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The first scheme is to use the general coding method to realize the preloading technology of the picture. First, create the imgNode element, Then when the method myImage.setSrc is called, a preloaded picture is given to the picture first, and when the picture is loaded, the img element is assigned a value. The second scheme is implemented by using proxy mode. MyImage function is only responsible for creating img elements, proxy function ProxyImage is responsible for setting loading pictures for the picture, and when the picture is really loaded, myImage.setSrc method in myImage is called to set the path of the picture. The advantages and disadvantages between them are as follows:A program based on policy mode consists of at least two parts. The first part is a set of policy classes, which encapsulate specific algorithms and are responsible for specific calculation processes. The second part is the environment class Context, which receives the client's request and then delegates the request to a policy class. We first use traditional object-oriented to implement it.该剧是建党百年献礼剧献礼剧，1959年夏秋，一场大旱无情吞噬林县，河塘、水库干涸，庄稼大面积枯死，人畜用水陷入极端困境。林县县委一班人在县委书记杨桂带领下，决心彻底改变林县祖辈缺水困境。经过缜密实地调查，县委决定修建引漳入林工程红旗渠，重新安排林县河山，彻底改变林县人民自古缺水困局。杨桂和县委一班人带领林县人民，克服自然灾害带来的重重困难，顶住部分人冷嘲热讽，千军万马、战天斗地修建“引漳入林工程”，历时十年，终于在太行山腰修成了人工天河红旗渠。2150年，一艘深空渔船进入未知空间，以捕获一个巨大的黑市生物。　　随着剧集的展开，Clark在Daily Planet的新工作也是和Lois四处奔波。这两个人也会组成小队，来保卫大都市的和平。有时候Lois反倒成了Clark的最大障碍，特别是当他在生死之间时。Clark和Lois的亲密合作，飞行时迸发的火花都让他们俩人特别惊讶。同时，Clark也开始发现他必须要掌控分寸，来掩饰他的双重身份，记者和超级英雄。小鱼儿看到苏樱，同样十分高兴，说道：我知道你一定会回来的。