Bootstrap 4 Navbar点击Collapse无反应的解决方法

代码部分

<nav class="navbar navbar-expand-lg navbar-light bg-light">

        <div class="container">

                <a href="index.html" class="navbar-brand"></a>

                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">

                    <span class="navbar-toggler-icon"></span>

                </button>

            <div class="collapse navbar-collapse" id="navbarNav">

                <ul class="navbar-nav">

                    <li class="nav-item pr-5">

                        <a class="nav-link" href="">首页</a>

                    </li>

                    <li class="nav-item pr-5">

                            <a class="nav-link" href="">首页</a>

                    </li>

                    <li class="nav-item pr-5">

                        <a class="nav-link" href="">首页</a>

                    </li>

                    <li class="nav-item pr-5">

                        <a class="nav-link" href="">首页</a>

                    </li>

                </ul>

                <ul class="navbar-nav ml-auto">

                    <li class="nav-item pr-5">

                            <a class="nav-link" href="">首页</a>

                    </li>

                    <li class="nav-item pr-5">

                        <a class="nav-link" href="">首页</a>

                    </li>

                </ul>

            </div>

        </div>

    </nav>

解决方法：

1. 必须引用bootstrap的js和jQuery库

2. jQuery必须在js之前引用

引用如下：

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>