Question

我需要将php json对象的值传递给javascript。这就是我这样做的方式;

  <script type="text/javascript"> var msg_top = <?php echo searchResults('windows');?>;
  </script>

这是返回json的php SearchResults函数：

   function searchResults($q) {

      $host = "http://search.twitter.com/search.atom?q=" . urlencode( $q ) . "&rpp=100";
      $ch = curl_init();
      curl_setopt($ch, CURLOPT_URL, $host);
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

    //Raw xml
      $result = curl_exec($ch);
      curl_close($ch);
      $xml = simplexml_load_string($result);
      return json_encode($xml);
      }

错误控制台中没有错误，但没有收到任何值。它输出类似于array（0）{}的var_dump（$ _ POST）; 的修改我在成功函数后添加了一个测试警报并打印出失败

这是脚本

  <head>
  <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js">
  </script>
  </head>
  <body>
  <script type="text/javascript"> var msg_top = <?php echo searchResults('windows');?>;
  </script>
  <script type="text/javascript">
    $(document).ready(function() 
    {
       $.ajax({
       url: "script.php",
       type: "POST",
       dataType: "json",
       data: "msg_top",
       success: function(msg){
       alert("success");
     }
   });
   alert("failure");
  });
  </script>
  </body>
  </html>

这是来自twitter的json

    <script type="text/javascript"> var test_json = {\"id\":\"tag:search.twitter.com,2005:search\\/#DIYSe_F\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/search.twitter.com\\/search?q=%23DIYSe_F\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"application\\/atom+xml\",\"href\":\"http:\\/\\/search.twitter.com\\/search.atom?q=%23DIYSe_F&rpp=100\",\"rel\":\"self\"}},{\"@attributes\":{\"type\":\"application\\/opensearchdescription+xml\",\"href\":\"http:\\/\\/search.twitter.com\\/opensearch.xml\",\"rel\":\"search\"}},{\"@attributes\":{\"type\":\"application\\/atom+xml\",\"href\":\"http:\\/\\/search.twitter.com\\/search.atom?q=%23DIYSe_F&rpp=100&since_id=7750301532557312\",\"rel\":\"refresh\"}}],\"title\":\"#DIYSe_F - Twitter Search\",\"updated\":\"2010-11-24T22:20:44Z\",\"entry\":[{\"id\":\"tag:search.twitter.com,2005:7559269595488256\",\"published\":\"2010-11-24T22:20:44Z\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/twitter.com\\/_smir\\/statuses\\/7559269595488256\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"image\\/png\",\"href\":\"http:\\/\\/s.twimg.com\\/a\\/1289849896\\/images\\/default_profile_5_normal.png\",\"rel\":
    \":\"image\"}}],\"title\":\"#DIYse_F HIE_STRUCT: HIERARCHICAL STRUCTURE: hierarchical structure to display \\nmessages of Functions and Qualities types\",\"content\":\"<a href=\\\"http:\\/\\/search.twitter.com\\/search?q=%23DIYse_F\\\" onclick=\\\"pageTracker._setCustomVar(2, \'result_type\', \'recent\', 3);pageTracker._trackPageview(\'\\/intra\\/hashtag\\/#DIYse_F\');\\\"><b>#DIYse_F<\\/b><\\/a> HIE_STRUCT: HIERARCHICAL STRUCTURE: hierarchical structure to display \\nmessages of Functions and Qualities types\",\"updated\":\"2010-11-24T22:20:44Z\",\"author\":{\"name\":\"_smir (Smeer)\",\"uri\":\"http:\\/\\/twitter.com\\/_smir\"}},{\"id\":\"tag:search.twitter.com,2005:7552659368189952\",\"published\":\"2010-11-24T21:54:28Z\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/twitter.com\\/_smir\\/statuses\\/7552659368189952\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"image\\/png\",\"href\":\"http:\\/\\/s.twimg.com\\/a\\/1289849896\\/images\\/default_profile_5_normal.png\",\"rel\":\"image\"}}],\"title\":\"#DIYse_F SEND_MSG: users can send messages of four types i.e.  \\n\\nFunction,Quality,Solution, and delivery\",\"content\":\"<a href=\\\"http:\\/\\/search.twitter.com\\/search?q=%23DIYse_F\\\" onclick=\\\"pageTracker._setCustomVar(2, \'result_type\', \'recent\', 3);pageTracker._trackPageview(\'\\/intra
\\/hashtag\\/#DIYse_F\');\\\"><b>#DIYse_F<\\/b><\\/a> SEND_MSG: users can send messages of four types i.e.  \\n\\nFunction,Quality,Solution, and delivery\",\"updated\":\"2010-11-24T21:54:28Z\",\"author\":{\"name\":\"_smir (Smeer)\",\"uri\":\"http:\\/\\/twitter.com\\/_smir\"}},{\"id\":\"tag:search.twitter.com,2005:7548895705956352\",\"published\":\"2010-11-24T21:39:31Z\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/twitter.com\\/Babar_Shahzad\\/statuses\\/7548895705956352\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"image\\/png\",\"href\":\"http:\\/\\/a1.twimg.com\\/profile_images\\/1090185625\\/29465_391454998679_533808679_3864564_6071800_n_normal.jpg\",\"rel\":\"image\"}}],\"title\":\"#DIYse_F READ_MSG: Users can read messages of all four types in  \\n\\ndifferent windows\",\"content\":\"<a href=\\\"http:\\/\\/search.twitter.com\\/search?q=%23DIYse_F\\\" onclick=\\\"pageTracker._setCustomVar(2, \'result_type\', \'recent\', 3);pageTracker._trackPageview(\'\\/intra\\/hashtag\\/#DIYse_F\');\\\"><b>#DIYse_F<\\/b><\\/a> READ_MSG: Users can read messages of all four types in  \\n\\ndifferent windows\",\"updated\":\"2010-11-24T21:39:31Z\",\"author\":{\"name\":\"Babar_Shahzad (Babar Shahzad Ch)\",\"uri\":\"http:\\/\\/twitter.com\\/Babar_Shahzad\"}}]};

Answer 1

如果使用json_encode将数据编码为JSON，则输出将是有效的JavaScript表达式。所以你不需要把它放在引号中。

事实上，在其上应用addslashes会将有效的JavaScript表达式转换为包含该JavaScript表达式的字符串：

$json = json_encode(array('foo'=>'bar'));
var_export($json);  // '{"foo":"bar"}'
$string = addslashes($json);
var_export($str);   // '{\\"foo\\":\\"bar\\"}'

在JavaScript中使用这些值时，$json将包含有效的对象表达式，而$str将包含字符串表达式：

var json = <?php echo $json; ?>,
    str = "<?php echo $str; ?>";

这将成为：

var json = {"foo":"bar"},
    str = "{\"foo\":\"bar\"}";

所以只需使用json_encode而不应用任何进一步的编码/转义。在你的情况下（因为searchResults已经返回一个JSON字符串）：

var test_json = <?php echo searchResults('windows'); ?>;

Answer 2

如果searchResults函数尚未返回JSON，那么json_encode()会更容易，例如。

<script type="text/javascript"> 
    var msg_top = <?php echo json_encode(searchResults('windows'));?>;
</script>

如果searchResults函数已经返回正确的JSON，您应该只能直接分配输出，例如

<script type="text/javascript"> 
    var msg_top = <?php echo searchResults('windows');?>;
</script>

这个json对象从php到javascript的赋值有什么问题？

2 个答案: