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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:Alert ('three ');The other conditions are subsidiary conditions, so it is said separately.Come and join Binjiang Environmental Protection QQ Group: 202412159 or　　在20世纪30年代的德州，政府依旧沿用着自19世纪70年代开始制定的对黑人实行种族隔离或种族歧视的法律——黑人被剥夺选举权，并在学校、住区、公共交通、公共场所以及就业、司法、军役、婚姻等各方面，受到残酷的隔离和歧视。马文·托尔森作为一名有知识有头脑的黑人非常希望通过自己的故事发生在虚构的中原大陆。十国之中，南赵国与北燕国比邻而居。为了防御日益强大的北燕，南赵举办比武大会，选拔将才。消息传到偏僻的清源村，村民东一龙想成为家族的举旗人，代表清源村家族出赛，村民们却质疑他的资格，经过一番努力，一龙终于踏上了与武士楚魂的征途……