react-component / react-component/util
switchScrollingEffect.js 中的isBodyOverflowing方法，在下面一种场景中有点欠缺：
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Description
switchScrollingEffect.js 中的isBodyOverflowing方法，在下面一种场景中有点欠缺：
在全局的body的样式上增加了overflow-y:scroll,至于为什么要加，原因是想解决左侧菜单栏切换，右侧对应的内容有无溢出不会出现页面抖动的问题。
例如：https://preview.pro.ant.design/dashboard/analysis
从分析页面到异常页403，右侧内容就会因为滚动条的原因抖动。
如果把这个样式设置到html 上，虽然没上述问题，但是在结合弹框Modal 使用时，就会出现弹框的遮罩层遮不住滚动条，也有点不合适。
在上面这种场景下，isBodyOverflowing期望是被返回true 的。
Originally posted by @yangdongMC in https://github.com/react-component/util/pull/65#issuecomment-571016566
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