使用量角器从上下文菜单中选择一个选项

Question

尝试了几个选项但在打开上下文菜单后无法选择该选项。

.step('Performing Undo Operation', page.paragraph1.click(), function(){     
    browser.actions().click(protractor.Button.RIGHT).sendKeys(protractor.Key.ARROW_DOWN).sendKeys(protractor.Key.ENTER).perform().then(function() {
         console.log('Undo Done');
    })

    // Option 2               
    //browser.actions().click(protractor.Button.RIGHT).sendKeys(protractor.Key.chord("u",protractor.Key.ENTER)).perform();


    // Option 3
    // browser.actions().click(protractor.Button.RIGHT).perform();
    // browser.sleep(2000);
    //browser.actions().sendKeys(protractor.Key.ARROW_DOWN).sendKeys(protractor.Key.ENTER).perform();  
})