Collect small tv in bilibili automatically

auto_collect.js

// to use this script, you should allow popups on live.bilibili.com.
function collect(url, times, w, cb) {
    var img = w.document.querySelector(".small-tv-draw").querySelector(".draw-img");
    if (img.length == 0) {
        console.error("page " + url + " not loaded, there should be a bug.");
        w.close();
        cb();
    } else {
        img.click();
        console.info(url + " is collected");
        setTimeout(function() {
            w.close();
            cb();
        }, 500);
    }
};

function collectLoop(tvUrls) {
    if (tvUrls.length == 0) {
        setTimeout(function() { collectLoop(tvUrls) }, 1000);
        return;
    }
    var url = tvUrls.shift();
    var w = window.open(url, "_blank");
    $(w).load(function() {
        collect(url, 1, w, function() {
            collectLoop(tvUrls);
        });
    });
}

function mutationHandlerFactory() {
    var tvUrls = [];
    collectLoop(tvUrls);
    return function(mutationRecords) {
        mutationRecords.forEach(function(mutation) {
            if (mutation.type == "childList") {
                mutation.addedNodes.forEach(function(node) {
                    var link = $(node).find(".small-tv-msg a");
                    if (link.length) {
                        let url = link.attr("href");
                        console.info("collecting: ", url);
                        tvUrls[tvUrls.length] = url;
                    }
                })
            }
        });
    };
}
var elemt = document.getElementById("chat-msg-list");
var obsConfig = {
    childList: true,
    characterData: false,
    attributes: false,
    subtree: false
};
var observer = new MutationObserver(mutationHandlerFactory());
observer.observe(elemt, obsConfig);