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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:GBL Colossus南宫珉饰演罗以帝，他是泰江医院应急医学中心的精英，医术高超，是一个不在意社会地位高低，绝不会忘记医生和患者的缘分的充满人性魅力的男人。Buckeye flowers have different colors, generally yellow, orange and pink. Why do flowers of the same plant have three colors? This is actually the way Buckeye flowers tell bees and bumblebees whether they are popular at this moment. Those flowers with nectar and waiting to be pollinated will appear yellow, which is an irresistible color for insects. When pollination is over, the flowers will slowly turn red, because bees and bumblebees cannot see red, thus the flowers will disappear in their eyes.You can tell me first