col-sm-4 col-xs-4"> <input type="text" class="form-control number" placeholder="请输入编号" id=""> </div> </div> </div> <div id="opts"></div> <div class="row"> <div class="col-md-12 col-sm-12 col-xs-12"> <div class="form-group"> <button id="fat-btn" class="btn btn-primary" type="button">添加 </button> </div> </div> </div> </body> <script> $(function() { $("#fat-btn").click(function() { if($(".number:last").val() == "") { alert(1) } else { var htm = ""; htm += " <div class='row'>"; htm += " <div class='form-group'>"; htm += " <label class='col-md-1 col-sm-1 col-xs-1 control-label'>设备编号:</label>"; htm += " <div class='col-md-4 col-sm-4 col-xs-4'>"; htm += " <input type='text' class='form-control number' placeholder='请输入编号' id=''>"; htm += " </div></div>"; htm += "</div>"; $('#opts').append(htm); } }); }); </script>
