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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:On personal computers, there are five most commonly used operating systems: DOS, Windows, Unix/Xenix, and OS/2. DOS System-In the 17 years since its inception in 1981, DOS has undergone 7 major version upgrades, from version 1.0 to version 7.0 now, continuously improving and perfecting. Windows System-Windows is the first generation of window visual interface published by Microsoft in November 1985, which makes PC enter the so-called GUI (Graphical User Interface) stage. Unix system. Unix systems were initially used on small and medium-sized computers. Unix is a multi-user system, which generally requires more than 8M of memory and a large capacity of hard disk. Linux system-Linux is the largest free software in the world at present. It is an operating system with functions comparable to UNIX and Windows and has complete network functions.好了，这次原谅你了。所以，刚才他竟然表达了自己的愿望，而不是像平常那样听话，黄豆可不高兴，当然百依百随了。The research on classification ability is more in kindergartens and more in primary schools. Research by cognitive psychologists has found that children under 0-1 years old basically have no classification ability, and they mainly rely on individual perception. The classification ability of children aged 1-3 has begun to sprout, but the concept of "category" has not yet formed. The classification of children aged 3-5 is basically still based on external perceptible dimensions such as shape and color. For example, children in small classes in kindergartens are asked to classify red plastic balls, red apples and bananas. They will divide the balls and apples together, either according to the shape (circle) or according to the color (red), but they will not put apple kernel bananas together according to the function (edible). What if you add another celery?人类持续破坏环境，是时候动物们该站出来捍卫生存权益……　　看似平凡的亚当，和雪丽（母亲）、大脚怪（父亲）以及他们的朋友伟波（大灰熊）、蒂娜（松鼠）、崔波（浣熊）一家人，这个非凡的大家庭一起在森林里定居。没想到随着大脚怪父亲越来越有名，父亲也利用名气尝试改变世界。某天动保团 体与父亲联系，打算一起阻止石油公司开发并污染动物的生存环境，没想到父亲在一次追查真相的过程中竟然莫名失踪了！亚当和他的动物家人们，决定联手找出大脚怪父亲的下落，同时透过社群媒体试图揭发石油公司的邪恶阴谋，他们一家人还有机会再次团聚吗？香荽点头道：嗳。