(Reuters) - China's JD.com Inc beat analysts' estimates for quarterly revenue on Friday, boosted by stronger sales in its core e-commerce business, sending its shares up nearly 7% before the bell.Internet companies JD.com and bigger rival Alibaba Group Holding Ltd are looking at other areas for diversification to deal with slowing growth in domestic e-commerce business, against the backdrop of the ongoing U.S.-China trade tensions.The company's total net revenue rose 28.7% to 134.8 billion..