ajax实现调用返回php接口返回json数据的方法

本篇文章主要介绍ajax实现调用返回php接口返回json数据的方法，感兴趣的朋友参考下，希望对大家有所帮助。

php代码如下：

<?php

  header(&#39;Content-Type: application/json&#39;);
  header(&#39;Content-Type: text/html;charset=utf-8&#39;);

  $email = $_GET[&#39;email&#39;];

  $user = [];

  $conn = @mysql_connect("localhost","Test","123456") or die("Failed in connecting database");
  mysql_select_db("Test",$conn);
  mysql_query("set names &#39;UTF-8&#39;");
  $query = "select * from UserInformation where email = &#39;".$email."&#39;";
  $result = mysql_query($query);
  if (null == ($row = mysql_fetch_array($result))) {
    echo $_GET[&#39;callback&#39;]."(no such user)";
  } else {
    $user[&#39;email&#39;] = $email;
    $user[&#39;nickname&#39;] = $row[&#39;nickname&#39;];
    $user[&#39;portrait&#39;] = $row[&#39;portrait&#39;];
    echo $_GET[&#39;callback&#39;]."(".json_encode($user).")";
  }

?>

js代码如下：

<script>
    $.ajax({
      url: "http://test.localhost/UserInterfaceForChatroom/UserInformation.php?email=pshuyue@gmail.com",
      type: "GET",
      dataType: &#39;jsonp&#39;,
      //      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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