isDisplayed
时间: 2024-08-12 14:07:36 浏览: 22
`isDisplayed()` 是一个在 web 开发中,特别是在前端自动化测试框架如 Selenium 或者 UI 测试工具中常用的方法。这个方法通常用于检查某个网页元素(如 HTML 元素、按钮、文本框等)是否可见并且位于浏览器视口内。如果元素是可见的并且不在滚动区域之外,那么 `isDisplayed()` 方法会返回 `true`,反之则返回 `false`。
例如,在使用 Selenium 进行 Web 自动化测试时,你可以这样写代码来检查某个元素:
```javascript
const element = driver.findElement(By.id('some-element'));
if (element.isDisplayed()) {
console.log('Element is displayed.');
} else {
console.log('Element is not displayed.');
}
```
相关问题
Design a Car class contains a stop data of bool type, which indicates whether the car moves or stops.The class has thefollowing operations: 1.isMovement:move a car. When the stop data is true, a "the car moves" string is displayed; otherwise "the car stops" isdisplayed. 2.Reset: reset the stop data by overloading operator ().Requirement: 1.The class must have a copy constructor. 2.Write a test program that declares two Car objects. One of two objects is declared by one existing object and test theoperations.
Sure, I understand your question. Here is the implementation of the Car class in C++:
```cpp
#include <iostream>
class Car {
public:
Car() : stop(true) {}
Car(const Car& car) {
stop = car.stop;
}
void operator() (bool value) {
stop = value;
}
void isMovement() {
if (stop) {
std::cout << "The car moves" << std::endl;
} else {
std::cout << "The car stops" << std::endl;
}
}
private:
bool stop;
};
int main() {
Car car1;
Car car2 = car1;
car1.isMovement();
car2.isMovement();
car1(false);
car1.isMovement();
car2.isMovement();
car2(true);
car1.isMovement();
car2.isMovement();
return 0;
}
```
This program creates two Car objects: car1 and car2. The copy constructor is used to create car2 from car1. The program then tests the isMovement method by calling it on both car1 and car2, which should display "The car stops" since the stop data is initialized to true. Then, the stop data is modified using the overloaded operator (), and isMovement is called again to test the change. Finally, the stop data of car2 is modified and isMovement is called again to show that the objects are independent.
Espresso测试示例代码:
Espresso是一个Android开发者工具,用于编写简洁、易于理解的UI测试。下面是一个简单的Espresso测试示例,它检查一个按钮是否可见并点击该按钮:
```java
import androidx.test.espresso.Espresso;
import androidx.test.espresso.ViewInteraction;
import androidx.appcompat.widget.AppCompatButton;
public class MainActivityTest {
@org.junit.Test
public void checkAndClickButton() {
// 找到屏幕上的按钮
ViewInteraction button = onView(withId(R.id.my_button));
// 确保按钮是可见的
assertVisible(button);
// 点击按钮
button.perform(click());
}
// 验证视图可见的方法
private void assertVisible(ViewInteraction view) {
try {
view.check(matches(isDisplayed()));
} catch (AssertionError e) {
throw new RuntimeException("Button is not visible", e);
}
}
}
```
在这个例子中,`onView(withId())`方法通过资源ID找到按钮,然后我们验证其是否显示(`matches(isDisplayed())`),如果不存在则抛出异常。接着,`perform(click())`方法模拟用户点击动作。
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