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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:故事讲述张皓南，刘传亨及郑胜本乃好友，其后南、胜考入香港飞虎队，亨则继承其父之黑帮事业，三人对立，但因感情深厚，遂仍能互相容忍。 亨妹传芳暗恋南，惜神女有心，襄王无梦，南与女警官利琪琪热恋，芳伤心之余，下嫁一直暗恋她的胜。 亨初涉足黑道，遭老叔父玩弄，幸得红颜知己Anita支持鼓励，终于排除异己，势力逐渐扩张。 亨终于成为黑道大阿哥，与南决裂，南誓要将亨绳之于法，南姐张五、胜、Anita及芳先后惨死，南、亨达到不死不休之地步……From the reasons why parents choose to cultivate their thinking ability and the results they hope to achieve, it can be found that parents want their children to accept the needs of cultivating their thinking ability, but they do not have high requirements for learning. They only hope that their children will lay the foundation for their children, form a state of preparation, and be open to learning results before formally receiving primary education.1. Consumption by oneself and termination of transmission. -----> return true;明朝末年，皇帝昏庸，曾保家卫国屡建功勋的锦衣卫被奸佞利用，沦为暗杀工具，令世人闻风丧胆。因谋权篡位而被施以刖刑的庆亲王（洪金宝 饰）虽被流放塞北多年，然野心不死，暗中勾结大太监贾精忠（罗家英 饰），企图卷土重来。贾精忠在中土掀起一场腥风血雨，不愿苟从者格杀勿论。锦衣卫指挥史青龙（甄子丹 饰）在执行任务过程中因发现贾精忠阴谋而被追杀，身受重创后委身正义镖局以图保护玉玺。茫茫大漠，青龙在镖头之女乔花（赵薇 饰）以及天鹰帮帮主大漠判官（吴尊 饰）的帮助下准备阻止庆亲王与贾精忠的阴谋，此时，庆亲王义女——拥有绝世武功的脱脱（徐子珊 饰）身负追杀青龙的使命亦赶至雁门关……看来Sara还是耐不住寂寞，CSI的制作人们也病急乱投医，为了挽救下滑的收视率，刚刚离开该剧还不到一年的Jorja Fox正式和剧组签约，将重返CSI，在第10季中出演若干集。　　谜团奇案，重重交错；冷血凶徒，幕幕惊心！人在做，天在看！「灭罪铁三角」坚守「邪不胜正，恶不抵善」的信念，誓为死者发声，替生者雪冤！