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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:众人急忙连声喝止，想用马鞭赶狗，又怕惊了少爷的马，兼之天黑光暗，根本看不清是个什么情形。可是这话叫刘家大房的三儿子听见了，遂不高兴地对锦鲤道：照三妹这么说，咱们兄弟看着老鳖被人打死也不管，是不是？你们姓刘还是姓郑？咋帮外人说话哩？泥鳅大怒：谁不管了？我不是都上去拉架了么。The advantages of monomer mode are:但不知道元帅到底如何破敌？我等也好配合。翟金棠‧气势如虹问鼎上海黑白两道等师姐回来，她就能知道爹娘和葫芦哥哥是否安好了。