javascript - bootstrap導航欄莫名多出20px，怎么回事
問題描述
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問題解答
回答1：這是因為，Bootstrap的導航欄只是默認是51px高，而并非永遠是51px高，如果其中有元素出現多行，是會將高度撐高的。
你的demo里，由于有一個標簽多了一個Link，所以將整個導航欄撐高了20px。
是不是框架給的? marign:0 或者padding:0 有木有效
回答3：你可以在控制臺DOM樹上找到導航欄，然后一個一個的從里往外刪元素，排查到是哪個元素導致的
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