关于页面被水印撑开导致页面底部出现空白的问题 #74
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1. 将水印的高度计算使用 `clientHeight `，水印的定位样式改为：`position: fixed`，目的在于解决页面数据动态增加后，水印相印的撑开页面，页面数据减少后，水印仍然撑开页面导致底部出现大块的空白。在 vue 框架下，使用 tab 组件或表格筛选数据时会出现这样的问题。 2. `mutationObserver.observer` 监测父节点选项 `subtree: false`，此为节省性能，同时也能起到防止水印被删除。 3. 移除底部未使用的代码； 4. 修改之前存在的一些问题，如监听水印内容
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clientHeight，水印的定位样式改为：position: fixed，目的在于解决页面数据动态增加后，水印相印的撑开页面，页面数据减少后，水印仍然撑开页面导致底部出现大块的空白。在 vue 框架下，使用 tab 组件或表格筛选数据时会出现这样的问题。mutationObserver.observer监测父节点选项subtree: false，此为节省性能，同时也能起到防止水印被删除。