jQuery AJAX 文件上传 PHP

您需要一个在服务器上运行的脚本来将文件移动到uploads目录.jQuery ajax方法(在浏览器的客户端上运行)将表单数据发送到服务器，然后服务器上运行的脚本处理上传.

您的HTML没有问题，但请将您的JS jQuery脚本更新为如下所示:

(在// <--后寻找 comments )

$('#upload').on('click', function() {
    var file_data = $('#sortpicture').prop('files')[0];   
    var form_data = new FormData();                  
    form_data.append('file', file_data);
    alert(form_data);                             
    $.ajax({
        url: 'upload.php', // <-- point to server-side PHP script 
        dataType: 'text',  // <-- what to expect back from the PHP script, if anything
        cache: false,
        contentType: false,
        processData: false,
        data: form_data,                         
        type: 'post',
        success: function(php_script_response){
            alert(php_script_response); // <-- display response from the PHP script, if any
        }
     });
});

现在是服务器端脚本，在本例中使用PHP.

upload.php:位于服务器上并在服务器上运行的PHP脚本，将文件定向到uploads目录:

<?php

    if ( 0 < $_FILES['file']['error'] ) {
        echo 'Error: ' . $_FILES['file']['error'] . '<br>';
    }
    else {
        move_uploaded_file($_FILES['file']['tmp_name'], 'uploads/' . $_FILES['file']['name']);
    }

?>

此外，还有关于目标目录的几件事:

1. 确保您有correct server path，即从PHP脚本位置开始上传目录的路径是什么，并且
2. 确定是writeable.

还有一点关于upload.php脚本中使用的PHP函数move_uploaded_file:

move_uploaded_file(

    // this is where the file is temporarily stored on the server when uploaded
    // do not change this
    $_FILES['file']['tmp_name'],

    // this is where you want to put the file and what you want to name it
    // in this case we are putting in a directory called "uploads"
    // and giving it the original filename
    'uploads/' . $_FILES['file']['name']
);

$_FILES['file']['name']是上传时的文件名.你不必用这个.您可以为文件指定任何名称(与服务器文件系统兼容):

move_uploaded_file(
    $_FILES['file']['tmp_name'],
    'uploads/my_new_filename.whatever'
);

最后，请注意PHPupload_max_filesize和post_max_size配置值，并确保测试文件不超过这两个值.这里有一些帮助，帮助你如何check PHP configuration和如何set max filesize and post settings.