As retailers gear up(ready to) for the traditional shop-fest known as Black Friday, they are focusing on the mobs(군중) that line up outside stores and—increasingly—on the masses that shop online from home.

Chain stores prefer impulse-purchaseprone(more likely to do st) store shoppers. Yet sales growth during the busy Thanksgiving weekend more often is coming from Internet shoppers like Melanie Cortese. Going to Woodbridge Center Mall with her mom on Black Friday was a family tradition for Ms. Cortese, a 37-year-old New Jersey mother of two. But no longer: she plans to go to bed on Thanksgiving night with a laptop nearby and wake up on Black Friday to shop online instead…

… Retailers can’t turn their back on shoppers who like to go to the stores. For example, Brookstone sells technology items that need salespeople to demonstrate the products and let shoppers play with them, said Chief Executive Stephen Bebis.

And while customers flock to the super-discounts, which for the retailers are often loss leaders, a lot of full-price selling also occurs on the day, retailers say. “It is one of our most profitable days,” said, Jim Kunihiro, chief marketing officer for Sears Holdings Corp. Like many retailers seeking to get the jump on(be better than competitor) their competitors, Sears is opening for the first time on Thanksgiving Day for a first round of door busters at 8 p.m., followed by another round of special discounts at 4 a.m. Friday.