The jQuery pop-up layer is always vertically centered relative to the screen or the current window _ jquery

When there is no fixed height or fixed width or fixed height or width, we need to use JS to dynamically obtain the current window height or width. Today we have two situations, one is relative to the screen form, and the other is relative to the current window. Viewing the code pop-up layer is always something that must be done by the front end. Generally, if the pop-up layer has a fixed height and width, you can use the style. However, if there is no fixed height or fixed width or fixed height or width, we need to use JS to dynamically obtain the current window height or width; today we have two cases: one is relative to the screen form, and the other is relative to the current window. It may be useful to you to read the code:

The Code is as follows:

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