云缴费平台双十二促销活动

// 使用异步加载JavaScript文件
function loadScript(url, callback) {
    var script = document.createElement("script");
    script.type = "text/javascript";
    if (script.readyState) {  // IE
        script.onreadystatechange = function () {
            if (script.readyState == "loaded" || script.readyState == "complete") {
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {  // Others
        script.onload = function () {
            callback();
        };
    }
    script.src = url;
    document.getElementsByTagName("head")[0].appendChild(script);
}

// 异步加载多个脚本
loadScript("https://example.com/script1.js", function () {
    loadScript("https://example.com/script2.js", function () {
        console.log("All scripts loaded!");
    });
});