【Web前端问题】bootstrap导航栏莫名多出20px，怎么回事

图片描述

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<head>
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</head>
<body>
    <nav class="navbar navbar-inverse navbar-fixed-top">
        <div class="container">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapase" data-toggle="collapase" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
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                </button>
                <a class="navbar-brand" href="#">Brand</a>
            </div>
            <!-- Collect the nav links, forms, and other content for toggling -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1" >
                <ul class="nav navbar-nav">
                    <li class="active"><a href="#">Link <span class="sr-only"></span></a>Link</li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
                        <ul class="dropdown-menu">
                            <li><a href="#">Action</a></li>
                            <li><a href="#">Another action</a></li>
                            <li><a href="#">Something else here</a></li>
                            <li><a role="separator" href="#"></a></li>
                            <li><a href="#">Separated link</a></li>
                            <li><a role="separator" href="#"></a></li>
                            <li><a href="#">One more separated link</a></li>
                        </ul>
                    </li>
                </ul>
            </div>
        </div>
    </nav>
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    <!-- Include all compiled plugins (below), or include individual files as needed -->
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    <script src="main.js">
    </script>
</body>
</html>

回答：

这是因为，Bootstrap的导航栏只是默认是51px高，而并非永远是51px高，如果其中有元素出现多行，是会将高度撑高的。

你的demo里，由于有一个标签多了一个Link，所以将整个导航栏撑高了20px。
clipboard.png

回答：

是不是框架给的? marign:0 或者padding:0 有木有效

回答：

你可以在控制台DOM树上找到导航栏，然后一个一个的从里往外删元素，排查到是哪个元素导致的

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