如何将 .then 函数更改为 async/await 函数？

Question

我想用 .then 将此函数传递给 async / await 函数，但我找不到正确的方法。这是函数：

waitForCssClass = function(cssClass, waitTime) {
    var options = [],
    defer = protractor.promise.defer();
          
    browser.wait(function () {
            element.all(by.className(cssClass)).then(function (displayed) {
              options = displayed;
            }, waitTime);
            return options.length > 0;
          }, waitTime).then(function () {
            defer.fulfill(options);
    });
    
    return defer.promise;
};

Answer 1

waitForCssClass = async function(cssClass, waitTime) {
    return browser.wait(
        async () => await element.all(by.className(cssClass)).count() > 0,
        waitTime,
        'message on failure'
    );
};