问wicket 6:页面加载后调用javascript函数

EN

window.onload = function () {
// do stuff here
}

@Override
public void renderHead(IHeaderResponse response)
{
    super.renderHead(response);
    String bar = "something";
    response.render(JavaScriptHeaderItem.forScript("window.onload = function () {var foo='" + bar + "'}"));
    // or
    response.render(OnDomReadyHeaderItem.forScript("functionToCall(" + bar + ");") ;
}

AjaxEventBehavior event = new AjaxEventBehavior("onload") {
    @Override
    protected void onEvent(final AjaxRequestTarget target) {
        // do stuff here
        target.appendJavaScript("alert('onload');");
    }
}
add(event);