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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:而昨天的杨长帆与今天的杨长帆，唯一的不同就是多了顶乌纱帽。　　心怀镖头理想的雷儿当了镖局的趟子手，同时对朝夕相处的武魁暗生情愫。武魁钟情于没落王府格格谟娅，这让雷儿暗自神伤。在护送谟娅的任务中，雷儿闹出了笑话一箩筐。但当路遇悍匪的紧要关头，雷儿挺身而出。正是雷儿的勇敢，得到了土匪首领哑狼的爱慕。当晚，郑氏看着红椒脸色纳闷不已，明明心情不好，为何还跟田遥耗了半天？饭后，她想叫闺女去说话，谁知红椒吃了一半就走了，留下一屋子人诧异。这家酒吧叫Horace and Pete，开了一百年，这一个世纪由历代的Horace和Pete来经营。这家年迈的酒馆在光鲜的布鲁克林似乎已经过气了，现在的主人也如同这家疲倦的酒馆一样。Horace离过婚，没有固定女友，跟子女处理不好关系；Pete一辈子都在这家酒吧里，有精神疾病，一旦停药就会失控。还有他们的叔叔、姐姐、前妻、爷爷的前女友、不定期的床伴以及定期的老顾客，构成了属于这家酒馆的百年江湖。