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Compared with the example of electric lights, file uploading differs in that it will now face more complicated conditional switching relationships. In the example of an electric lamp, the state of the electric lamp is always from off to on and then to off, or from off to low light, low light to strong light, strong light to off. ABCA always seems to follow the rules, so even if you don't use the state mode to write the light program, but use the original if, else to control the state switching, you won't lose yourself in logic writing, because the state switching always follows some simple rules.戴安娜是亚马逊一族的公主，生活在天堂岛上。天堂岛是一个纯女人的国度，居民们都长生不老、头脑聪明，且拥有着巨大神力。因为一起意外事件，戴安娜离开家乡，来到了钢筋水泥的城市里，从此作为天堂岛的使者保护人类……打败熊霸之后，兔二（黄磊 配音）被视为打败邪恶和维护正义的保护者而受到人们膜拜。被突如其来的声望冲昏头脑的兔二不再苦练武功，一心要行走江湖行侠仗义。某一天，兔二在河边救了玄火教的一位长老展天（王劲松 配音），结果就此陷入一场阴谋之中。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:此剧以桃花镇为背景，讲述抗日战争期间烽火连天，时局动荡，人人得以自危，乱世儿女为求自保只好将人性扭曲、挣扎求存。但一场又一场的战争致使连退守唯一的净土都失去时，对于情感执著的主角们为争取生存而孤注一掷，即使历尽了艰辛险境，仍然相信乱世终结定必再见“艳阳天”。