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bootstrap的滾動監聽

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>bootstrap中滾動導航監聽主要的就是在導航中a標籤的href屬性值與要控制的div的id屬性對應</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <style>
        body {
            position: relative;
        }
        #section1 {padding-top:50px;height:500px;color: #fff; background-color: #1E88E5;}
        #section2 {padding-top:50px;height:500px;color: #fff; background-color: #673ab7;}
        #section3 {padding-top:50px;height:500px;color: #fff; background-color: #ff9800;}
        #section41 {padding-top:50px;height:500px;color: #fff; background-color: #00bcd4;}
        #section42 {padding-top:50px;height:500px;color: #fff; background-color: #009688;}
    </style>
</head>
<body data-spy="scroll" data-target=".navbar" data-offset="50">
        <nav class="navbar navbar-inverse navbar-fixed-top">
            <div class="container-fluid">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>                        
                    </button>
                    <a class="navbar-brand" href="#">WebSiteName</a>
                </div>
                <div>
                    <div class="collapse navbar-collapse" id="myNavbar">
                        <ul class="nav navbar-nav">
                            <li><a href="#section1">Section 1</a></li>
                            <li><a href="#section2">Section 2</a></li>
                            <li><a href="#section3">Section 3</a></li>
                            <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">Section 4 <span class="caret"></span></a>
                                <ul class="dropdown-menu">
                                    <li><a href="#section41">Section 4-1</a></li>
                                    <li><a href="#section42">Section 4-2</a></li>
                                </ul>
                            </li>
                        </ul>
                    </div>
                </div>
            </div>
        </nav>    

<div id="section1" class="container-fluid">
    <h1>Section 1</h1>
    <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
    <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
    </div>
    <div id="section2" class="container-fluid">
        <h1>Section 2</h1>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
    </div>
    <div id="section3" class="container-fluid">
        <h1>Section 3</h1>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
    </div>
    <div id="section41" class="container-fluid">
        <h1>Section 4 Submenu 1</h1>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
    </div>
    <div id="section42" class="container-fluid">
        <h1>Section 4 Submenu 2</h1>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
        <p>Try to scroll this section and look at the navigation bar while scrolling! Try to scroll this section and look at the navigation bar while scrolling!</p>
</div>

</body>
</html>