child-nodes-cache.html - Android社区 - https://www.androidos.net.cn/

<body onload="test()">
<p>Running test...</p>
<textarea id=t rows=20>textarea</textarea>
<script>
if (window.layoutTestController) {
    layoutTestController.dumpAsText();
    layoutTestController.waitUntilDone();
}

function gc()
{
    if (window.GCController)
        return GCController.collect();

    for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
        var s = new String("abc");
    }
}

function test()
{
    var elem = document.getElementById("t");
    var nodes = document.getElementById("t").getAttributeNode('rows').childNodes;
    nodes[0]; // Prime the child node cache.
    document.body.removeChild(document.getElementById("t"));
    elem.getAttributeNode('rows').removeChild(nodes[0]);
    setTimeout(function() {
        gc();
        gc();
        gc();
        try { nodes[0].textContent } catch (ex) { }

        document.getElementsByTagName("p")[0].innerHTML = "PASS"
        if (window.layoutTestController)
            layoutTestController.notifyDone();
    }, 0);
}
</script>