my notebook 📒
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my notebook 📒
解决思路很明显:当容器可以滑动时,若已经在顶部,禁止下滑;若在底部,禁止上滑;容器无法滚动时,禁止上下滑。
基本实现方式是通过 document 上监听 touchstart 和 touchmove 事件,判断滑动方向;判断滑动事件的触发 target 祖先元素是否有可滑动元素,无则直接阻止冒泡。
若有这种祖先元素,判断其状态:offsetHeight >= scrollHeight 高度不够发生滚动,阻止冒泡;若可滚动 scrollTop === 0 即在顶部,阻止下滑的冒泡;若 scrollTop + offsetHeight >= scrollHeight 已经滑到底,阻止上滑的冒泡。
还需注意的是,要先判断滑动时 x 轴位移是否大于 y 轴 ,即是否是水平滑动,防止“误伤”一些水平滚动的元素。
页面里连惯性滚动都没有?是不能加还是有 bug?
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