While Clicking on drop down created in Navigation menu, it is throwing "Uncaught TypeError: Cannot read property 'top' of undefined". can any one please help me to identify error.While Clicking on drop down created in Navigati
阅读背景：
未捕获的TypeError：在bootstrap中单击导航栏时无法读取未定义的属性“top”
来源：互联网
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