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JSONP案例ID获取商品信息
零龙
Original
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JSONP通过ID货物商品信息

- 准备环境：两个端口不一样，构成跨域请求的条件。

- 获取数据的网址：http://www.a.com 本机地址：http://www.php.com

- goods.html 通过点击事件查看商品信息(本地文件)

- goods.php 处理商品信息，返回

演示代码：goods.html

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <title>点击按钮获取商品信息</title>
  7. </head>
  8. <body>
  9.     <button>查看</button>
  11.     <script>
  13.         function handle(data)
  14.         {
  15.             console.log(data);
  16.             var ul = document.createElement("ul");
  17.             var obj = JSON.parse(data);
  18.             ul.innerHTML += '<li>' + obj.title + '</li>';
  19.             ul.innerHTML += '<li>' + obj.goods.type + '</li>';
  20.             ul.innerHTML += '<li>' + obj.goods.goodname + '</li>';
  21.             ul.innerHTML += '<li>' + obj.goods.price + '</li>';
  22.             document.body.appendChild(ul);
  24.         }
  25.        var but =document.querySelector("button");
  27.        but.addEventListener("click",function()
  28.        {
  29.             var script = document.createElement("script");
  30.             script.src = "http://www.a.com/goods.php?id=2&jsonp=handle";
  31.             document.head.appendChild(script);
  32.        });
  36.     </script>
  37. </body>
  38. </html>

演示代码：goods.php

  2. <?php
  3. header("Content-type:text/html;charset=utf-8");
  4. //设置默认字符集
  5. $id = $_GET['id'];
  6. $callback = $_GET['jsonp'];
  8. $goodss = [
  9.     '{"type":"大家电","goodsname":"电视机","price":"3200"}',
  10.     '{"type":"通讯设备","goodsname":"小米10 pro","price":"6800"}',
  11.     '{"type":"通讯设备","goodsname":"苹果12 pro","price":"13200"}',
  12.     '{"type":"办公设备","goodsname":"联想Thinkpad","price":"6200"}',
  13.     '{"type":"家居","goodsname":"罗莱家纺","price":"530"}'
  14. ];
  15. //由于传入ID的值从1开始，通过$id-1才能得到查询的正确id
  16. if(array_key_exists(($id-1),$goodss))
  17. {
  18.    //查询$goods中键值等于$id的商品。
  19.    $goods = $goodss[$id-1];
  20. }
  22. // $json = '{}';   定义josn格式 
  24. $json = '{
  25.       "title":"商品信息",
  26.       "goods": '. $goods .'
  27. }';
  29. //返回handle函数
  30. $jsons = json_encode($json);
  32. echo $callback.'('. $jsons .')';

示例图：

事件代理的案例

示例：

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <title>事件代理</title>
  7. </head>
  8. <ul>
  9.     <li>1111</li>
  10.     <li>2222</li>
  11.     <li>3333</li>
  12.     <li>4444</li>
  13.     <li>5555</li>
  15. </ul>
  17. <body>
  19.     <script>
  20.        var ul = document.querySelector("ul");
  22.        ul.addEventListener("click",function(ev)
  23.        {
  24.           var lis = ev.target;
  25.          if(lis.tagName.toLowerCase()=='li')
  26.          {
  27.             lis.style.background="red";
  28.          }
  32.        });
  33.        ul.addEventListener("mouseout",function(ev)
  34.        {
  35.                ev.target.style.background = "";
  37.        });
  40.     </script>
  41. </body>
  42. </html>

示例图：

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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