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我已經創建了一個菜單欄，沒有bootstrap問題是，下拉菜單中的Z-index在下拉菜單中不起作用，下面有一個圖像時我給出了相對位置和絕對位置的圖像和菜單，任何人都可以幫忙嗎？Css下拉菜單z-index問題
代碼：
<ul id="nav">
<li class="current"><a href="#">Home</a></li>
<li><a class="nolink">MASTER</a>
<ul>
<li><a href="master_textile.php">TEXTILE</a></li>
<li><a href="master_nontextile.php">NON-TEXTILE</a></li>
<li><a href="branch_name_master.php">BRANCH NAME</a></li>
<li><a href="initial_stock.php">INITIAL STOCK - TEXTILE</a></li>
<li><a href="initial_stock_non_textile.php">INITIAL STOCK - NON TEXTILE</a></li>
<li><a href="initial_stock_silk.php">INITIAL STOCK - SILK</a></li>
<li><a href="customer_details_master.php">CUSTOMER DETAILS</a></li>
<li><a href="percent.php">PERCENT</a></li>
</ul>
</li>
<li><a class="nolink">PURCHASE</a>
<ul>
<li><a href="purchase_textile.php">TEXTILE</a></li>
<li><a href="purchase_silk_textile.php">SILK</a></li>
<li><a href="purchase_nontextile.php">NON-TEXTILE</a></li>
</ul>
</li>
<li><a class="nolink">RETAIL SALE</a>
<ul>
<li><a href="retail_sales.php">TEXTILE</a></li>
<li><a href="retail_sales_silk.php">SILK</a></li>
<li><a href="retailsale_nontextile.php">NON-TEXTILE</a></li>
</ul>
</li>
<li><a class="nolink">WHOLE SALE</a>
<ul>
<li><a href="whole_sales.php">TEXTILE</a></li>
<li><a href="whole_sales_silk.php">SILK</a></li>
<li><a href="whole_nontextile.php">NON-TEXTILE</a></li>
</ul>
</li>
<li><a class="nolink">RETURN BILLS</a>
<ul>
<li><a href="retail_textile_cancel_bill.php">RETURN BILL - TEXTILE</a></li>
<li><a href="silk_return_bill.php">RETURN BILL - SILK</a></li>
</ul>
</li>
<li><a class="nolink">SUMMARY</a>
<ul>
<li><a class="nolink">BILL SUMMARY</a>
<ul>
<li><a href="Summary_textile.php">RS - TEXTILE</a></li>
<li><a href="summary_nontextile.php">RS - NON-TEXTILE</a></li>
<li><a href="wholesale_summary_textile.php">WS - TEXTILE</a></li>
<li><a href="wholesale_summary_nontextile.php">WS - NON-TEXTILE</a></li>
<li><a href="purchase_summary_textile.php">PU - TEXTILE</a></li>
<li><a href="purchase_summary_nontextile.php">PU - NON-TEXTILE</a></li>
</ul>
</li>
<li><a class="nolink">STOCK BOOK</a>
<ul>
<li><a href="stockbook.php">TEXTILE</a></li>
<li><a href="stockbook_silk.php">SILK</a></li>
<li><a href="stockbook_nontextile.php">NON-TEXTILE</a></li>
</ul>
</li>
<li><a class="nolink">ALTER</a>
<ul>
<li><a href="paisa_alter.php">PAISA - ALTER</a></li>
<li><a href="summary_date_alter.php">DATE - ALTER</a></li>
</ul>
</li>
</ul>
</li>
<li><a class="nolink">LOAN</a>
<ul>
<li class="dropdown_submenu non"><a href="#">TEXTILE</a>
<ul>
<li><a href="loanlist.php">VIEW LOAN LIST</a></li>
<li><a href="loan_personal_list.php">PERSONAL LIST</a></li>
<li><a href="loancr.php">LOAN CR</a></li>
</ul>
</li>
<li><a href="">NON-TEXTILE</a>
<ul>
<li><a href="loan_list_nontex.php">PERSONAL LIST</a></li>
<li><a href="loan_cr_nontex.php">LOAN CR</a></li>
</ul>
</li>
</ul>
</li>
<li><a class="nolink">REPORT</a>
<ul>
<li><a href="#">TEXTILE</a>
<ul>
<li><a href="initial_tex_report.php">INITIAL</a></li>
<li><a href="closing_tex_report.php">CLOSING</a></li>
</ul>
</li>
<li><a href="#">NON-TEXTILE</a>
<ul>
<li><a href="initial_nontex_report.php">INITIAL</a></li>
<li><a href="closing_nontex_report.php">CLOSING</a></li>
</ul>
</li>
</ul>
</li>
</ul>
CSS：
a {
color: #3bb3a9;
}
#nav {
padding: 2px 4px 0;
line-height: 100%;
background:#3bb3a9; /* for non-css3 browsers */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#3bb3a9', endColorstr='#3bb3a9'); /* for IE */
background: -webkit-gradient(linear, left top, left bottom, from(#3bb3a9), to(#3bb3a9)); /* for webkit browsers */
background: -moz-linear-gradient(top, #3bb3a9, #3bb3a9); /* for firefox 3.6+ */
border: solid 1px #329c92;
}
#nav li {
margin: 0 10px;
padding: 0 0 5px;
float: left;
position: relative;
list-style: none;
}
/* main level link */
#nav a {
font-weight: bold;
color: white;
text-decoration: none;
display: block;
padding: 4px 10px;
margin: 0;
-webkit-border-radius: 1.6em;
-moz-border-radius: 1.6em;
}
/* main level link hover */
#nav .current > a, #nav li:hover > a {
background:#329c92; /* for non-css3 browsers */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#329c92', endColorstr='#329c92'); /* for IE */
background: -webkit-gradient(linear, left top, left bottom, from(#329c92), to(#329c92)); /* for webkit browsers */
background: -moz-linear-gradient(top,#329c92, #329c92); /* for firefox 3.6+ */
color: white;
}
/* sub levels link hover */
#nav ul li:hover a, #nav li:hover li a {
background: none;
border: none;
color: white;
-webkit-box-shadow: none;
-moz-box-shadow: none;
cursor:pointer;
}
#nav ul a:hover {
background: #329c92 !important; /* for non-css3 browsers */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#329c92', endColorstr='#329c92'); /* for IE */
background: -webkit-gradient(linear, left top, right bottom, from(#329c92), to(#329c92)) !important; /* for webkit browsers */
background: -moz-linear-gradient(top, #329c92, #329c92) !important; /* for firefox 3.6+ */
color: white !important;
-webkit-border-radius: 0;
-moz-border-radius: 0;
}
/* level 2 list */
#nav ul {
background: #3bb3a9; /* for non-css3 browsers */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#3bb3a9', endColorstr='#3bb3a9'); /* for IE */
background: -webkit-gradient(linear, left top, left bottom, from(#3bb3a9), to(#3bb3a9)); /* for webkit browsers */
background: -moz-linear-gradient(top, #3bb3a9, #3bb3a9); /* for firefox 3.6+ */
display: none;
margin: 0;
padding: 0;
width: 185px;
position: absolute;
top: 27px;
left: 0;
border: solid 1px #3bb3a9;
-webkit-border-radius: 2px;
-moz-border-radius: 2px;
border-radius: 2px;
}
/* dropdown */
#nav li:hover > ul {
display: block;
}
#nav li ul.stayopen {
display: block !important;
}
#nav li ul.stayopen li a {
color: white;
}
#nav ul li {
float: none;
margin: 0;
padding: 0;
}
#nav ul a {
font-weight: normal;
}
/* level 3+ list */
#nav ul ul {
left: 181px;
top: -3px;
}
/* rounded corners for first and last child */
#nav ul li:first-child > a {
-webkit-border-top-left-radius: 9px;
-moz-border-radius-topleft: 9px;
-webkit-border-top-right-radius: 9px;
-moz-border-radius-topright: 9px;
}
#nav ul li:last-child > a {
-webkit-border-bottom-left-radius: 9px;
-moz-border-radius-bottomleft: 9px;
-webkit-border-bottom-right-radius: 9px;
-moz-border-radius-bottomright: 9px;
}
/* clearfix */
#nav:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
#nav {
}
html[xmlns] #nav {
display: block;
}
* html #nav {
height: 1%;
}
請嘗試添加位置：relative; z-index：9999;在#nav –
我曾嘗試不工作。 – user3593694
我已經等待了。答案我會發布它 – user3593694