避免事件重复触发
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// 每次事件触发后，先清除之前的事件，再继续执行
floor.$win.on('scroll resize', floor.showFloor = function() {
clearTimeout(floor.floorTimer);
floor.floorTimer = setTimeout(floor.timeToShow, 250);
})
参考
- https://class.imooc.com/lesson/807#mid=20292
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// 每次事件触发后，先清除之前的事件，再继续执行
floor.$win.on('scroll resize', floor.showFloor = function() {
clearTimeout(floor.floorTimer);
floor.floorTimer = setTimeout(floor.timeToShow, 250);
})
