getSize方法返回呈现的Web元素大小，而不是图像的物理大小。如果您的目标是获取固有的高度和重量，则可以尝试获取naturalWidth和naturalHeight属性：
WebDriver driver = new FirefoxDriver();
webdriverwait wait = new webdriverwait(driver, 20);
driver.get("http://stackoverflow.com");
// get the intrinsic size with the getAttribute method
WebElement ele = driver.findElement(By.cssSelector("img"));
String naturalWidth = ele.getAttribute("naturalWidth");
String naturalHeight = ele.getAttribute("naturalHeight");
// get the intrinsic size with a piece of Javascript
ArrayList result = (ArrayList)((JavascriptExecutor) driver).executeScript(
"return [arguments[0].naturalWidth, arguments[0].naturalHeight];", ele);
Long naturalWidth2 = (Long)result.get(0);
Long naturalHeight2 = (Long)result.get(1);
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