function createFolder() {
        var clientContext = new SP.ClientContext.get_current();
        oWebsite = clientContext.get_web();
        oList = oWebsite.document().getByTitle("Shared Documents");
        var itemCreateInfo = new SP.ListItemCreationInformation();
        itemCreateInfo.set_underlyingObjectType(SP.FileSystemObjectType.folder);
        itemCreateInfo.set_leafName("My new folder!");
        oListItem = oList.addItem(itemCreateInfo);
        oListItem.set_item("Title", "My new folder!");
        oListItem.update();
        clientContext.load(oListItem);
        clientContext.executeQueryAsync(successHandler, errorHandler);
    }
    function successHandler() {
        alert("Go to the " +
            "<a href='../Lists/Shared Documents'>document library</a> " +
            "to see your new folder.");
    }
    function errorHandler() {
        alert("Request failed: " + arguments[1].get_message());          
    }

想知道Shared Documents表示的是什么，这个demo也是教程上的代码，为什么说找不到