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notebook's Issues

禁止微信页面及iOS Safari拖动露底效果 (橡皮筋)

花式提升移动端交互体验

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。

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