尝试这样：
String mainWindow = driver.getWindowHandle();
Set<String> windows= driver.getWindowHandles();
if (windows.size() > 1) {
//first remove main window
windows.remove(mainWindow);
//switching to new/child window and perform some action on new window if required. Then close it.
driver.switchTo().window(windows.iterator().next());
driver.close();
//switching back to mainWindow, Then continue with your actions.
driver.switchTo().window(mainWindow);
windows.clear();
}
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