Browser.execute为所有返回Undefined

Question

I am fetching few values from the Web Page using custom javascript in Nightwatch.

browser.execute(function () {
    priceValues = {
        total: document.querySelectorAll('someLocator').innerText,
        individualPrice: document.querySelectorAll('someLocator').innerText,
        discount: document.querySelectorAll('someLocator').innerText,
    };
    return priceValues;
}, [], function (result) {
    totalPrice = result.value.total;
    individual = result.value.individualPrice;
    discountPrice = result.value.discount;
});

The problem I am facing is that for some tests I don't have the discount so I am getting undefined there, but due to this the other two total and individualprice whose values are present are also getting undefined. It would be great if someone could point out where am I doing wrong.

Answer 1

I was able to do it with the below block of code:

browser.execute(function () {
    priceValues = {
        total: document.querySelectorAll('someLocator').innerText,
        individualPrice: document.querySelectorAll('someLocator').innerText,
    };
    var discount = document.querySelectorAll('someLocator'),

    if (discount && discount.innerText) {
        priceValues.discount = discount.innerText;
    }
    return priceValues;
}, [], function (result) {
    totalPrice = result.value.total;
    individual = result.value.individualPrice;
    discountPrice = result.value.discount;
});