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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:Tuberculosis is cured within one year and has good physique and is qualified.《爱的代驾 》讲述了代驾小哥工作中遭遇的风流奇事。平行麦现场首期Live专场，郝云超级在线演唱会即将开始。多情境在线音乐之旅诠释郝式演出新模式，一镜到底、迥异光影、多场景切换、行进式演出，带你体验一场与众不同的在线演唱会。　　三人依照一 张人皮地图穿过遮龙山下古滇国秘密地下水道，不料遭遇千年痋术机关，成千上万个奴隶制成的“痋俑”像炸弹一样倒悬在洞顶，当它们接二连三地落入水中，引发的却是一连串的弱肉强食，一物降一物；丛林中夜现“SOS”电码，是曾经葬身此地的飞虎队队员怨魂作祟，还是献王的大祭师设下的迷局……Strategically speaking, it may not be a very smart choice to completely turn a blind eye to sharp deviations, especially when this situation occurs when positions are very concentrated. Of course, this may easily miss dozens of times the myth, but it can also avoid the risk of putting all your eggs in one basket. The degree between these choices is related to the basic expectation of investment, the choice of risks and profits, opportunity cost, etc.As far as a class is concerned, there should be only one reason for it to change. If a class assumes too many responsibilities, it is tantamount to coupling these responsibilities together. Changes in one responsibility may affect other responsibilities. In addition, coupling multiple responsibilities together will also affect reusability.