我正在尝试使用在 Javascript 文件中的单独 php 文件中声明的 php 函数。你知道该怎么做吗？这是我的 PHP 代码（download.php）：
<?php
$passthru = function ($reqchain)
{
$reqchain = $_SERVER['QUERY_STRING']; //chaîne de requête (partie de l'URL après le ?) qui sert à se connecter à la page (ex: file=C:/xampp/htdocs/projet/siteAM.PNG)
$path = substr($reqchain, 5);
// $fullpath = $dir.$_GET[$file];
header('Content-Type: '.mime_content_type($path));
header('Content-Length: '.filesize($path));
header('Content-Transfer-Encoding: Binary');
header('Content-Disposition: inline; filename="'.basename($reqchain).'"');
fpassthru(fopen($path, 'rb'));
}
?>
这是我的 Javascript 代码（script.js）（我写了一个大注释来标记我尝试调用我的函数的位置，它接近代码的结尾）：
$(function(){
var filemanager = $('.filemanager'),
breadcrumbs = $('.breadcrumbs'),
fileList = filemanager.find('.data');
// Start by fetching the file data from scan.php with an AJAX request
$.get('scan.php', 'download.php', function(data) {
var response = [data],
currentPath = '',
breadcrumbsUrls = [];
var folders = [],
files = [];
// This event listener monitors changes on the URL. We use it to
// capture back/forward navigation in the browser.
$(window).on('hashchange', function(){
goto(window.location.hash);
// We are triggering the event. This will execute
// this function on page load, so that we show the correct folder:
}).trigger('hashchange');
// Hiding and showing the search box
filemanager.find('.search').click(function(){
var search = $(this);
search.find('span').hide();
search.find('input[type=search]').show().focus();
});
// Listening for keyboard input on the search field.
// We are using the "input" event which detects cut and paste
// in addition to keyboard input.
filemanager.find('input').on('input', function(e){
folders = [];
files = [];
var value = this.value.trim();
if(value.length) {
filemanager.addClass('searching');
// Update the hash on every key stroke
window.location.hash = 'search=' + value.trim();
}
else {
filemanager.removeClass('searching');
window.location.hash = encodeURIComponent(currentPath);
}
}).on('keyup', function(e){
// Clicking 'ESC' button triggers focusout and cancels the search
var search = $(this);
if(e.keyCode == 27) {
search.trigger('focusout');
}
}).focusout(function(e){
// Cancel the search
var search = $(this);
if(!search.val().trim().length) {
window.location.hash = encodeURIComponent(currentPath);
search.hide();
search.parent().find('span').show();
}
});
// Clicking on folders
fileList.on('click', 'li.folders', function(e){
e.preventDefault();
var nextDir = $(this).find('a.folders').attr('href');
if(filemanager.hasClass('searching')) {
// Building the breadcrumbs
breadcrumbsUrls = generateBreadcrumbs(nextDir);
filemanager.removeClass('searching');
filemanager.find('input[type=search]').val('').hide();
filemanager.find('span').show();
}
else {
breadcrumbsUrls.push(nextDir);
}
window.location.hash = encodeURIComponent(nextDir);
currentPath = nextDir;
});
// Clicking on breadcrumbs
breadcrumbs.on('click', 'a', function(e){
e.preventDefault();
var index = breadcrumbs.find('a').index($(this)),
nextDir = breadcrumbsUrls[index];
breadcrumbsUrls.length = Number(index);
window.location.hash = encodeURIComponent(nextDir);
});
// Navigates to the given hash (path)
function goto(hash) {
hash = decodeURIComponent(hash).slice(1).split('=');
if (hash.length) {
var rendered = '';
// if hash has search in it
if (hash[0] === 'search') {
filemanager.addClass('searching');
rendered = searchData(response, hash[1].toLowerCase());
if (rendered.length) {
currentPath = hash[0];
render(rendered);
}
else {
render(rendered);
}
}
// if hash is some path
else if (hash[0].trim().length) {
rendered = searchByPath(hash[0]);
if (rendered.length) {
currentPath = hash[0];
breadcrumbsUrls = generateBreadcrumbs(hash[0]);
render(rendered);
}
else {
currentPath = hash[0];
breadcrumbsUrls = generateBreadcrumbs(hash[0]);
render(rendered);
}
}
// if there is no hash
else {
currentPath = data.path;
breadcrumbsUrls.push(data.path);
render(searchByPath(data.path));
}
}
}
// Splits a file path and turns it into clickable breadcrumbs
function generateBreadcrumbs(nextDir){
var path = nextDir.split('/').slice(0);
for(var i=1;i<path.length;i++){
path[i] = path[i-1]+ '/' +path[i];
}
return path;
}
// Locates a file by path
function searchByPath(dir) {
var path = dir.split('/'),
demo = response,
flag = 0;
for(var i=0;i<path.length;i++){
for(var j=0;j<demo.length;j++){
if(demo[j].name === path[i]){
flag = 1;
demo = demo[j].items;
break;
}
}
}
demo = flag ? demo : [];
return demo;
}
// Recursively search through the file tree
function searchData(data, searchTerms) {
data.forEach(function(d){
if(d.type === 'folder') {
searchData(d.items,searchTerms);
if(d.name.toLowerCase().match(searchTerms)) {
folders.push(d);
}
}
else if(d.type === 'file') {
if(d.name.toLowerCase().match(searchTerms)) {
files.push(d);
}
}
});
return {folders: folders, files: files};
}
// Render the HTML for the file manager
function render(data) {
var scannedFolders = [],
scannedFiles = [];
if(Array.isArray(data)) {
data.forEach(function (d) {
if (d.type === 'folder') {
scannedFolders.push(d);
}
else if (d.type === 'file') {
scannedFiles.push(d);
}
});
}
else if(typeof data === 'object') {
scannedFolders = data.folders;
scannedFiles = data.files;
}
// Empty the old result and make the new one
fileList.empty().hide();
if(!scannedFolders.length && !scannedFiles.length) {
filemanager.find('.nothingfound').show();
}
else {
filemanager.find('.nothingfound').hide();
}
if(scannedFolders.length) {
scannedFolders.forEach(function(f) {
var itemsLength = f.items.length,
name = escapeHTML(f.name),
icon = '<span class="icon folder"></span>';
if(itemsLength) {
icon = '<span class="icon folder full"></span>';
}
if(itemsLength == 1) {
itemsLength += ' item';
}
else if(itemsLength > 1) {
itemsLength += ' items';
}
else {
itemsLength = 'Empty';
}
var folder = $('<li class="folders"><a href="'+ f.path +'" title="'+ f.path +'" class="folders">'+icon+'<span class="name">' + name + '</span> <span class="details">' + itemsLength + '</span></a></li>');
folder.appendTo(fileList);
});
}
if(scannedFiles.length) {
scannedFiles.forEach(function(f) {
var fileSize = bytesToSize(f.size),
name = escapeHTML(f.name),
fileType = name.split('.'),
icon = '<span class="icon file"></span>';
fileType = fileType[fileType.length-1];
icon = '<span class="icon file f-'+fileType+'">.'+fileType+'</span>';
var file = $('<li class="files"><a href="download.php?file='+ f.path+'" title="'+ f.path +'" class="files">'+icon+'<span class="name">'+ name +'</span> <span class="details">'+fileSize+'</span></a></li>');
file.appendTo(fileList);
/* //////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////// HERE IS WHERE I TRY TO CALL MY FUNCTION /////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////// */
$passthru($_SERVER['QUERY_STRING']);
/* /////////////////////^^//////////////////////////////////////////////^^///////////////////////////
|| ||
//////////////////// || HERE IS WHERE I TRY TO CALL MY FUNCTION || /////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////// */
});
}
// Generate the breadcrumbs
var url = '';
if(filemanager.hasClass('searching')){
url = '<span>Résultat de la recherche: </span>';
fileList.removeClass('animated');
}
else {
fileList.addClass('animated');
breadcrumbsUrls.forEach(function (u, i) {
var name = u.split('/');
if (i !== breadcrumbsUrls.length - 1) {
url += '<a href="'+u+'"><span class="folderName">' + name[name.length-1] + '</span></a> <span class="arrow">→</span> ';
}
else {
url += '<span class="folderName">' + name[name.length-1] + '</span>';
}
});
}
breadcrumbs.text('').append(url);
// Show the generated elements
fileList.animate({'display':'inline-block'});
}
// This function escapes special html characters in names
function escapeHTML(text) {
return text.replace(/\&/g,'&').replace(/\</g,'<').replace(/\>/g,'>');
}
// Convert file sizes from bytes to human readable units
function bytesToSize(bytes) {
var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
if (bytes == 0) return '0 Bytes';
var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
}
});
});