ajax调用返回php接口返回json数据的方法(必看篇)

php代码如下：

<?php

 header('Content-Type: application/json');
 header('Content-Type: text/html;charset=utf-8');

 $email = $_GET['email'];

 $user = [];

 $conn = @mysql_connect("localhost","Test","123456") or die("Failed in connecting database");
 mysql_select_db("Test",$conn);
 mysql_query("set names 'UTF-8'");
 $query = "select * from UserInformation where email = '".$email."'";
 $result = mysql_query($query);
 if (null == ($row = mysql_fetch_array($result))) {
 echo $_GET['callback']."(no such user)";
 } else {
 $user['email'] = $email;
 $user['nickname'] = $row['nickname'];
 $user['portrait'] = $row['portrait'];
 echo $_GET['callback']."(".json_encode($user).")";
 }

?>

js代码如下：

<script>
 $.ajax({
 url: "http://test.localhost/UserInterfaceForChatroom/UserInformation.php?email=pshuyue@gmail.com",
 type: "GET",
 dataType: 'jsonp',
 // crossDomain: true,
 success: function (result) {
 // data = $.parseJSON(result);
 // alert(data.nickname);
 alert(result.nickname);
 }
 });
 </script>

其中遇到了两个问题：

1、第一个问题：

Uncaught SyntaxError: Unexpected token :

解决方案如下：

This has just happened to me, and the reason was none of the reasons above. I was using the jQuery command getJSON and adding callback=? to use JSONP (as I needed to go cross-domain), and returning the JSON code {"foo":"bar"} and getting the error.

This is because I should have included the callback data, something like jQuery17209314005577471107_1335958194322({"foo":"bar"})

Here is the PHP code I used to achieve this, which degrades if JSON (without a callback) is used:

$ret['foo'] = "bar";
finish();

function finish() {
 header("content-type:application/json");
 if ($_GET['callback']) {
 print $_GET['callback']."(";
 }
 print json_encode($GLOBALS['ret']);
 if ($_GET['callback']) {
 print ")";
 }
 exit; 
}

Hopefully that will help someone in the future.

2、第二个问题：

解析json数据。从上面的javascript中可以看到，我没有使用jquery.parseJSON()这些方法，开始使用这些方法，但是总是会报

VM219:1 Uncaught SyntaxError: Unexpected token o in JSON at position 1的错误，后来不用jquery.parseJSON()这个方法，反而一切正常。不知为何。

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