html代码：
<!DOCTYPE html><html lang="en"><head> ?<meta charset="UTF-8"> ?<title>Title</title> ?<script src="http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js"></script></head><body></body><script> ?$(function () { ???$.ajax({ ???????url: "http://localhost/php/select_data.php", ???????type: "post", ???????data: {id: "id"}, ???????dataType: "jsonp", ???????jsonp: "callback",//传递给请求处理程序或页面的，用以获得jsonp回调函数名的参数名(默认为:callback) ???????jsonpCallback: "success_jsonpCallback",//自定义的jsonp回调函数名称，默认为jQuery自动生成的随机函数名 ???????success: function (data) { ?????????for(let i in data){ ???????????console.log(eval("(" + data[i] + ")")) ?????????} ???????}, ???????error: function (error) { ?????????console.log("error", error) ???????} ?????} ???) ?})</script></html>PHP代码：
<?php/** * Created by PhpStorm. * User: DELL * Date: 2017/12/8 * Time: 14:31 */$callback = isset($_REQUEST[‘callback‘]) ? trim($_REQUEST[‘callback‘]) : ‘‘; //jsonp回调参数，必需function getKey($key,$default=""){ ???return trim(isset($_REQUEST[$key])?$_REQUEST[$key]:$default);}$id = getKey("id");$conn = mysqli_connect("localhost","root","","test") or die("连接失败");$conn->query("set names utf8");$sql = "select * from data where ".$id." is not null";$result = $conn->query($sql);$arr = [];while($row=$result->fetch_assoc()){ ???array_push($arr,json_encode($row));}$json = json_encode($arr); ?//json 数据echo $callback.‘(‘.$json.‘)‘; ?//返回格式，必需效果如下：
使用PHP，jsonp，jquery实现跨域
原文地址：http://www.cnblogs.com/mmykdbc/p/8021912.html