Cyber Monday sales this year surged to new highs, with a record $7.9 billion spent online that day, an increase of 19.3 percent from a year ago, according to data from Adobe Analytics.

That's after Black Friday pulled in a record $6.22 billion in e-commerce sales, while sales online Thanksgiving Day totaled $3.7 billion.

Though foot traffic at some malls and stores was down over the holiday weekend, more and more shoppers have been turning to the internet to hunt for deals, and overall holiday sales are still expected to be up in 2018. Consumer confidence remains high, while unemployment is low in the U.S., giving many people the ability to spend more this year than last.

Spending on smartphones, meanwhile, continues to climb at a rapid clip, as companies like Macy's and Target have poured money into improving their mobile apps. And as bricks-and-mortar retail traffic continues to fall, some retailers are now trying to find ways to use their apps to lure shoppers back to stores, where sales are typically more profitable. Walmart, as one example, has added store maps to its app ahead of the holidays, letting customers pinpoint exactly where an item is and plot out their trips before they arrive.

Transactions on mobile devices were up 55.6 percent Cyber Monday from last year to reach $2.2 billion in sales, said Adobe, which tracks sales data from 80 of the top 100 internet retailers in the U.S., including Amazon and Walmart. More than half of shoppers' visits to retailers' websites Cyber Monday came from smartphones, with people making greater use of shipping options like buy online, pick up in store. So-called click-and-collect orders were up 65 percent this Cyber Monday from last year, Adobe said.