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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:　枪击事件导致Fred生命垂危，亲眼目睹一切的Archie彻底情绪失控。与此同时，Veronica决定尽力支持Archie，但这意味着她将离开自己熟悉的安逸环境。她突然得知父亲已经提前出狱，并且已经回到河谷镇…原来，按照五行学说：东青龙为青色，西白虎为白色，南朱雀为朱色，北玄武为黑色。你刚才说送的。蒙古蒙哥大汗南下侵宋，途中遇到飞天炮阻击身受重伤。后法王虽偷得飞天炮，然蒙哥伤势加重，只得撤兵。返程中被忽必烈偷袭，逃入雪山。蒙哥感到命不久已，写下血书，传位尚年幼王子海都后自尽。大雪山中人马走散，飞天炮和血书失踪，海都逃出雪山后遇到受伤的法王，原来他受到中原三大高手的袭击，他们一起返回雪山找寻其它队伍但是雪山迷宫使他们放弃。与此同时三大高手也感无力进入雪山，将进雪山迷城的地图分成三份交各人保存。法王带着海都勉强到达师弟银枪法王处，将海都托付给师弟后毒发身亡。海都从此身负夺回帝位的重任……尹旭心头一震，刘邦这是唱的哪一出？拥立项梁为楚王？亏他想得出来。According to the above description, the proxy mode is relatively easy to understand. Let's look at the code: