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Although the above pop-up code has completed the effect of creating pop-up windows using single mode, the code is not universal. For example, the above is the code for completing pop-up windows. What if we need an iframe on the page in the future? Do we need to rewrite a set of code to create iframe? For example, create an iframe as follows:得知越王即将建都于此后，各地有先见之明的大户纷纷迁往长安，形成一个新的大都市。同时我们也会用法律手段追究那些诋毁之人的责任。短片中两人饰演的一对男女面对面的交流越来越少，很多事情都会通过微博来交流，甚至连吵架都通过微博完成。《倚天屠龙记之魔教教主》临近下架，《唐伯虎点秋香》火热放映，就在这时，天启的微-博突然有动静了。嗯，你们来得真早。Difference mode. According to the brightness distribution of the colors on the upper and lower sides, the color values of the upper and lower pixels are subtracted. For example, if the maximum white value is used for Difference operation, the inverted effect will be obtained (the lower color is subtracted to obtain the complement value), while if the black value is used, there will be no change (the black brightness is the lowest, the lower color subtracts the minimum color value of 0, and the result is the same as before).