<textarea name="jfcate_name" rows="10" class="layui-textarea" onkeydown="if(event.keyCode==13)return false;">{$row['jfcate_name']}</textarea>

<textarea name="jfcate_name" rows="10" class="layui-textarea" onpaste="this.value=this.value.replace(/\r|\n/ig,'')" onkeyup="this.value=this.value.replace(/\r|\n/ig,'')">{$row['jfcate_name']}</textarea>