bootstrap 通过加减按钮实现输入框组功能

<div class="input-group" id="centerIpGroup"> 
  <label class="input-group-addon" id="basic-addon5">中心机IP:</label>   
  <button class="btn btn-info" type="button" data-toggle="tooltip" title="新增" id="addCenterIpGrpBtn" onclick="addCenterIpGrp(this)" disabled><span class="glyphicon glyphicon-plus"></span></button>    
</div> 

//添加中心机IP输入框项 
  function addCenterIpGrp(obj){ 
    html = '<div class="input-group centerIp">'+ 
          '<label class="input-group-addon">IP：</label>'+ 
          '<input type="text" class="form-control" id="ipInput">'+ 
          '<label class="input-group-addon">注释：</label>'+ 
          '<input type="text" class="form-control" id="descInput">'+ 
          '<span class="input-group-btn">'+ 
                '<button class="btn btn-info" type="button" data-toggle="tooltip" title="删除" id="delCenterIpGrp"><span class="glyphicon glyphicon-minus"></span></button>'+ 
          '</span>'+ 
        '</div>' 
    obj.insertAdjacentHTML('beforebegin',html) 
  } 

$(document).on('click','#delCenterIpGrp',function(){ 
  var el = this.parentNode.parentNode 
  var centerIp = $(this).parent().parent().find('#ipInput').val() 
  alertify.confirm('您确定要删除选中的命令？', 
  function(e){ 
    if(e){ el.parentNode.removeChild(el)}})})