将一个javascript变量与另一个页面的内容进行比较的Greasemonkey脚本？

Greasemonkey脚本是否可以将以下脚本的Name变量与另一个站点的成员列表进行比较，并在Name与任何人都不匹配的情况下使其运行脚本的其他部分？

//alert(Name);
var postHistory = "http://"+regionSlice+".targetforum.com/board/search.php?do=process&searchuser="+Name+"&exactname=1&showposts=1";
var avatar = "http://othersite.com/forum/avatar/" +regionSlice+ "." + Name + ".png"; // creates an avatar
// Replace the old Avatar
$('.user_icon', this).attr('src', avatar);
$('.user_icon', this).wrap('<a href="' + postHistory + '" class="link"></a>');
$('.user_icon', this).attr('width', '80');
$('.user_icon', this).attr('height', '80');
$('.user_icon', this).attr('style', 'position:relative; TOP:7px');

如果Name与任何记录都不匹配，那么这个代码将在下面的部分执行，这将是完美的。

var postHistory = "http://"+regionSlice+".targetforum.com/board/search.php?do=process&searchuser="+Name+"&exactname=1&showposts=1";
var avatar = "http://othersite.com/forum/avatar/" +regionSlice+ "." + Name + ".png"; // creates an avatar
var noAvatar = "http://other.com/forum/avatar/questionmark.png";
// Replace the old Avatar
$('.user_icon', this).attr('src', noAvatar);
$('.user_icon', this).wrap('<a href="' + postHistory + '" class="link"></a>');
$('.user_icon', this).attr('width', '80');
$('.user_icon', this).attr('height', '80');
$('.user_icon', this).attr('style', 'position:relative; TOP:7px');

othersite.com/forum/members.hp:上的成员列表

<?php
$con = mysql_connect("host","user","pass");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("database", $con);
$result = mysql_query("SELECT username FROM users ORDER BY ID");
echo "<table border='0'>
<tr>
<th>UserName</th>
</tr>";
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['username'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysql_close($con);
?>

下面是该页面的示例部分。该部分在一页中出现1到10次，因此Name将被检查1到10遍。"Vortexer"是Name的一个例子，下面的两行是user_icon。

<div id="edit4767039" style="padding:0px 0px 6px 0px">
<a name="4767039">&nbsp;</a>
<div class="forum_post post_frame" id="post4767039">
<div class="post_hidden_message">
Comment below rating threshold, click <a href="#">here</a> to show it.
</div>
<table>
<tr>
<td class="left" valign="top" id="currentPost">
<div class="avatar_top">
<div class="avatar" style="padding-top:10px;">
<big>Vortexer</big>
<a class="photo">
<img class="user_icon" src="theme/img/unknown_icon.jpg"/>
<span class="left_orb">??</span>
<span class="right_orb"><img src="http://irrelevantserver.com/forum/ui/avatar_right_orb_blue.png" alt=""/></span>
</a>
<small>Senior Member</small>
</div>
<center>
<a href="//articles/The_Code" target="_blank"><span class="sca_icon" style="align: center"><img src="http://irrelevantserver.com/images/community/community site/SCA_badge.png" alt="This user has accepted the code, click for more information"/></a></span>
</center>
</div>
</td>
<td class="right" valign="top">
<table class="right_table">
<tr>
<td>
<div class="message_header">
<!-- status icon and date -->
<span>1 Day Ago</span>
<!-- / status icon and date -->
</div>
<div class="post_content" id="post_message_4767039">
<p>This is forum post content</p>
</div>
<div class="message_footer">
<div class="r_block">
<span class="post_rating">
<span class="rating_positive">+3</span>
</span>
<a href="ratepost.php?postid=4767039&vote=-1" rel="nofollow" class="vote_down_button">
<img src="http://irrelevantserver.com/forum/ui/thumbs_down.png" alt=""/>
</a>
<a href="ratepost.php?postid=4767039&vote=1" rel="nofollow" class="vote_up_button">
<img src="http://irrelevantserver.com/forum/ui/thumbs_up.png" alt=""/>
</a>
<a href="newreply.php?do=newreply&amp;p=4767039" class="quick-reply" rel="nofollow"><img src="http://irrelevantserver.com/forum/ui/message_quote_icon.png" alt="Reply With Quote"/></a>
<a href="editpost.php?do=editpost&amp;p=4767039" name="vB::QuickEdit::4767039"><img src="http://irrelevantserver.com/forum/ui/edit_icon.png" alt="Edit/Delete Message" class="edit_button"/></a>
</div>
</div>
</td>
</tr>
</table>
</td>
</tr>
</table>
</div>
</div>

使用以下代码提取名称：

// Replace everypost's avatar
$('.forum_post').each(function(index) {
name = $('big', this).html();
//alert($('big', this).html());
var Name1 = name.replace("<font ", "");
var Name2 = Name1.replace("color="#c98f1a">", "");
var Name3 = Name2.replace("color="green">", "");
var Name4 = Name3.replace("color="red">", "");
var Name = Name4.replace("</font>", "");

是的，您可以将Name与从另一个网页抓取的内容进行比较。由于它看起来是跨域的，因此必须使用GM_xmlhttpRequest来执行此操作。

从members.php的外观来看，它返回一个如下表：

<table>
<tr><th>UserName</th></tr>
<tr><td>User A</td></tr>
<tr><td>User B</td></tr>
<tr><td>User C</td></tr>
<tr><td>User D</td></tr>
</table>

什么都没有
(如果确实返回了其他内容，则需要调整以下代码中的选择器。)
我在jsFiddle上制作了该HTML的模型。

如果你安装这个Greasemonkey脚本，你可以看到它读取用户名：

// ==UserScript==
// @name        _Parse simple AJAX page scrape/fetch
// @include     http://stackoverflow.com/*
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @grant       GM_xmlhttpRequest
// ==/UserScript==
GM_xmlhttpRequest ( {
method:     'GET',
url:        'http://fiddle.jshell.net/TDcDV/show/',
onload:     getUsernamesFromAjax
} );
function getUsernamesFromAjax (respObject) {
var respDoc     = $(respObject.responseText);
var userNameTDs = respDoc.find ("td");
var userNames   = userNameTDs.map ( function () {
return this.textContent;
} ).get ();
alert ("The usernames are: " + userNames);
}

(警报，"The usernames are: User A,User B,User C,User D"。)

现在，关于Name与数据的比较，问题还不清楚。

Name来自哪里
是否存在多个Name值？如果是，哪个.user_icon节点与哪个Name相关

链接或粘贴到整个页面。

更新：
根据新信息，以下是您希望脚本执行的操作：

将头像替换为"进行中"图像("悸动器")，让用户知道我们正在等待AJAX结果
(AJAX可能需要几秒钟。)
向成员列表的外部网站启动AJAX请求。
当AJAX返回成员列表时：
1. 对于成员列表中的名称，请替换其头像
2. 对于不在成员列表中的姓名，请将其头像替换为"无头像"图像

这里有一个完整的脚本
安装脚本，然后访问jsbin.com/awaxap/1，查看它的运行情况

// ==UserScript==
// @name      _Replace avatars for matching names
// @include   http://jsbin.com/awaxap/*
// @include   http://YOUR_SERVER.COM/YOUR_PATH/*
// @require   http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @resource  waitImg  http://i.cdn.turner.com/money/.element/img/1.0/misc/throbber.gif
// @grant     GM_xmlhttpRequest
// @grant     GM_getResourceURL
// ==/UserScript==
//--- Replace avatars with an "In progress" image.
var waitImgSrc  = GM_getResourceURL ("waitImg");
$("div.forum_post div.avatar img.user_icon").attr ('src',  waitImgSrc);

//--- Fetch the member list.
GM_xmlhttpRequest ( {
method:     'GET',
url:        'http://fiddle.jshell.net/TDcDV/show/',
onload:     changeUserIconsOfMembers
} );

//--- Replace avatars based on name match.
function changeUserIconsOfMembers (respObject) {
var respDoc     = $(respObject.responseText);
var userNameTDs = respDoc.find ("td");
var userNames   = userNameTDs.map ( function () {
return $.trim (this.textContent.toLowerCase () );
} ).get ();
//--- Replace every post's avatar.
$('div.forum_post').each ( function (index) {
//-- text() automatically strips out any <font> cruft, if present.
var Name        = $('div.avatar big', this). text ();
//-- Standardize name for comparison.
Name            = $.trim (Name).toLowerCase ();
var regionSlice = "";   // where's this come from?
var postHistory = "http://" + regionSlice
+ ".targetforum.com/board/search.php?do=process&searchuser="
+ Name + "&exactname=1&showposts=1"
;
var avatar      = "http://othersite.com/forum/avatar/" + regionSlice
+ "." + Name + ".png"
; // creates an avatar
avatar  = "https://i.stack.imgur.com/Nrzn7.jpg"; // Temp avatar upgrade. ;)
//--- Was the username not found?
if (userNames.indexOf (Name) === -1 ) {
avatar      = "http://other.com/forum/avatar/questionmark.png";
avatar  = "https://i.stack.imgur.com/BbOsC.gif"; // Temp avatar upgrade. ;)
}
//--- Replace the old Avatar and give it a link to history.
var userIcon    = $('div.avatar img.user_icon', this);
userIcon.attr ( {
src:        avatar,
width:      '80',
height:     '80',
style:      'position:relative; TOP:7px;'
} );
userIcon.wrap ('<a href="' + postHistory + '" class="link"></a>');
} );
}

请注意，未找到用户"Vortexer"，但找到了"用户B"。

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