checkJQuery

Check jQuery.

Ezt a szkriptet nem ajánlott közvetlenül telepíteni. Ez egy könyvtár más szkriptek számára, amik tartalmazzák a // @require https://update.greasyfork.org/scripts/417760/876220/checkJQuery.js hivatkozást.

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        checkJQuery 
// @namespace   http://www.ocrosoft.com/
// @version     0.100
// @description Check jQuery.
// @author      ocrosoft
// @grant       unsafeWindow
// ==/UserScript==

// jQuery
var checkJQuery = function() {
    let jqueryCdns = [
        'http://code.jquery.com/jquery-2.1.4.min.js',
        'http://libs.baidu.com/jquery/2.1.4/jquery.min.js',
        'http://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.1.4.min.js',
        // 可能抽风,多试几次
        'http://code.jquery.com/jquery-2.1.4.min.js',
        'http://libs.baidu.com/jquery/2.1.4/jquery.min.js',
        'http://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.1.4.min.js',
    ];
    function isJQueryValid() {
        try {
            let wd = unsafeWindow;
            if (wd.jQuery && !wd.$) {
                wd.$ = wd.jQuery;
            }
            $();
            return true;
        } catch (exception) {
            return false;
        }
    }
    function insertJQuery(url) {
        let script = document.createElement('script');
        script.src = url;
        document.head.appendChild(script);
        return script;
    }
    function converProtocolIfNeeded(url) {
        let isHttps = location.href.indexOf('https://') != -1;
        let urlIsHttps = url.indexOf('https://') != -1;

        if (isHttps && !urlIsHttps) {
            return url.replace('http://', 'https://');
        } else if (!isHttps && urlIsHttps) {
            return url.replace('https://', 'http://');
        }
        return url;
    }
    function waitAndCheckJQuery(cdnIndex, resolve) {
        if (cdnIndex >= jqueryCdns.length) {
            iLog.e('无法加载 JQuery,正在退出。');
            resolve(false);
            return;
        }
        let url = converProtocolIfNeeded(jqueryCdns[cdnIndex]);
        iLog.i('尝试第 ' + (cdnIndex + 1) + ' 个 JQuery CDN:' + url + '。');
        let script = insertJQuery(url);
        setTimeout(function() {
            if (isJQueryValid()) {
                iLog.i('已加载 JQuery。');
                resolve(true);
            } else {
                iLog.w('无法访问。');
                script.remove();
                waitAndCheckJQuery(cdnIndex + 1, resolve);
            }
        }, 100);
    }
    return new Promise(function(resolve) {
        if (isJQueryValid()) {
            iLog.i('已加载 jQuery。');
            resolve(true);
        } else {
            iLog.i('未发现 JQuery,尝试加载。');
            waitAndCheckJQuery(0, resolve);
        }
    });
}