404-manifest.html - Android社区 - https://www.androidos.net.cn/

<html manifest="does-not-exist.manifest">
<script>
if (window.layoutTestController) {
    layoutTestController.dumpAsText()
    layoutTestController.waitUntilDone();
}

function log(message)
{
    document.getElementById("result").innerHTML += message + "<br>";
}

function unexpectedEvent(name)
{
    log("FAILURE: Unexpected " + name + " event.");
}

applicationCache.addEventListener('noupdate', function() { unexpectedEvent("noupdate") }, false);
applicationCache.addEventListener('downloading', function() { unexpectedEvent("downloading") }, false);
applicationCache.addEventListener('progress', function() { unexpectedEvent("progress") }, false);
applicationCache.addEventListener('updateready', function() { unexpectedEvent("updateready") }, false);
applicationCache.addEventListener('cached', function() { unexpectedEvent("cached") }, false);
applicationCache.addEventListener('obsolete', function() { unexpectedEvent("obsolete") }, false);

function test()
{
    if (!gotCheckingEvent)
        log("FAILURE: Did not get a checking event");
    if (window.applicationCache.status)
        log("FAILURE: Cache status is not UNCACHED, " + window.applicationCache.status);

    // The manifest failed to load, so there should be no cache, and subresources should be loaded normally.
    try {
        var req = new XMLHttpRequest();
        req.open("GET", "resources/simple.txt", false);
        req.send();

        if (req.responseText == 'Hello, World!')
            log("SUCCESS");
        else
            log("FAILURE: Did not get expected response data.");
    } catch (e) {
        log("FAILURE: Could not load data.");
    }

    if (window.layoutTestController)
        layoutTestController.notifyDone();
}

var gotCheckingEvent = false;
applicationCache.addEventListener('checking', function() { gotCheckingEvent = true; }, false);

applicationCache.addEventListener('error', function() { test() }, false);

</script>
<p>Test that subresources can be loaded if manifest is not available. Should say SUCCESS.</p>

<div id=result></div>
</html>