您可以执行一些JavaScript来查询DOM.具体来说，是 HTMLImageElement 的complete属性.. >

You could execute some javascript to interrogate the DOM. Specifically, the complete property of an HTMLImageElement.

public static void waitUntilVisible(WebDriver webDriver, By locator) {
    WebDriverWait driverWait = new WebDriverWait(webDriver, TIMEOUT);
    WebElement el = webDriver.findElement(locator);
    driverWait.until(
        new Predicate<WebDriver>() {
            public boolean apply(WebDriver driver) {
                return ((JavascriptExecutor)driver).executeScript("return arguments[0].complete", el);
            }
        }
    );
}

但是请注意，complete:

如果浏览器已完成获取操作，则返回一个布尔值，该布尔值为true 图像，无论是否成功.如果图像还显示为真 没有src值.

Returns a Boolean that is true if the browser has finished fetching the image, whether successful or not. It also shows true, if the image has no src value.