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changecoder-utils

v0.0.3

Published

判断滚动条到底部，需要用到DOM的三个属性值，即scrollTop、clientHeight、scrollHeight。 1. scrollTop: 滚动条在Y轴上的滚动距离 2. clientHeight: 内容可视区域的高度(元素内容及其边框所占据的空间大小) 3. scrollHeight： 内容可视区域的高度加上溢出（滚动）的距离(元素内容的总高度) 从这三个属性的介绍就可以看出来，滚动条到底部的条件即为scrollTop + clientHeight == scrollHeight。

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Utils

判断滚动条是否到底部

判断滚动条到底部，需要用到DOM的三个属性值，即scrollTop、clientHeight、scrollHeight。

  1. scrollTop: 滚动条在Y轴上的滚动距离
  2. clientHeight: 内容可视区域的高度(元素内容及其边框所占据的空间大小)
  3. scrollHeight： 内容可视区域的高度加上溢出（滚动）的距离(元素内容的总高度) 从这三个属性的介绍就可以看出来，滚动条到底部的条件即为scrollTop + clientHeight == scrollHeight。
  4. offsetHeight：获取元素可见高度

document.compatMode

IE对盒模型的渲染在 Standards Mode和Quirks Mode是有很大差别的，在Standards Mode下对于盒模型的解释和其他的标准浏览器是一样，但在Quirks Mode模式下则有很大差别，而在不声明Doctype的情况下，IE默认又是Quirks Mode。所以为兼容性考虑，我们可能需要获取当前的文档渲染方式。

  1. BackCompat： 标准兼容模式关闭(混杂模式)，浏览器客户区宽度是document.body.clientWidth
  2. CSS1Compat： 标准兼容模式开启，浏览器客户区宽度是document.documentElement.clientWidth 浏览器客户区高度、滚动条高度、滚动条的Left、滚动条的Top等等都是上面的情况。