<?php

require "data_operate.php";
if ($_REQUEST['operate_type'] === "get_one_news") {
    //创建操作对象
    $request = new open_news($_REQUEST['news_id'], $_REQUEST['table_name']);
    //连接数据库
    $request->connect_database();
    //执行sql代码并返回
    echo $request->get_one_news();
    //关闭数据库连接
    $request->close();
}
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>baidu_news</title>
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="renderer" content="webkit">
  <!--使360开启极速模式-->
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="css/new_page.css">
</head>
<body>
<?php 
require "back/data_operate.php";
//创建操作对象
$request = new open_news($_REQUEST['news_id'], $_REQUEST['table_name']);
//连接数据库
$request->connect_database();
//执行sql代码并返回数据
$data = json_decode($request->get_one_news());
//关闭数据库连接
$request->close();
?>

<div class="wrapper">
  <header>
    <div class="top-toolbar"></div>
  </header>
  <div class="content">
    <div class="article">
      <div class="article-header">