readimage

已经看过的图片显示红框

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name        readimage
// @namespace   taoww
// @include	http://*
// @include	https://*
// @include	ftp://*
// @exclude     *://tieba.baidu.com/*
// @exclude     *://hi.baidu.com/*
// @exclude     *://blog.sina.com.cn/*
// @exclude     *://*.blog.sina.com.cn/*
// @exclude     *://www.51.la/*
// @exclude     *://bbs.aicbbs.com/*
// @version     1.1
// @description  已经看过的图片显示红框
// @grant       GM_addStyle
// ==/UserScript==

GM_addStyle("a img { border: 7px solid white; }");
GM_addStyle("a:visited img { border-color: red !important; }");

document.body.addEventListener("click", function(event) {
        var t = event.target;
        if (t.tagName === "IMG") {
                var link = null;
                if (t.parentNode.tagName === "A") {
                        link = t.parentNode;
 
               } else if (t.parentNode.tagName != "A" && 
t.parentNode.children.length === 1 && 
t.parentNode.parentNode.tagName === "A") {
                        link = t.parentNode.parentNode;
                }
                if (link && link.target !== "_blank" && link.href) {
                        var f = document.createElement("iframe");
                        f.style.display = "none";
                        f.src = link.href;
                        document.body.appendChild(f);
                }
        }
}, false);