https://medium.com/s/story/no...
ask him to order this menu on the left
he will change the fixed based on the position of "it" on the scroll
scroll to the bottom "it" will stop at the specified location
what technique is this? How can it be realized?
js listens for scrolling events and sets the left column to fixed when scrolling to a certain position.
is actually listening for scrolling events
css sprite
position:sticky (poor compatibility)
or listen for scrolling events
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