Ajax请求什么都不返回。为什么？

进行jquery + ajax + PHP的最佳方法如下：

jQuery的：

<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js'></script><script type='text/javascript'>function do_ajax() { //set datavar myData = new Array();myData.push({name:’deletearray’,value:’deletearray’});myData.push({name:’dir’,value:’dir’});//ajax post$.ajax({ dataType: ’json’, url: ’delete.PHP’, type: ’post’, data: myData, success: function(returnData) {if(returnData.undeleted == 0) { alert(’All ’ + returnData.deleted + ’ files delted from the server’);} else { alert(returnData.deleted + ’ files deleted and ’ + returnData.undeleted + ’ files Could not be deleted’);} }});} </script>

PHP：

<?PHP $myData = $_POST; if(isset($myData[’deletearray’]) AND isset($myData[’dir’])) {$files = $myData[’deletearray’];$dir = $myData[’dir’];$deleted = 0;$undeleted = 0;foreach($files as $file) { if(unlink($dir.$file) && unlink($dir.’thumb/’.$file)) {$deleted ++; } else {$undeleted ++; }}print(json_encode(array(’deleted’ => $deleted, ’undeleted’ => $undeleted)));exit(); }?>解决方法

以下是ajax请求。

$.post(’delete.php’,{’deletearray’:deletearray,’dir’:dir},function(deleted,undeleted){ if(undeleted == 0) {alert(’All ’ + deleted + ’ files delted from the server’); } else {alert(deleted + ’ files deleted and ’ + undeleted + ’ files could not be deleted’); }},’json’);

这就是delete.php

<?php if(isset($_POST[’deletearray’])) {$files = $_POST[’deletearray’];$dir = $_POST[’dir’];$deleted = 0;$undeleted = 0;foreach($files as $file) { if(unlink($dir.$file) && unlink($dir.’thumb/’.$file)) {$deleted ++; } else {$undeleted ++; }}echo json_encode($deleted,$undeleted); } return;?>

运行代码后，它将成功删除文件，但不会显示任何消息。

我也尝试将ajax请求更改为：

$.post(’delete.php’,{deletearray:deletearray,dir:dir},undeleted){ alert('php finished'); },’json’);

仍然不显示该消息。所以我想在delete.php文件中出了点问题。请帮忙。