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Central focus metering: It is a traditional metering method, which pays attention to about 2/3 of the position in the center of the picture. The advantage of this metering method is that it is easier to control the effect.6. Don't look at stocks that are not rising channels at all. No matter what happens in the future, don't accompany the main force to build a warehouse. I don't have time to spend with them.As long as the target of the tank stands at the non-judgment point, the tank will only go straight in the direction of the target foolishly, and if there are obstacles, it will be stuck, and the oil drum will sometimes get him stuck.正踌躇间，就有胡家下人惊慌来报，说朱雀将军带着爹娘嫂子，还有白虎将军的爷爷奶奶和娘，正聚集在胡家门口闹事呢，引得上万人观看，把一条景泰路都堵得严严实实。Code as above; You can see, There are obvious shortcomings, For example, when I click on an element, I need to create a div. I click on the second element to create a div again, We frequently click on such and such elements, and they will frequently create div elements. Although we can remove pop-up codes when we click Close, it is not good for us to frequently create and delete them, especially for performance, and frequent operations on DOM will cause redrawing, etc., thus affecting performance. Therefore, this is a very bad habit. We can now use the monomer mode to realize the pop-up effect. We can instantiate it only once. The following code:The above code, let's run and print as follows: