小编Lil*_*yan的帖子

我正在使用Selenium用Javascript编写测试自动化.尝试提取DOM元素的类属性对我来说不起作用.这是我的代码:

var webdriver = require('selenium-webdriver');
var driver = new webdriver.Builder().
            withCapabilities(webdriver.Capabilities.ie()).
            build();
var usernameField = driver.findElement(webdriver.By.id('username'));
var classes = usernameField.getAttribute('class');
console.log(classes);

这打印出以下内容:

{ then: [Function: then],
cancel: [Function: cancel],
isPending: [Function: isPending] }

请说明如何查找元素的属性值.