这在使用selenium自动测试中是一个相当常见的问题。
可能的原因以及解决办法有几种：
1.make sure the element you want to click is actually visible. Sometimes you need to make extra actions on a page to make the element visible. For example, open up a dropdown for an option to appear or open menu for submenu to appear
2.wait for the visibility of the element:
var EC = protractor.ExpectedConditions;
var mumbaiCity = element(by.id('mumbaiCity'));
browser.wait(EC.visibilityOf(mumbaiCity), 5000);
mumbaiCity.click();
3.there is an another element with the same id that is actually invisible. In this case, you need to improve your locator to match this specific element. For instance:
element(by.css(".city-checkbox #mumbaiCity")).click();
element(by.css(".city-checkbox input[ng-click*=Mumbai]")).click();
4.Or, if you got multiple elements matching the same locator - you can "filter" out a visible element:
var mumbaiCity = element.all(by.id('mumbaiCity')).filter(function (elm) {
return elm.isDisplayed().then(function (isDisplayed) {
return isDisplayed;
});
}).first();
mumbaiCity.click();
5.move to element and then click via browser.actions():
var mumbaiCity = element(by.id('mumbaiCity'));
browser.actions().mouseMove(mumbaiCity).click().perform();
6.scroll into view of the element and then click:
var mumbaiCity = element(by.id('mumbaiCity'));
browser.executeScript("arguments[0].scrollIntoView();", mumbaiCity.getWebElement());
mumbaiCity.click();
7.click via javascript (beware of the differences though):
var mumbaiCity = element(by.id('mumbaiCity'));
browser.executeScript("arguments[0].click();", mumbaiCity.getWebElement());
8.sometimes, you just need to maximize the browser window:
browser.driver.manage().window().maximize();
参考自：stackoverflow
