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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:他笑道：这么赶？仔细伤了眼睛。费夏尔王子和他的船员冒险走出他们的圆顶人类城市，与想要杀死他们的邪恶外星人作战。当他们开始他们的旅程，费歇尔很快发现，一切都不是它看起来，他可能生活在一个谎言。关于官兵耕种之事，本将军知道如何做了。5. The exclusive lounge is very considerate.　　最近，接连发生在本市的贩毒案和几起命案造成了恶劣的社会影响。案件扑朔迷离，江迈率领手下全力以赴进行侦破，但狡猾的罪犯却似乎总能先发制人，侦破线索一个个先后中断，使侦破工作一波三折，江迈知道，自己这次遇到了真正的对手。省厅高度重视，成立专案组，派来省刑侦处的任则来担任专案组的副组长。这使江迈面临空前的信任危机。