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我一直在關注如何使用CSS創建下拉菜單的在線視頻。我跟着它，我的網站上沒有任何下拉菜單的跡象。這太令人沮喪了，因爲我想要解決它，所以我現在可以專注於後端開發。希望你們可以弄清楚這一點。CSS下拉菜單不工作？
代碼的html：
<!DOCTYPE>
<html lang="en">
<head>
<title>MUSIC STORE</title>
<script src="js/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="jquery.bxslider.css"/>
<link rel="stylesheet" href="styles.css"/>
<link rel="shortcut icon" type="image/png" href="../Music Store/img/rockSign.png"/>
</head>
<body>
<div id="wrapper">
<header id="main_header">
<div id="callout">
<h2>☎ 111222333</h2>
<p>Michigan State Kawasaki Iceland</p>
</div>
<h1>MUSIC STORE</h1>
</header>
<div class="clearfix"></div>
<nav id="nav_menu">
<ul id="nav">
<li><a href="#">HOME</a></li>
<li><a href="#">INSTRUMENTS</a>
<ul class="sub-menu">
<li><a href="#">ELECTRIC GUITARS</a></li>
<li><a href="#">BASS GUITARS</a></li>
<li><a href="#">DRUMS</a></li>
</ul>
</li>
<li><a href="#">AMPLIFIERS</a></li>
<li><a href="#">ACCESSORIES</a></li>
<li><a href="#">FEATURED ARTISTS</a></li>
</ul>
</nav>
<script src="js/jquery.bxslider.min.js"></script><!--For Image Slider-->
<div class="slide-wrap">
<div class="slider">
<ul class="slider1">
<li><img src="../Music Store/img/ibanez.jpg"/></li>
<li><img src="../Music Store/img/raven.jpg"/></li>
<li><img src="../Music Store/img/metallica.jpg"/></li>
</ul>
</div>
</div>
<script type="text/javascript">
$('.slider1').bxSlider({
mode: 'fade',
captions: false,
auto:true,
pager:false,
});
$('.slider2').bxSlider({
pager:false,
captions: true,
maxSlides: 3,
minSlides: 1,
slideWidth: 230,
slideMargin: 10
});
$('.slider3').bxSlider({
mode: 'fade',
captions: false,
auto:true,
pager:false,
controls:false,
});
</script>
<section class="one-third">
<div class="border_section">
<h3>NEW BASS AMPS THIS YEAR</h3>
<img src="../Music Store/img/fender_amps_bassbreaker.jpg"/>
<p>We would like to proudly announce the new shipment of fender bass amps that you all have been
waiting for. It will provide you that rich rock and roll tone like no other. Please check
out our bass amp section for more details.</p>
</div>
</section>
<section class="one-third">
<div class="border_section">
<h3>NEW FEATURE ARTIST</h3>
<img src="../Music Store/img/feature_markHolcomb.jpg"/>
<p>Behold Mark Holcomb from Periphery is in the house! Check out his info and new signature guitar
at our feature artists section. He will also be having a 20-minute guitar clinic on Oct 8 2016 right
here at Music Store.</p>
</div>
</section>
<section class="one-third">
<div class="border_section">
<h3>ATTENTION VOCALISTS!</h3>
<img src="../Music Store/img/GoMic.jpg"/>
<p>Check out the new Samson Go Mic Connect. It has a top-notch noise cancellation feature that can
definitely minimize the annoying sound that your dog makes while your recording. For more details,
Go to Accessories section.</p>
</div>
</section>
<div class="clearfix"></div>
<footer>
<p>©All Rights Reserved</p>
</footer>
</div>
</body>
</html>
代碼CSS：
@import url(http://fonts.googleapis.com/css?family=Black+Ops+One:400,700); /*--- Header --*/
@import url(http://fonts.googleapis.com/css?family=Open+Sans:400,700); /*--- Navigation --*/
*
{
margin: 0;
border: 0;
padding: 0;
}
body
{
background-image: url('../Music Store/img/background.png');
background-repeat: repeat-x;
}
.clearfix
{
clear:both;
}
#wrapper
{
margin: 0 auto;
max-width: 1120px;
overflow: auto;
border: 1px solid black;
}
#main_header
{
width: 100%;
font-family: 'Black Ops One', sans-serif;
background-color: black;
border: 1px solid black;
color: white;
}
#main_header h1
{
float: left;
font-size: 380%;
margin: -10% 0 0 2%;
}
#callout
{
margin: 50px 20px 0 0;
}
#callout h2{
text-align: right;
color: white;
}
#callout p{
text-align: right;
padding: 0%;
color: grey;
font-size: 20px;
margin-bottom: 3px;
}
#nav_menu
{
width: 100%;
height: 10%;
background-color: white;
}
#nav_menu li
{
display: inline-block;
margin: 20px 20px 20px 63px;
font-family: 'Open Sans', sans-serif;
font-size: 20px;
font-weight: bold;
}
#nav_menu li a
{
text-decoration: none;
color: black;
}
#nav_menu li a:hover
{
color: grey;
}
.sub-menu
{
position: absolute;
background-color: black;
list-style-type: none;
width: 124px;
padding-left: 0px;
margin-left: -25px;
padding-top: 5px;
opacity: 0;
}
.sub-menu li
{
padding-left: 25px;
padding-top: 5px;
padding-bottom: 5px;
}
#nav_menu li:hover .submenu
{
opacity: 1;
}
.sub-menu li:hover
{
color: green;
background-color: yellow;
}
/*--- Start Image Slider --*/
.slider{
max-width: 1120px;
box-shadow: 1% 2% 5% 0 rgba(0, 0, 0, 0.07);
}
.slider1 img{
width: 100%;
margin: 0 auto;
}
.slider .bx-wrapper .bx-controls-direction a{
outline: 0 none;
position: absolute;
text-indent: -9999px;
top: 40%;
height: 71px;
width: 40px;
z-index: -1;
transition: all 0.7s;
}
.slider .bx-wrapper:hover .bx-controls-direction a{
z-index: 5;
}
.slider .bx-wrapper .bx-prev{
background: url("../Music Store/img/arrow_left.png") no-repeat 7px 9px;
left: 0px;
}
.slider .bx-wrapper .bx-prev:hover{
background: url("../Music Store/img/arrow_left.png") no-repeat 8px 15px;
}
.slider .bx-wrapper .bx-next{
background: url("../Music Store/img/arrow_right.png") no-repeat 10px 12px;
right: 0px;
}
.slider .bx-wrapper .bx-next:hover{
background: url("../Music Store/img/arrow_right.png") no-repeat 10px 17px;
}
/*--- End Image Slider --*/
.one-third img{
text-align: center;
max-width: 100%;
height: auto;
opacity: 0.9;
}
.border_section p{
font-family: 'Lato', sans-serif;
padding: 2%;
color: white;
text-align: justify;
}
.border_section h3
{
font-family: 'Open Sans', sans-serif;
text-align: center;
color: white;
text-transform: uppercase;
letter-spacing: 1%;
}
.border_section
{
border: 1px solid black;
background-color: black;
}
.one-third{
width: 27.35%;
float: left;
margin: 2% 0 3% 4.5%;
text-align: center;
background-color: white;
}
footer{
font-family: 'Open Sans', sans-serif;
font-weight: bold;
text-align: center;
width: 100%;
height: 6%;
background-color: black;
overflow: auto;
}
footer p
{
margin-top: 1%;
color: white;
}
認真嗎？ -3？大聲笑！在這裏得到了許多來自css怪胎的仇恨。 – BrunoEarth