trtc_simple_demo_ios/web/js/index.js

function loadMainDartJs() {
    console.log(new Date());
    if (scriptLoaded) {
        return;
    }
    //hideSplash();
    scriptLoaded = true;
    var scriptTag = document.createElement("script");
    scriptTag.src = "main.dart.js?v=" + serviceWorkerVersion;
    scriptTag.type = "application/javascript";
    document.body.append(scriptTag);
}

///外部通知
function externalNotification(a, b) {
    window.invokeJs(a, b);
}

///打印pdf
function printPdfByBase64(base64) {
    printJS({
        printable: base64,
        type: 'pdf',
        base64: true
    })
}

function closeWindow(windowType) {
    var shell = window["FisShellApi"];
    if (shell) {
        shell.closeWindow(windowType);
    }
}

function getLanguageCode(callback) {
    var shell = window["FisShellApi"];
    if (shell) {
        var request = shell.getLanguageCode();
        request.then((v) =>
            callback(v)
        );
    }
}

function closeSlaveWindow() {
    var shell = window["FisShellApi"];
    if (shell) {
        shell.closeSlaveWindow();
    }
}

function beginWindowDrag(name) {
    var shell = window["FisShellApi"];
    if (shell) {
        shell.beginWindowDrag(name);
    }
}

function endWindowDrag(name) {
    var shell = window["FisShellApi"];
    if (shell) {
        shell.endWindowDrag(name);
    }
}

function closeWindow(name) {
    var shell = window["FisShellApi"];
    if (shell) {
        shell.closeWindow(name);
    }
}

function maximizeWindow(name) {
    var shell = window["FisShellApi"];
    if (shell) {
        shell.maximizeWindow(name);
    }
}

function minimizeWindow(name) {
    var shell = window["FisShellApi"];
    if (shell) {
        shell.minimizeWindow(name);
    }
}


function hideSplash() {
    console.log("onhide splash")
    var splash = document.getElementsByClassName("splash")[0];

    setTimeout(function () {
        splash.style.zIndex = 0;
    });
    var loading = document.getElementsByClassName("full-screen-center")[0];
    setTimeout(function () {
        loading.style.zIndex = 0;
    });

}

window.addEventListener("flutter-first-frame", function () {
    console.log("flutter-first-frame");
    hideSplash();
});

function loadService() {
    if ("serviceWorker" in navigator) {
        // Service workers are supported. Use them.
        window.addEventListener("load", function () {
            // Wait for registration to finish before dropping the <script> tag.
            // Otherwise, the browser will load the script multiple times,
            // potentially different versions.
            var serviceWorkerUrl =
                "flutter_service_worker.js?v=" + serviceWorkerVersion;
            navigator.serviceWorker.register(serviceWorkerUrl).then((reg) => {
                function waitForActivation(serviceWorker) {
                    serviceWorker.addEventListener("statechange", () => {
                        if (serviceWorker.state == "activated") {
                            console.log("Installed new service worker.");
                            loadMainDartJs();
                        }
                    });
                }
                if (!reg.active && (reg.installing || reg.waiting)) {
                    // No active web worker and we have installed or are installing
                    // one for the first time. Simply wait for it to activate.
                    waitForActivation(reg.installing || reg.waiting);
                } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
                    // When the app updates the serviceWorkerVersion changes, so we
                    // need to ask the service worker to update.
                    console.log("New service worker available.");
                    reg.update().then((data) => {
                        var worker = data.installing || data.waiting || data.active;
                        waitForActivation(worker);
                    });
                    // waitForActivation(reg.installing);
                } else {
                    // Existing service worker is still good.
                    console.log("Loading app from service worker.");
                    loadMainDartJs();
                }
            });

            // If service worker doesn't succeed in a reasonable amount of time,
            // fallback to plaint <script> tag.
            setTimeout(() => {
                if (!scriptLoaded) {
                    console.warn(
                        "Failed to load app from service worker. Falling back to plain <script> tag."
                    );
                    loadMainDartJs();
                }
            }, 4000);
        });
    } else {
        // Service workers not supported. Just drop the <script> tag.
        loadMainDartJs();
    }
}