idempotent-update.html - Android社区 - https://www.androidos.net.cn/

<html manifest="resources/idempotent-update.manifest">
<body>
<p>Test what applicationCache.update() does if update is already in progess.</p>
<p>Should say DONE, with no failures:</p>
<div id=result></div>

<script>
if (window.layoutTestController) {
    layoutTestController.dumpAsText();
    layoutTestController.waitUntilDone();
}

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

function test()
{
    // During update, additional update() should be no-op (the spec says that fake checking and
    // downloading events need to be dispatched, but that's only when the update algorithm is invoked
    // with a browsing context).
    if (applicationCache.status != applicationCache.IDLE)
        log("FAIL: Unexpected cache status while preparing to test: " + applicationCache.status);
    
    var checkingCount = 0;
    applicationCache.onchecking = function() { if (++checkingCount != 1) log("FAIL: Too many checking events received.") }
    
    applicationCache.update();
    applicationCache.update();
    applicationCache.update();
    applicationCache.update();
    applicationCache.update();

    applicationCache.onnoupdate = done;
    applicationCache.oncached = function() { log("FAIL: received unexpected cached event") }
}

function done()
{
    setTimeout(function() {
        log("DONE");
        if (window.layoutTestController)
            layoutTestController.notifyDone();
    }, 10);
}

applicationCache.oncached = test;
applicationCache.onnoupdate = test;

applicationCache.onupdateready = function() { log("FAIL: received unexpected updateready event") }
applicationCache.onerror = function() { log("FAIL: received unexpected error event") }

</script>
</body>
</html>