Use JQ to cover the single-screen page rolling effect of Baidu books pre-sale page

Use JQ to cover the single-screen page rolling effect of Baidu books pre-sale page
The principle page rolling method must be implemented through animate. The clicked a tag index is used to determine which page to roll. At the same time, we also need a global variable to store the index of the current page, so that we can roll the page through the scroll wheel event. In addition, the callback event is also called here, including the callback of the activated page when the page is clicked, And the callback of other non-activated pages. To improve reuse, we will use eval () for help, but note that both callbacks should be triggered after the page rolling (animate. Let's first write down the page prototype: copy the Code <! DOCTYPE html>