html:

<div class="x_addtable">

   <div class="x_zs_btn tr mt10">

         <button type="button" class="btn btn-sm f14 x_btn" id="x_btn">+</button>

         <button type="button" class="btn btn-sm f14 x_btn" id="x_btn1">-</button>

    </div>

</div>

js:

<sctipt>

//追加报告表单

   $('.x_zs_btn button#x_btn').on('click',function(){

        var htmladd="";

        htmladd +='<div class="x_add_details mb20">';

        htmladd +='<input class="form-control mb20" type="text"  placeholder="请输入标题">';

        htmladd +=' <textarea name="" id="" rows="3" placeholder="请输入内容"></textarea>';

        htmladd +=' </div>';

        $(".x_addtable").append(htmladd);

        $('.x_zs_btn button#x_btn1').show()

    })

</script>