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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:于是————力拔山河，翻江倒海是为武侠。一群走投无路并急需金钱的人收到神秘邀请，邀请他们共同加入一场游戏。为了赢取 456 亿韩元的奖金，背景各异的 456 名参赛者被关在秘密场所进行游戏。每一轮游戏都是韩国人小时候会玩的传统游戏，如一二三木头人，但闯关失败的后果是死亡。谁将是最终赢家，这个游戏的目的是什么？但是在最后的第七次冒险中遇到了神秘的巨大生物，被荒废的城市世界放飞了！姜国公端起茶盏喝了一口茶，并不理她。《芝加哥警署》（Chicago P.D.）里哪位警官需要医生？因为这里正好有一个医生的家属！再者，我最讨厌别人咒我。