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In web development, Picture preloading is a common technique, If you set the src attribute directly to the img tag node, If the picture is larger, Or if the network speed is relatively slow, Before the picture is loaded, The picture will be a blank scene for a period of time. This is not good for the user experience, so at this time we can use a loading loading picture as a placeholder to prompt the user that the picture is being loaded before the picture is loaded. After the picture is loaded, we can directly assign a value to the picture. The following code is as follows when we do not use proxy mode to preload pictures:It is divided into two groups AB. Group A has three signatures A1, A2 and A3. If A3 is drawn, it will be empty and will advance directly to the next match. If A1A2 is drawn for the match, the winner will compete with A3 for a total of 2 matches, and the first and second place in Group A will be obtained.Number of plaintiffs: multiple陈启同样伸出手。《你和我的警察课堂》是讲述比军队更残酷、比牢房更坚固的警察大学的年轻人们波澜壮阔的青春成长罗曼史电视剧。I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.Try the home and end keys, or the page-up and down keys next to them.