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The last parameter is compatible through the getEventTarget function and the final return here is the DOM node that triggered the event.When talking about how to become outstanding, Turing Award winner Richard Hamming believed that practice time was not so important, nor could it be precise and explicit. He wrote:青木面色比平常更加沉了三分。大家注意，敌人进来了，就在我们中间。Intelligent shopping guides have solved this problem very well. "80% of the customers in Osaka Weaving House are Tmall users, and consumers will think it is normal to receive shopping guide information through hand-washing." Wang Bo said that the intelligent shopping guide can push specific product information such as "striped short-sleeved household clothes" and "cotton pajamas" according to customer characteristics, greatly improving the conversion rate.刘邦小的很满意，很灿烂。Zhao Yuan, founder of Yixiu Mathematical Thinking: "Thinking ability products are not as direct and obvious as programming can make some programs, or as direct and obvious as mathematics can calculate a problem. Therefore, how to formulate an evaluation standard recognized by parents and present the curriculum effect is a big challenge that the industry will face."