imglinks.js

// ==UserScript==
// @name        Load image links 2ch
// @include     https://2ch.*/*/res/*.html*
// @grant       GM_addStyle
// ==/UserScript==
var linkgrab = linkgrab || {};

linkgrab.file_ext = [".jpg", ".jpeg", ".png", ".mp4", ".gif", ".webm"];

linkgrab.checkFileExt = function(href) {
    for (var i = 0; i < linkgrab.file_ext.length; i++) {
        if (href.indexOf(linkgrab.file_ext[i]) !== -1) {
            return true;
        }
    }

    return false;
}

linkgrab.makeArrayOfHref = function() {
    var a = document.getElementsByClassName("post-wrapper");
    var str_links = new Array();

    for (var i = 0; i < a.length; i++) {
        if (a[i].childNodes[1].childNodes[1].childNodes[1].checked) {
            a[i].childNodes[1].childNodes[1].childNodes[1].checked = false;

            var pics = a[i].getElementsByTagName('a');

            for (var j = 0; j < pics.length; j++) {
                if (linkgrab.checkFileExt(pics[j].href) && !(str_links.indexOf(pics[j].href) > -1)) {
                    str_links.push(pics[j].href);
                }
            }
        }
    }

    return str_links;
}

linkgrab.textFile = null;
linkgrab.makeTextFile = function(text) {
    var data = new Blob([text], {
        type: 'text/plain'
    });

    // If we are replacing a previously generated file we need to
    // manually revoke the object URL to avoid memory leaks.
    if (linkgrab.textFile !== null) {
        window.URL.revokeObjectURL(textFile);
    }

    linkgrab.textFile = window.URL.createObjectURL(data);

    // returns a URL you can use as a href
    return linkgrab.textFile;
};

var a = document.createElement("a");
a.id = 'linkgrab_fileLink';
a.style = "display: none";
document.body.appendChild(a);


var zNode = document.createElement('div');
zNode.innerHTML = '<button id="linkgrab_myButton" type="button">Получить ссылки</button>';
document.body.appendChild(zNode);
document.getElementById("linkgrab_myButton").addEventListener("click", ButtonClickAction, false);

function ButtonClickAction(zEvent) {
    var str_links2 = linkgrab.makeArrayOfHref();

    if (str_links2.length === 0) {
        return;
    }

    //read text from textbox placed in parent window
    var text = str_links2.join("\n");

    var pathArray = window.location.pathname.split('/');

    var fileName = pathArray[1] + pathArray[3].split(".")[0];
    var url = linkgrab.makeTextFile(text);
    var a = document.getElementById("linkgrab_fileLink");
    a.href = url;
    a.download = fileName + ".txt";
    a.click();
    window.URL.revokeObjectURL(url);
}

//--- Style our newly added elements using CSS.
GM_addStyle(multilineStr(function() {
    /*!
        #linkgrab_myButton {
            cursor:                 pointer;
            position: fixed;
            right: 20px;
            top: 30px;
            opacity: 0.1;
        }
        
        #linkgrab_myButton:hover {
        opacity: 1;
        }
    */
}));

function multilineStr(dummyFunc) {
    var str = dummyFunc.toString();
    str = str.replace(/^[^\/]+\/\*!?/, '') // Strip function () { /*!
        .replace(/\s*\*\/\s*\}\s*$/, '') // Strip */ }
        .replace(/\/\/.+$/gm, '') // Double-slash comments wreck CSS. Strip them.
    ;
    return str;
}