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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:若是放在平常的时候那是肯定的，但是现在情况比较复杂，因为我们背后尚有一个刘邦，他才是我们最大的敌人。Now use code to describe this scene. First, define a Light class. It can be predicted that the light object light will be created from the Light class. The light object will have two attributes. State will be used to record the current state of the light and button will be used to represent the specific switch button.In simple and popular terms, it is "white plus black minus, bright plus dark minus"2. Import a variable that does not exist, and the value is undefined.半个时辰之后，黎章回归了。