| window.onload = function() {
var sl = new SocialHistory(); alert(sl.doesVisit("www.glzy8.com")); } 如果用户曾经使用过www.glzy8.com，那么该函数就会返回真，否则返回假。 其实原理并不复杂，它利用了链接的 a:visited 伪类的属性。首先在页面上生成一个iframe，并在这个iframe中设置 a 和 a:visited 为不同的样式。然后将网站的链接插入到 iframe 中。浏览器就会根据用户的访问历史，为访问过的链接设置 a:visited 的样式。最后再获得链接的最终样式，如果是 a:visited，就可以认为用户访问过该网站了。具体的实现方式可以参考源代码。 这个脚本主要用于显示社会性书签的图标，可以恰到好处地显示用户所使用的网站。但我担心，这样的做法是不是有盗取用户隐私之嫌？虽然这个方法只能判断用户有无访问特定的网站，并不能无限制地得到所有访问历史。 /*
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| * Social Limit - Only the social you care about.
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| *
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| * Enables your site to know which social bookmarking badges to display to your
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| * visitors. It tells you all social sites the user has gone to, or you can
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| * query for a specific one.
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| *
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| * For example:
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| *
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| * var sl = SocialHistory();
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| * alert( sl.doesVisit("Digg") ); // Returns true/false, -1 if unknown.
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| * var listOfVisitedSites = sl.visitedSites();
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| * var checkedSites = sl.checkedSites();
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| *
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| * If you want to add more sites to check, you can pass that in as a dictionary
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| * to History:
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| *
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| * var more = { "Humanized": "http://humanized.com",
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| * "Azarask.in": ["http://azarask.in", "http://azarask.in/blog"]
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| * };
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| * var sl = SocialHistory(more);
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| * alert( sl.doesVisit("Humanized") );
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| *
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| * For a list of built-in sites, see the sites variable below.
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| *
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| * Copyright (c) 2008 Aza Raskin (http://azarask.in/blog)
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| *
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| * Permission is hereby granted, free of charge, to any person obtaining a copy
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| * of this software and associated documentation files (the "Software"), to deal
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| * in the Software without restriction, including without limitation the rights
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| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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| * copies of the Software, and to permit persons to whom the Software is
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| * furnished to do so, subject to the following conditions:
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| *
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| * The above copyright notice and this permission notice shall be included in
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| * all copies or substantial portions of the Software.
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| *
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| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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| * THE SOFTWARE.
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| *
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| */
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|
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| var SocialHistory = function( moreSites ){
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|
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| var sites = {
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| "Digg": ["http://digg.com", "http://digg.com/login"],
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| "Reddit": ["http://reddit.com", "http://reddit.com/new/", "http://reddit.com/controversial/", "http://reddit.com/top/", "http://reddit.com/r/reddit.com/", "http://reddit.com/r/programming/"],
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| "StumbleUpon": ["http://stumbleupon.com"],
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| "Yahoo Buzz": ["http://buzz.yahoo.com"],
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| "Facebook": ["http://facebook.com/home.php", "http://facebook.com", "https://login.facebook.com/login.php"],
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| "Del.icio.us": ["https://secure.del.icio.us/login", "http://del.icio.us/"],
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| "MySpace": ["http://www.myspace.com/"],
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| "Technorati": ["http://www.technorati.com"],
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| "Newsvine": ["https://www.newsvine.com", "https://www.newsvine.com/_tools/user/login"],
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| "Songza": ["http://songza.com"],
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| "Slashdot": ["http://slashdot.org/"],
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| "Ma.gnolia": ["http://ma.gnolia.com/"],
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| "Blinklist": ["http://www.blinklist.com"],
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| "Furl": ["http://furl.net", "http://furl.net/members/login"],
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| "Mister Wong": ["http://www.mister-wong.com"],
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| "Current": ["http://current.com", "http://current.com/login.html"],
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| "Menaeme": ["http://meneame.net", "http://meneame.net/login.php"],
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| "Oknotizie": ["http://oknotizie.alice.it", "http://oknotizie.alice.it/login.html.php"],
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| "Diigo": ["http://www.diigo.com/", "https://secure.diigo.com/sign-in"],
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| "Funp": ["http://funp.com", "http://funp.com/account/loginpage.php"],
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| "Blogmarks": ["http://blogmarks.net"],
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| "Yahoo Bookmarks": ["http://bookmarks.yahoo.com"],
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| "Xanga": ["http://xanga.com"],
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| "Blogger": ["http://blogger.com"],
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| "Last.fm": ["http://www.last.fm/", "https://www.last.fm/login/"],
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| "N4G": ["http://www.n4g.com"],
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| "Faves": ["http://faves.com", "http://faves.com/home", "https://secure.faves.com/signIn"],
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| "Simpy": ["http://www.simpy.com", "http://www.simpy.com/login"],
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| "Yigg": ["http://www.yigg.de"],
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| "Kirtsy": ["http://www.kirtsy.com", "http://www.kirtsy.com/login.php"],
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| "Fark": ["http://www.fark.com", "http://cgi.fark.com/cgi/fark/users.pl?self=1"],
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| "Mixx": ["https://www.mixx.com/login/dual", "http://www.mixx.com"],
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| "Google Bookmarks": ["http://www.google.com/bookmarks", "http://www.google.com/ig/add?moduleurl=bookmarks.xml&hl=en"],
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| "Subbmitt": ["http://subbmitt.com/"]
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| };
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|
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| for( var site in moreSites ) {
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| // If we don't have the site, create the URL list.
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| if( typeof( sites[site] ) == "undefined" ) sites[site] = [];
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|
|
| // If the value is string, just push that onto the URL list.
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| if( typeof( moreSites[site] ) == "string" )
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| sites[site].push( moreSites[site] );
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| else
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| sites[site] = sites[site].concat( moreSites[site] );
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| }
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|
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| var visited = {};
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|
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| function getStyle(el, scopeDoc,styleProp) {
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| if (el.currentStyle)
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| var y = el.currentStyle[styleProp];
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| else if (window.getComputedStyle)
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| var y = scopeDoc.defaultView.getComputedStyle(el,null).getPropertyValue(styleProp);
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| return y;
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| }
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|
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| function remove( el ) {
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| el.parentNode.removeChild( el );
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| }
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|
|
| // Code inspired by:
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| // bindzus.wordpress.com/2007/12/24/adding-dynamic-contents-to-iframes
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| function createIframe() {
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| var iframe = document.createElement("iframe");
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| iframe.style.position = "absolute";
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| iframe.style.visibility = "hidden";
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|
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| document.body.appendChild(iframe);
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|
|
| // Firefox, Opera
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| if(iframe.contentDocument) iframe.doc = iframe.contentDocument;
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| // Internet Explorer
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| else if(iframe.contentWindow) iframe.doc = iframe.contentWindow.document;
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|
|
| // Magic: Force creation of the body (which is null by default in IE).
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| // Also force the styles of visited/not-visted links.
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| iframe.doc.open();
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| iframe.doc.write('<style>');
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| iframe.doc.write("a{color: #000000; display:none;}");
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| iframe.doc.write("a:visited {color: #FF0000; display:inline;}");
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| iframe.doc.write('</style>');
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| iframe.doc.close();
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|
|
| // Return the iframe: iframe.doc contains the iframe.
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| return iframe;
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| }
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|
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| var iframe = createIframe();
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|
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| function embedLinkInIframe( href, text ) {
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| var a = iframe.doc.createElement("a");
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| a.href = href;
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| a.innerHTML = site;
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| iframe.doc.body.appendChild( a );
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| }
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|
|
| for( var site in sites ) {
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| var urls = sites[site];
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| for( var i=0; i<urls.length; i++ ) {
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| // You have to create elements in the scope of the iframe for IE.
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| embedLinkInIframe( urls[i], site );
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|
|
| // Automatically try variations of the URLS with and without the "www"
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| if( urls[i].match(/www\./) ){
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| var sansWWW = urls[i].replace(/www\./, "");
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| embedLinkInIframe( sansWWW, site );
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| } else {
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| // 2 = 1 for length of string + 1 for slice offset
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| var httpLen = urls[i].indexOf("//") + 2;
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| var withWWW = urls[i].substring(0, httpLen ) + "www." + urls[i].substring( httpLen );
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| embedLinkInIframe( withWWW, site );
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| }
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|
|
| }
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| }
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|
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| var links = iframe.doc.body.childNodes;
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| for( var i=0; i<links.length; i++) {
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| // Handle both Firefox/Safari, and IE (respectively)
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| var displayValue = getStyle(links[i], iframe.doc, "display");
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| var didVisit = displayValue != "none";
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|
|
| if( didVisit ){ |
| visited[ links[i].innerHTML ] = true; |
| } |
| } |
| remove( iframe ); |
|
|
| return new (function(){ |
| var usedSites = []; |
| for( var site in visited ){ |
| usedSites.push( site ); |
| } |
|
|
| // Return an array of visited sites.
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| this.visitedSites = function() {
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| return usedSites;
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| }
|
|
|
| // Return true/false. If we didn't check the site, return -1.
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| this.doesVisit = function( site ) {
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| if( typeof( sites[site] ) == "undefined" )
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| return -1;
|
| return typeof( visited[site] ) != "undefined";
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| }
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|
|
| var checkedSites = [];
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| for( var site in sites ){
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| checkedSites.push( site );
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| }
|
| // Return a list of the sites checked.
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| this.checkedSites = function(){
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| return checkedSites;
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| }
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| })();
|
| } |