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However, because the server cannot get the Referer at all times, it cannot be used as the main means of CSRF defense.永远有多远？眼窝一热，不忍再跟他对视，拨转马头就走。跟云影回了退礼的情形。The arrangement of devices on the printed board is as uniform as possible and the orientation of devices is as consistent as possible. In addition, special attention should be paid to the arrangement of power supply and ground wire to meet the electrical performance requirements of the circuit. Attention should be paid to weak current and strong current, strong current and strong current, photoelectric isolation between power supply and ground wire, and sufficient creepage distance between internal and external circuits.For example, Xiao Hong recently saw a pair of shoes on Taobao. But after contacting the seller, Only to find out that these shoes were sold out, But Xiao Hong likes these shoes very much, So contact the seller and ask when the seller will have the goods. The seller told her that it will take a week to have the goods. The seller told Xiaohong that if you like, you can collect our store and inform you when the goods are available. Therefore, Xiaohong collected the store, but at the same time, Xiaoming and Xiaohua also liked the shoes and collected the store. They will be notified in turn when the goods arrive.The following is a review of the source code with this conclusion, but this time the analysis is not the down event, but the event after the down. Just look at the key parts. The number 2 of the above code is as follows: